The average sea temperature around Helsinki in December is 3°C. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. Järvenpää The day of the year with the coolest water is February 29, with an average temperature of 32Â°F. The highest chance of a day with rain alone is 30% on October 20. The perceived humidity level in Helsinki, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 2% of 2% throughout. The cold season lasts for 3.8 months, from November 25 to March 19, with an average daily high temperature below 36Â°F. Helsinki, Finland - Travel and vacation weather averages, current conditions and forecasts. All Year Climate & Weather Averages in Helsinki. The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands. The time of year with warmer water lasts for 2.6 months, from June 30 to September 17, with an average temperature above 57Â°F. Thus, the mean temperature average on this month of january in Helsinki is 29°F. Hämeenlinna The sea and large lakes slow down the progress of winter. The average summertime temperature is 70 degrees Fahrenheit (21 degrees Celsius). Based on the tourism score, the best time of year to visit Helsinki for warm-weather activities is from late June to mid August. Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies. Tuusula Espoo The black line is the percentage chance that a given day is within the growing season. The darker period of the year lasts for 4.4 months, from October 14 to February 26, with an average daily incident shortwave energy per square meter below 1.4 kWh. The topography within 2 miles of Helsinki contains only modest variations in elevation, with a maximum elevation change of 148 feet and an average elevation above sea level of 36 feet. February is the coldest month, with an average high-temperature of -1.9°C (28.6°F) and an average low-temperature of -7.4°C (18.7°F). Winter (December through February) Weather is far too cold this time of year in Helsinki to be enjoyable for warm weather travelers. Within 50 miles contains only modest variations in elevation (607 feet). Rain may fall as snow in this month. The climate in Helsinki during March can be summarized as cold and dry. We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. Note that these seasonal averages are in contrast with those observed in Helsinki in april with a maximum record of 65°F in 2009 and a minimum record of 23°F in 2012. Nummela For each station, the records are corrected for the elevation difference between that station and Helsinki according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The amount of rain/snow in January is normal with an average of 41mm (1.6in). The average high during this season is between 37.1°F (2.8°C) and 26.7°F (-2.9°C). The stations contributing to this reconstruction are: Helsinki-Malmi Airport (95%, 11 kilometers, northeast) and Tallinn Airport (4.6%, 84 kilometers, south). July is the hottest month in Helsinki with an average temperature of 16.5°C (62°F) and the coldest is February at -5.5°C (22°F). Low Temp: 19 °F. Temperatures are up to 32°F. Rain alone is the most common for 11 months, from February 15 to January 17. The "mean daily maximum" (solid red line) shows the maximum temperature of an average day for every month for Helsinki. On July 17, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 59% of the time, and overcast or mostly cloudy 41% of the time. The snowy period of the year lasts for 5.6 months, from October 28 to April 16, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. How can we not include the ice rink in our things to do in Helsinki in winter list! The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages. Helsinki weather in December is extremely cold with temperatures of (-3°) and 2° degrees, as result gloves and warm clothes are recommended. Helsinki experiences some seasonal variation in monthly liquid-equivalent snowfall. The last month of the winter, February, is another freezing cold month in Helsinki, Finland, with average temperature fluctuating between -7.4°C (18.7°F) and -1.9°C (28.6°F). The length of the day in Helsinki varies extremely over the course of the year. The thin dotted lines are the corresponding average perceived temperatures. The average minimum temperature (usually the minimum temperature is noted during the night) in Helsinki in December is -7.0°C (19.4°F). The smallest chance of a wet day is 17% on February 28. The first month of the winter, December, is also a wintry month, with average temperature ranging between max 0.5°C (32.9°F) and min -4.5°C (23.9°F). On average, the recorded minimum temperature is 25°F. The percentage of time spent at various humidity comfort levels, categorized by dew point. The warm season lasts for 3.0 months, from June 3 to September 3, with an average daily high temperature above 62Â°F. Helsinki has a significant amount of rainfall during the year. This report illustrates the typical weather in Helsinki, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. This section reports on the wide-area average surface temperature of that water. Helsinki experiences some seasonal variation in monthly rainfall. The climate of Helsinki is Baltic, that is, moderately continental, with cold winters, during which the average temperature is a few degrees below freezing, and mild to pleasantly warm summers. Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32Â°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere). Weather in February » Weather on Christmas Eve beginning from 1981. The weather in Helsinki in January is extremely cold, when degrees are between -4 and 0 and there are 19 days of rain and 14 days of snow in average. Therefore, if you are planning a trip to Helsinki in December, warm clothes and gloves are highly recommended. Shortwave radiation includes visible light and ultraviolet radiation. The wind is most often from the south for 2.0 months, from January 27 to March 27 and for 1.3 months, from November 2 to December 10, with a peak percentage of 35% on November 24. The chance of wet days in Helsinki varies throughout the year. Rain falls throughout the year in Helsinki. The transitions to and from daylight saving time are indicated by the 'DST' labels. The city, the capital of Finland, is located on the southern coast, at the 60th parallel. Within 10 miles also contains only modest variations in elevation (253 feet). Likewise, "mean daily minimum" (solid blue line) shows the average minimum temperature. Entrance is €6 per adult and €3 per child (under 18) and its a magical way to spend a couple of hours in the city. The wind is most often from the west for 7.2 months, from March 27 to November 2 and for 1.5 months, from December 10 to January 27, with a peak percentage of 40% on June 2. Does it rain in Helsinki in December? The darkest day of the year is December 20, with an average of 0.2 kWh. The percentage of time spent in various temperature bands. The average water temperature experiences significant seasonal variation over the course of the year. A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. Average November sea temperatures. The closest Ocean of Helsinki is Gulf of Finland, The closest Airports of Helsinki are: Helsinki Airport (HEL) 16.88km,Turku Airport (TKU) 151.46km,Tampere-Härmälä Airport (TMP) 156.87km, You can reach Helsinki from this Cities by Plane: London (STN), Athens (ATH), Ljubljana (LJU), Copenhagen (CPH), New Delhi (DEL), Vienna (VIE), Paris (ORY), Hamburg (HAM), Oslo (OSL), Bremen (BRE), Alacant/Alicante (ALC), Málaga (AGP), Beijing (PEK), Stockholm (ARN), Gothenburg (GOT), Kyiv (KBP), Minsk (MSQ), Gdańsk (GDN), Riga (RIX), Frankfurt am Main (FRA) Thus, the mean temperature average in april in Helsinki is 41°F. The wetter season lasts 7.4 months, from June 13 to January 25, with a greater than 25% chance of a given day being a wet day. The windiest day of the year is December 12, with an average hourly wind speed of 11.3 miles per hour. The least rain falls around February 18, with an average total accumulation of 0.5 inches. In July, the highest average water temperature for this place is reached with on average 18.20°C | 64.76°F. Helsingin pitäjän kirkonkylä The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The shaded overlays indicate night and civil twilight. The calmest day of the year is July 2, with an average hourly wind speed of 7.1 miles per hour. Although Finland is northern country there are no severe frosts even at January. Lower dew points feel drier and higher dew points feel more humid. Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations. The earliest sunset is at 3:11 PM on December 16, and the latest sunset is 7 hours, 39 minutes later at 10:50 PM on June 22. The predominant average hourly wind direction in Helsinki varies throughout the year. We assume no responsibility for any decisions made on the basis of the content presented on this site. November arrives with a chilly daily average of 0°C in Helsinki, Finland. High Temp: 71 °F. The brighter period of the year lasts for 3.1 months, from May 4 to August 9, with an average daily incident shortwave energy per square meter above 5.0 kWh. Tallinn, © Climate-Data.org / AM OP / OpenStreetMap contributors, Helsinki Weather by month // weather averages, Helsinki Climate graph // Weather by Month. Average Weather in Helsinki Finland In Helsinki, the summers are comfortable and partly cloudy and the winters are long, freezing, dry, windy, and mostly cloudy. Here, the temperature remains almost constantly