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 onset of December aligns with a soft reduction in the average high-temperature, gently falling from a cold 4.5°C (40.1°F) in November to a still wintry 1.1°C (34°F). Throughout December, Itäharju reports a steady low-temperature average of -2.2°C (28°F), slightly lower than its daytime counterpart.Humidity
The average relative humidity in December is 87%.Rainfall
In December, in Itäharju, the rain falls for 11.1 days. Throughout December, 41mm (1.61") of precipitation is accumulated. In Itäharju, during the entire year, the rain falls for 134.6 days and collects up to 394mm (15.51") of precipitation.Snowfall
Months with snowfall in Itäharju are January through May, October through December. In Itäharju, during December, snow falls for 12.4 days and regularly aggregates up to 82mm (3.23") of snow. Throughout the year, in Itäharju, there are 60.5 snowfall days, and 454mm (17.87") of snow is accumulated.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 15:29. On the last day of December, sunrise is at 09:37 and sunset at 15:30 EET.
Sunshine
The month with the least sunshine is December, with an average of 1.9h of sunshine.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: An average maximum UV index of 1 in December leads to these recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. During bright days, sunglasses that offer UVA and UVB defense are recommended. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When is the sunrise / sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Itäharju have in December?
When is the lowest UV index in Itäharju?
How high is the UV index in December?
Average temperature in December
Itäharju, 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
Itäharju, 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
Itäharju, 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
Itäharju, 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
Itäharju, 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
Itäharju, 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
Itäharju, 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
Itäharju, 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
Itäharju, 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
Itäharju, 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
Itäharju, 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
Itäharju, 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
Itäharju, 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).
