Average Weather in Viljandi Estonia
In Viljandi, the summers are comfortable and partly cloudy and the winters are long, freezing, dry, windy, and overcast. Over the course of the year, the temperature typically varies from 17°F to 73°F and is rarely below -5°F or above 83°F.
Based on the tourism score, the best time of year to visit Viljandi for warm-weather activities is from late June to mid August.
The warm season lasts for 3.4 months, from May 24 to September 4, with an average daily high temperature above 64°F. The hottest day of the year is July 24, with an average high of 73°F and low of 53°F.
The cold season lasts for 3.9 months, from November 20 to March 16, with an average daily high temperature below 36°F. The coldest day of the year is February 5, with an average low of 17°F and high of 27°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. 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.
Average Hourly Temperature
Haines, Alaska, United States (4,251 miles away); Nelson, Canada (4,698 miles); and Gambo, Canada (3,143 miles) are the far-away foreign places with temperatures most similar to Viljandi (view comparison).
In Viljandi, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Viljandi begins around April 15 and lasts for 5.6 months, ending around October 3. On July 18, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 57% of the time, and overcast or mostly cloudy 43% of the time.
The cloudier part of the year begins around October 3 and lasts for 6.4 months, ending around April 15. On January 23, the cloudiest day of the year, the sky is overcast or mostly cloudy 78% of the time, and clear, mostly clear, or partly cloudy 22% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Viljandi varies throughout the year.
The wetter season lasts 7.1 months, from May 31 to January 3, with a greater than 27% chance of a given day being a wet day. The chance of a wet day peaks at 34% on June 26.
The drier season lasts 4.9 months, from January 3 to May 31. The smallest chance of a wet day is 19% on February 28.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation in Viljandi changes throughout the year.
Rain alone is the most common for 11 months, from February 8 to January 15. The highest chance of a day with rain alone is 34% on June 26.
Snow alone is the most common for 3.4 weeks, from January 15 to February 8. The highest chance of a day with snow alone is 11% on December 25.
Daily Chance of Precipitation
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. Viljandi experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Viljandi. The most rain falls during the 31 days centered around June 23, with an average total accumulation of 2.6 inches.
The least rain falls around February 15, with an average total accumulation of 0.5 inches.
Average Monthly Rainfall
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Viljandi experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 6.0 months, from October 19 to April 20, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 26, with an average total liquid-equivalent accumulation of 0.6 inches.
The snowless period of the year lasts for 6.0 months, from April 20 to October 19. The least snow falls around July 20, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Viljandi varies extremely over the course of the year. In 2017, the shortest day is December 21, with 6 hours, 21 minutes of daylight; the longest day is June 21, with 18 hours, 18 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 4:10 AM on June 18, and the latest sunrise is 4 hours, 57 minutes later at 9:06 AM on December 27. The earliest sunset is at 3:25 PM on December 15, and the latest sunset is 7 hours, 4 minutes later at 10:28 PM on June 23.
Daylight saving time (DST) is observed in Viljandi during 2017, starting in the spring on March 26, lasting 7.1 months, and ending in the fall on October 29.
Sunrise & Sunset with Twilight and Daylight Saving Time
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. 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 perceived humidity level in Viljandi, 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 1% of 1% throughout.
Humidity Comfort Levels
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. 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.
The average hourly wind speed in Viljandi experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 5.7 months, from October 4 to March 27, with average wind speeds of more than 10.8 miles per hour. The windiest day of the year is January 24, with an average hourly wind speed of 12.7 miles per hour.
The calmer time of year lasts for 6.3 months, from March 27 to October 4. The calmest day of the year is July 20, with an average hourly wind speed of 8.9 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Viljandi varies throughout the year.
The wind is most often from the south for 2.1 months, from January 26 to March 29 and for 2.7 months, from October 6 to December 27, with a peak percentage of 41% on November 25. The wind is most often from the west for 6.3 months, from March 29 to October 6 and for 4.3 weeks, from December 27 to January 26, with a peak percentage of 41% on July 8.
Viljandi is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average water temperature experiences significant seasonal variation over the course of the year.
The time of year with warmer water lasts for 2.7 months, from June 27 to September 18, with an average temperature above 58°F. The day of the year with the warmest water is August 8, with an average temperature of 65°F.
The time of year with cooler water lasts for 4.3 months, from December 15 to April 25, with an average temperature below 39°F. The day of the year with the coolest water is February 26, with an average temperature of 32°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Viljandi throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Viljandi for general outdoor tourist activities is from late June to mid August, with a peak score in the third week of July.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Viljandi for hot-weather activities is from mid July to early August, with a peak score in the third week of July.
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. 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.
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.
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.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
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 (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
The growing season in Viljandi typically lasts for 4.6 months (143 days), from around May 10 to around September 30, rarely starting before April 21 or after May 28, and rarely ending before September 7 or after October 23.
Time Spent in Various Temperature Bands and the Growing Season
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. In this report, we use a base of 50°F and a cap of 86°F.
Based on growing degree days alone, the first spring blooms in Viljandi should appear around May 11, only rarely appearing before May 2 or after May 25.
Growing Degree Days
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. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.2 months, from May 4 to August 11, with an average daily incident shortwave energy per square meter above 5.0 kWh. The brightest day of the year is July 3, with an average of 6.2 kWh.
The darker period of the year lasts for 4.3 months, from October 15 to February 24, with an average daily incident shortwave energy per square meter below 1.4 kWh. The darkest day of the year is December 21, with an average of 0.2 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Viljandi are 58.364 deg latitude, 25.590 deg longitude, and 256 ft elevation.
The topography within 2 miles of Viljandi contains only modest variations in elevation, with a maximum elevation change of 213 feet and an average elevation above sea level of 247 feet. Within 10 miles also contains only modest variations in elevation (364 feet). Within 50 miles contains only modest variations in elevation (745 feet).
The area within 2 miles of Viljandi is covered by artificial surfaces (39%), cropland (32%), and trees (15%), within 10 miles by trees (50%) and cropland (39%), and within 50 miles by trees (55%) and cropland (28%).
This report illustrates the typical weather in Viljandi, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Viljandi.
For each station, the records are corrected for the elevation difference between that station and Viljandi according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Viljandi is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Viljandi and a given station.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
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 . 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.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. 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.
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.