around or below freezing (0 °C or 32 °F) from mid-November to late March. The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands. Daytime maximum temperatures average around a freezing 0°C (32°F), whilst at night -5°C (24°F) is normal. You can expect to have about 4 days with temperatures … The highest chance of a day with snow alone is 10% on January 26. Max: 8.8°C / 47.8°F; Avg: 4.1°C / 39.4°F; Min: -0.6°C / 31°F The cloudier part of the year begins around October 9 and lasts for 6.4 months, ending around April 22. During the year, the average temperatures vary by 22.8 °C | 73.0 °F. Time zones for airports and weather stations are provided by AskGeo.com . The climate in Helsinki during December can be summarized as cold and reasonably dry. It might be daunting for some but there are a lot of opportunities not just to see snow but try out ice sports during this time. The difference in precipitation between the driest month and the wettest month is 45 mm | 2 inch. The clearer part of the year in Helsinki begins around April 22 and lasts for 5.6 months, ending around October 9. Viherkumpu Based on growing degree days alone, the first spring blooms in Helsinki should appear around May 23, only rarely appearing before May 13 or after June 5. It is -5.8 °C | 21.6 °F. Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database . The figure below shows you a compact characterization of the entire year of hourly average temperatures. The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands. With average of -4 °C (25 °F) and plenty of snow Helsinki is as beautiful as it … All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day). Lahti The wettest month is August with an average of 90mm of rain. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed. Over the course of the year, the temperature typically varies from 17°F to 71°F and is rarely below -3°F or above 79°F . Daytime maximum temperatures average around a freezing 1°C (33°F), whilst at night -6°C (22°F) is normal. The average hourly wind speed in Helsinki experiences significant seasonal variation over the course of the year. in Helsinki (Southern Finland), Finland. Average high air temperature in Helsinki in December is 0°C/33°F, and average low air temperature is -5°C/24°F. December weather forecast for Helsinki, Finland. The number of hours during which the Sun is visible (black line). This is true even for the driest month. Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more. The figure below presents a compact representation of key lunar data for 2020. The average minimum temperature (usually the minimum temperature is noted during the night) in Helsinki in January is -10.0°C (14°F). January February March April May June July August September October November December; Avg. Whereas in February the lowest average water temperature is measured at 0.20°C | 32.36°F. The average hourly temperature, color coded into bands. Vantaa The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Helsinki. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Temperature. The best month to swim in the sea is in August when the average sea temperature is 13.°C (55°F). Based on this categorization, the most common form of precipitation in Helsinki changes throughout the year. Like much of the country, Helsinki experiences long summer days and very low sun during the winter. The day of the year with the warmest water is August 4, with an average temperature of 63Â°F. These temperatures are far removed from those records observed in Helsinki in january with a maximum record of 49°F in 2012 and a minimum record of -4°F in 2016. In this report, we use a base of 50Â°F and a cap of 86Â°F. Winter: Novemeber to March is the long and lengthy frosty winter that the city sees. The temperature here averages 5.1 °C | 41.2 °F. The drier season lasts 4.6 months, from January 25 to June 13. The most rain falls during the 31 days centered around October 11, with an average total accumulation of 2.2 inches. We report snowfall in liquid-equivalent terms. As the city prepares for a cold winter, average daily highs reach just above freezing at 2°C, while the average low is as cold as … Our beach/pool temperature score is 0 for perceived temperatures below 65Â°F, rising linearly to 9 for 75Â°F, to 10 for 82Â°F, falling linearly to 9 for 90Â°F, and to 1 for 100Â°F or hotter. The amount of rain/snow in December is normal with an average of 58mm (2.3in). We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. For the purposes of this report, the geographical coordinates of Helsinki are 60.170 deg latitude, 24.935 deg longitude, and 85 ft elevation. January, February, November and December, with an average maximum … Hot days and cold nights (dashed red and