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
Weather in December
Temperature
December is marked by a subtle drop in average high-temperatures, transitioning from a wintry 4.5°C (40.1°F) in November to a still cold 1.1°C (34°F). Night temperatures during December in Iso-Heikkilä, Finland, stabilize at an average of -2.2°C (28°F), closely mirroring the daytime temperatures.Humidity
The average relative humidity in December is 87%.Rainfall
In Iso-Heikkilä, Finland, in December, it is raining for 11.1 days, with typically 41mm (1.61") of accumulated precipitation. 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 Iso-Heikkilä. In Iso-Heikkilä, in December, during 12.4 snowfall days, 82mm (3.23") of snow is typically accumulated. Throughout the year, in Iso-Heikkilä, there are 60.5 snowfall days, and 454mm (17.87") of snow is accumulated.Daylight
The month with the shortest days in Iso-Heikkilä is December, with an average of 5h and 54min of daylight.On the first day of December, sunrise is at 09:10 and sunset at 15:29. On the last day of the month, sunrise is at 09:37 and sunset at 15:30 EET.
Sunshine
December has the least sunshine of the year, with an average of 1.9h of sunshine.UV index
January through March, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Iso-Heikkilä. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 1 in December interprets into the following recommendations:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Enhance your sun protection with tightly woven, yet airy clothing. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Frequently asked questions
How cold is December in Iso-Heikkilä?
What is the average humidity in December in Iso-Heikkilä?
How many days does it rain in December in Iso-Heikkilä?
How much does it snow in Iso-Heikkilä in December?
What is the month with the shortest days in Iso-Heikkilä?
What is the average length of the day in December in Iso-Heikkilä?
What time are sunrise and sunset in December in Iso-Heikkilä?
What is the month with the least sunshine in Iso-Heikkilä?
How many hours of sunshine does Iso-Heikkilä have in December?
When is the lowest UV index in Iso-Heikkilä?
How high is the UV index in December in Iso-Heikkilä?
Average temperature in December
Iso-Heikkilä, 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
Iso-Heikkilä, 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
Iso-Heikkilä, 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
Iso-Heikkilä, 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
Iso-Heikkilä, 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
Iso-Heikkilä, 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
Iso-Heikkilä, 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
Iso-Heikkilä, 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
Iso-Heikkilä, 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
Iso-Heikkilä, 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
Iso-Heikkilä, 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
Iso-Heikkilä, 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
Iso-Heikkilä, 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).
Iso-Heikkilä, Finland
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