Average Weather in Ilomantsi Finland
In Ilomantsi, the summers are comfortable and partly cloudy and the winters are long, freezing, snowy, and overcast. Over the course of the year, the temperature typically varies from 7°F to 70°F and is rarely below -15°F or above 80°F.
Based on the tourism score, the best time of year to visit Ilomantsi for warm-weather activities is from late June to early August.
The warm season lasts for 3.0 months, from May 29 to August 31, with an average daily high temperature above 60°F. The hottest day of the year is July 22, with an average high of 70°F and low of 52°F.
The cold season lasts for 3.7 months, from November 23 to March 14, with an average daily high temperature below 29°F. The coldest day of the year is February 3, with an average low of 7°F and high of 19°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
Eagle River, Alaska, United States (3,874 miles away); Forestville, Canada (3,599 miles); and Yelizovo, Russia (3,946 miles) are the far-away foreign places with temperatures most similar to Ilomantsi (view comparison).
In Ilomantsi, 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 Ilomantsi begins around April 21 and lasts for 5.0 months, ending around September 21. On July 19, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 53% of the time, and overcast or mostly cloudy 47% of the time.
The cloudier part of the year begins around September 21 and lasts for 7.0 months, ending around April 21. On December 17, the cloudiest day of the year, the sky is overcast or mostly cloudy 87% of the time, and clear, mostly clear, or partly cloudy 13% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Ilomantsi varies throughout the year.
The wetter season lasts 7.1 months, from May 12 to December 16, with a greater than 27% chance of a given day being a wet day. The chance of a wet day peaks at 38% on July 30.
The drier season lasts 4.9 months, from December 16 to May 12. The smallest chance of a wet day is 17% on February 23.
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 Ilomantsi changes throughout the year.
Rain alone is the most common for 7.6 months, from April 1 to November 19. The highest chance of a day with rain alone is 38% on July 30.
Snow alone is the most common for 4.4 months, from November 19 to April 1. The highest chance of a day with snow alone is 21% on January 23.
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. Ilomantsi experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 8.3 months, from March 30 to December 9, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around August 10, with an average total accumulation of 3.2 inches.
The rainless period of the year lasts for 3.7 months, from December 9 to March 30. The least rain falls around February 11, with an average total accumulation of 0.1 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. Ilomantsi experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 7.3 months, from October 5 to May 14, 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 7, with an average total liquid-equivalent accumulation of 1.0 inches.
The snowless period of the year lasts for 4.7 months, from May 14 to October 5. The least snow falls around July 24, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Ilomantsi varies extremely over the course of the year. In 2021, the shortest day is December 21, with 4 hours, 52 minutes of daylight; the longest day is June 21, with 20 hours, 7 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 2:54 AM on June 19, and the latest sunrise is 6 hours, 35 minutes later at 9:29 AM on December 25. The earliest sunset is at 2:19 PM on December 17, and the latest sunset is 8 hours, 42 minutes later at 11:01 PM on June 22.
Daylight saving time (DST) is observed in Ilomantsi during 2021, starting in the spring on March 28, lasting 7.1 months, and ending in the fall on October 31.
Sunrise & Sunset with Twilight and Daylight Saving Time
The figure below presents a compact representation of key lunar data for 2021. 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. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.
Moon Rise, Set & Phases
The perceived humidity level in Ilomantsi, 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
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Ilomantsi experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 5.3 months, from November 9 to April 20, with average wind speeds of more than 5.9 miles per hour. The windiest day of the year is January 24, with an average hourly wind speed of 7.2 miles per hour.
The calmer time of year lasts for 6.7 months, from April 20 to November 9. The calmest day of the year is July 28, with an average hourly wind speed of 4.7 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Ilomantsi varies throughout the year.
The wind is most often from the west for 3.0 weeks, from May 22 to June 12, with a peak percentage of 31% on June 4. The wind is most often from the south for 11 months, from June 12 to May 22, with a peak percentage of 35% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Ilomantsi 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 Ilomantsi for general outdoor tourist activities is from late June to early 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 Ilomantsi for hot-weather activities is for the entire month of July, 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.
The growing season in Ilomantsi typically lasts for 3.4 months (103 days), from around May 31 to around September 10, rarely starting before May 11 or after June 21, and rarely ending before August 21 or after October 3.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Ilomantsi should appear around May 28, only rarely appearing before May 17 or after June 10.
Growing Degree Days
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 3.0 months, from May 9 to August 8, with an average daily incident shortwave energy per square meter above 4.7 kWh. The brightest day of the year is June 29, with an average of 5.9 kWh.
The darker period of the year lasts for 4.8 months, from October 6 to February 28, with an average daily incident shortwave energy per square meter below 1.2 kWh. The darkest day of the year is December 21, with an average of 0.1 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Ilomantsi are 62.672 deg latitude, 30.933 deg longitude, and 515 ft elevation.
The topography within 2 miles of Ilomantsi contains only modest variations in elevation, with a maximum elevation change of 157 feet and an average elevation above sea level of 503 feet. Within 10 miles also contains only modest variations in elevation (322 feet). Within 50 miles contains only modest variations in elevation (938 feet).
The area within 2 miles of Ilomantsi is covered by trees (50%), artificial surfaces (21%), and water (19%), within 10 miles by trees (73%) and herbaceous vegetation (13%), and within 50 miles by trees (79%) and water (14%).
This report illustrates the typical weather in Ilomantsi, 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 is only a single weather station, Joensuu Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Ilomantsi.
At a distance of 68 kilometers from Ilomantsi, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and Ilomantsi according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
Time zones for airports and weather stations are provided by AskGeo.com .