blue lines) show the average of the hottest day and coldest night of each month of the last 30 years. The warmest sea in Helsinki in December is 6.8°C/44.2°F, and the coldest sea temperature in December is 0.4°C/32.7°F. All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus. From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night. Based on this score, the best time of year to visit Helsinki for general outdoor tourist activities is from late June to mid August, with a peak score in the third week of July. First month of winter brings spectacular Northern Lights and about -2 °C (28 °F) of daytime average temperature. The average maximum temperature lies around -1.0°C (30.2°F). The coldest day of the year is February 7, with an average low of 17Â°F and high of 27Â°F. Daylight saving time (DST) is observed in Helsinki during 2020, starting in the spring on March 29, lasting 6.9 months, and ending in the fall on October 25. Kavallinmäki Here Helsinki is representing the weather conditions in Southern Finland, Jyväskylä in Central Finland and Sodankylä in Finnish Lapland. The time of year with cooler water lasts for 4.4 months, from December 16 to April 30, with an average temperature below 38Â°F. On average, it rains or snows a great amount: 7 to 12 times per month. The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night. The weather in Helsinki in December is extremely cold, when degrees are between -3 and 2 and there are 17 days of rain and 11 days of snow in average. Winter is the longest season i… This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid. Therefore, if you are planning a trip to Helsinki in January, warm clothes and gloves are highly recommended. Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. Pisa Over the course of the year, the temperature typically varies from 17Â°F to 71Â°F and is rarely below -3Â°F or above 79Â°F. Hyvinkää Since there are on average 17 rainy days in Helsinki in December and chances for rain are high, it is recommended to take an umbrella with you. Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. December is in the winter in Helsinki and is typically the 4th coldest month of the year. In Helsinki, the summers are comfortable and partly cloudy and the winters are long, freezing, dry, windy, and mostly cloudy. The thin dotted line is the corresponding average liquid-equivalent snowfall. As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. The growing season in Helsinki typically lasts for 4.7 months (146 days), from around May 7 to around September 30, rarely starting before April 18 or after May 25, and rarely ending before September 11 or after October 21. Both temperatures and snow depths vary extensively from Christmas to Christmas. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands. The solar day over the course of the year 2020. In Helsinki, the annual water temperature (Gulf of Finland) is on average 7.90°C | 46.22°F. Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory. Snow alone is the most common for 4.1 weeks, from January 17 to February 15. support@__remove_this_part__weatherspark.com. Helsinki Weather averages for holidays in 2020/2021. In 2020, the shortest day is December 21, with 5 hours, 49 minutes of daylight; the longest day is June 21, with 18 hours, 56 minutes of daylight. The brightest day of the year is July 1, with an average of 6.3 kWh. The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader. In winter, the mean temperature remains below 0°C, but warm airflows can raise the daily high above 0°C at times. This climate is considered to be Dfb according to the Köppen-Geiger climate classification. The hottest day of the year is July 21, with an average high of 71Â°F and low of 55Â°F. Get the monthly weather forecast for Helsinki, Uusimaa, Finland, including daily high/low, historical averages, to help you plan ahead. Helsinki, Southern Finland, Finland - Monthly weather averages including average high and low Temperature, Precipitation, Pressure, Wind Charts to assist you in planning your travel, holiday or an outdoor activity at Helsinki, Finland To characterize how pleasant the weather is in Helsinki throughout the year, we compute two travel scores. Temperature (°C)-5.5 -5.8 -2.3 3.3 9.7 14.7 17 15.8 10.7 5.9 0.9 There are usually 22 days with some rain in Helsinki in December and the average monthly rainfall is 58mm. Winter is long and cold throughout the country; it lasts almost five months even in Helsinki, which lies in the far south. Helsinki is located near a large body of water (e.g., ocean, sea, or large lake). The chance of a wet day peaks at 32% on November 20. Approximately around July 29, the highest water temperature of around 18.20°C | 64.76°F is reached during the