Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
December
Weather in December
Temperature
The commencement of December indicates a gentle shift in the average high-temperature, receding from November's 4.5°C (40.1°F) to a still icy 1.1°C (34°F). Illoinen registers an average low-temperature of -2.2°C (28°F) throughout December, a modest decrease from its daytime highs.Humidity
The average relative humidity in December is 87%.Rainfall
In December, the rain falls for 11.1 days. Throughout December, 41mm (1.61") of precipitation is accumulated. Throughout the year, there are 134.6 rainfall days, and 394mm (15.51") of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Illoinen. In Illoinen, in December, during 12.4 snowfall days, 82mm (3.23") of snow is typically accumulated. In Illoinen, during the entire year, snow falls for 60.5 days and aggregates up to 454mm (17.87") of snow.Daylight
December has the shortest days of the year, with an average of 5h and 54min of daylight.On the first day of the month, sunrise is at 09:10 and sunset at 15:30. On the last day of December, sunrise is at 09:37 and sunset at 15:31 EET.
Sunshine
With an average of 1.9h of sunshine, December has the least sunshine of the year in Illoinen.UV index
January through March, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Illoinen. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for average individuals.Note: In December, the maximum UV index of 1 suggests this advice:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Illoinen?
What is the average humidity in December in Illoinen?
How much does it rain in Illoinen in December?
How much does it snow in Illoinen in December?
What is the month with the shortest days in Illoinen?
How many hours of daylight does Illoinen have in December?
When are sunrise and sunset in December in Illoinen?
What is the month with the least sunshine in Illoinen?
How many hours of sunshine does Illoinen have in December?
When is the lowest UV index in Illoinen?
What is the UV index intensity in December in Illoinen?
Average temperature in December
Illoinen, Finland
- Average high temperature in December: 1.1°C
The warmest month (with the highest average high temperature) is July (20.4°C).
The month with the lowest average high temperature is January (-1.9°C).
- Average low temperature in December: -2.2°C
The months with the highest average low temperature are July and August (13.8°C).
The coldest month (with the lowest average low temperature) is February (-5.6°C).
Average pressure in December
Illoinen, Finland
- Average pressure in December: 1007.6mbar
The month with the highest atmospheric pressure is May (1014.9mbar).
The month with the lowest atmospheric pressure is December (1007.6mbar).
Average wind speed in December
Illoinen, Finland
- Average wind speed in December: 20.4km/h
The windiest month (with the highest average wind speed) is December (20.4km/h).
The calmest month (with the lowest average wind speed) is July (13.9km/h).
Average humidity in December
Illoinen, Finland
- Average humidity in December: 87%
The month with the highest relative humidity is February (91%).
The month with the lowest relative humidity is May (71%).
Average rainfall in December
Illoinen, Finland
- Average rainfall in December: 41mm
The wettest month (with the highest rainfall) is July (49mm).
The driest month (with the least rainfall) is April (19mm).
Average rainfall days in December
Illoinen, Finland
- Average rainfall days in December: 11.1 days
The month with the highest number of rainy days is July (15.1 days).
The month with the least rainy days is February (5.2 days).
Average snowfall in December
Illoinen, Finland
- Average snowfall in December: 82mm
The month with the highest snowfall is January (103mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in December
Illoinen, Finland
- Average snowfall days in December: 12.4 days
The month with the highest number of snowfall days is January (13.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Illoinen, Finland
- Average daylight in December: 5h and 5min
The month with the longest days is June (Average daylight: 18h and 54min).
The month with the shortest days is December (Average daylight: 5h and 54min).
- Average sunshine in December: 1h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is December (Average sunshine: 1h and 54min).
Average sunshine days in December
Illoinen, Finland
- Average sunshine days in December: 9.6 days
The month with the most sunshine days is May (17.2 days).
The month with the least sunshine days is December (9.6 days).
Average UV index in December
Illoinen, Finland
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in December
Illoinen, Finland
- Average cloud cover in December: 71
The month with the most cloud cover is December (Cloud cover 71).
The months with the least cloud cover are July and August (Cloud cover 36).
Average visibility in December
Illoinen, Finland
- Average visibility in December: 9km
The months with the highest visibility are May, June, July, August and September (10km).
The months with the lowest visibility are February and March (8km).