year. The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The calmer time of year lasts for 6.3 months, from March 6 to September 16. The average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. Weather data is prone to errors, outages, and other defects. The most snow falls during the 31 days centered around January 23, with an average total liquid-equivalent accumulation of 0.6 inches. This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. Check average temperature, sunshine & rainfall plus more to Helsinki, Finland For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Helsinki climate summary The Helsinki lies on 29m above sea level In Helsinki, the climate is cold and temperate. February has the lowest average temperature of the year. The shaded overlays indicate night and civil twilight. The city also experiences a heat island effect, which results in slightly higher temperatures. The driest month is February, with 33 mm | 1.3 inch of rainfall. Click on each chart for more information. The earliest sunrise is at 3:53 AM on June 19, and the latest sunrise is 5 hours, 32 minutes later at 9:25 AM on December 27. With an average of 78 mm | 3.1 inch, the most precipitation falls in August. Every year the Helsinki Icepark is set up in the heart of Helsinki, next door to the central railway station and opposite the Ateneum Museum. March is in the spring in Helsinki and is typically the 3rd coldest month of the year. Whereas around February 25 the lowest average water temperatures are to be expected. The warmest month of the year is July, with an average temperature of 17.0 °C | 62.6 °F. At this time these are at about 0.20°C | 32.36°F. It thus takes about two months for winter to proceed from Lapland to Åland. This month is known to be a cold month. These times of year are fairly slow with tourists. In Helsinki, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year. Weather.com brings you the most accurate monthly weather forecast for with average/record and high/low temperatures, ... Helsinki, Uusimaa, Finland Monthly Weather. Stephenville Crossing, Canada (3,219 miles away) and Haines, Alaska, United States (4,124 miles) are the far-away foreign places with temperatures most similar to Helsinki (view comparison). Our tourism temperature score is 0 for perceived temperatures below 50Â°F, rising linearly to 9 for 65Â°F, to 10 for 75Â°F, falling linearly to 9 for 80Â°F, and to 1 for 90Â°F or hotter. The thin dotted line is the corresponding average rainfall. On December 22nd, the sun rises at 9:25 and sets at 14:15. The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than. MERRA-2 Modern-Era Retrospective Analysis. Porvoo Norrköping (NRK), Yekaterinburg (SVX), Girona (GRO), Rovaniemi (RVN), Burgas (BOJ), Osaka (KIX), New York (JFK), Milan (MXP), Rome (FCO), Budapest (BUD), Barcelona (BCN), Saint Petersburg (LED), Torrejón de Ardoz (MAD), Zurich (ZRH), Berlin (TXL), Xianyang (XIY), Tokyo (NRT), Lisbon (LIS), Amsterdam (AMS), Tel Aviv-Yafo (TLV), Palma de Mallorca (PMI), Izmir (ADB), Antalya (AYT), Singapore (SIN), Tokoname (NGO), Chongqing (CKG), Shanghai (PVG), Dublin (DUB), Split (SPU), Dubrovnik (DBV), Prague (PRG), Bangkok (BKK), Brussels (BRU), Vaasa (VAA), Moscow (DME), Munich (MUC), Kajaani (KAJ), Souda (CHQ), Kittilä (KTT), Hahn (HHN), Nice (NCE), Krakow (KRK), Istanbul (IST), Seoul (ICN), Bergamo (BGY), Reykjavik (KEF), Hong Kong (HKG), Tampere The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day. The area within 2 miles of Helsinki is covered by artificial surfaces (65%) and water (30%), within 10 miles by water (47%) and artificial surfaces (40%), and within 50 miles by water (49%) and trees (32%). The least snow falls around July 29, with an average total liquid-equivalent accumulation of 0.0 inches. The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year. The snowless period of the year lasts for 6.4 months, from April 16 to October 28. The estimated value at Helsinki is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Helsinki and a given station. The windier part of the year lasts for 5.7 months, from September 16 to March 6, with average wind speeds of more than 9.2 miles per hour. The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands. Based on this score, the best time of year to visit Helsinki for hot-weather activities is from mid July to early August, with a peak score in the third week of July. On January 23, the cloudiest day of the year, the sky is overcast or mostly cloudy 75% of the time, and clear, mostly clear, or partly cloudy 25% of the time. To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end. Kirkkonummi Porttipuisto The beach/pool score favors clear, rainless days with perceived temperatures between 75Â°F and 90Â°F.