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
With the onset of December, Mäntsälä's average high-temperature slightly adjusts, moderately receding from November's wintry 2.9°C (37.2°F) to a freezing cold -0.8°C (30.6°F). The temperature in Mäntsälä during December experiences a small drop from daytime peaks, recording an average of -4.3°C (24.3°F) at night.Humidity
In December, the average relative humidity is 93%.Rainfall
The month with the most rainfall is December, when the rain falls for 9.6 days and typically aggregates up to 44mm (1.73") of precipitation.Snowfall
January through May, October through December are months with snowfall. In Mäntsälä, during December, snow falls for 19.8 days and regularly aggregates up to 210mm (8.27") of snow. Throughout the year, there are 102.9 snowfall days, and 1059mm (41.69") of snow is accumulated.Daylight
With an average of 5h and 48min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 08:59 and sunset at 15:15. On the last day of the month, sunrise is at 09:27 and sunset at 15:16 EET.
Sunshine
December has the least sunshine of the year, with an average of 1.7h 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. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.Note: In December, a regular UV index of 1 translates into these guidelines:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
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?
What is the rainiest month in Mäntsälä?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December in Mäntsälä?
What time are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Mäntsälä have in December?
What are the months with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Mäntsälä, Finland
- Average high temperature in December: -0.8°C
The warmest month (with the highest average high temperature) is July (22.2°C).
The month with the lowest average high temperature is January (-3.8°C).
- Average low temperature in December: -4.3°C
The month with the highest average low temperature is July (12.4°C).
The coldest month (with the lowest average low temperature) is January (-8.3°C).
Average pressure in December
Mäntsälä, Finland
- Average pressure in December: 1008.3mbar
The month with the highest atmospheric pressure is May (1014.9mbar).
The month with the lowest atmospheric pressure is December (1008.3mbar).
Average wind speed in December
Mäntsälä, Finland
- Average wind speed in December: 11.4km/h
The windiest month (with the highest average wind speed) is December (11.4km/h).
The calmest month (with the lowest average wind speed) is August (9.1km/h).
Average humidity in December
Mäntsälä, Finland
- Average humidity in December: 93%
The month with the highest relative humidity is February (95%).
The month with the lowest relative humidity is May (67%).
Average rainfall in December
Mäntsälä, Finland
- Average rainfall in December: 44mm
The wettest month (with the highest rainfall) is December (44mm).
The driest months (with the least rainfall) are August and September (18mm).
Average rainfall days in December
Mäntsälä, Finland
- Average rainfall days in December: 9.6 days
The month with the highest number of rainy days is November (13.5 days).
The month with the least rainy days is February (4.2 days).
Average snowfall in December
Mäntsälä, Finland
- Average snowfall in December: 210mm
The month with the highest snowfall is February (229mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in December
Mäntsälä, Finland
- Average snowfall days in December: 19.8 days
The month with the highest number of snowfall days is January (22.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Mäntsälä, Finland
- Average daylight in December: 5h and 5min
The month with the longest days is June (Average daylight: 19h and 0min).
The month with the shortest days is December (Average daylight: 5h and 48min).
- Average sunshine in December: 1h and 4min
The month with the most sunshine is June (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 1h and 42min).
Average sunshine days in December
Mäntsälä, Finland
- Average sunshine days in December: 6.6 days
The month with the most sunshine days is June (20.8 days).
The month with the least sunshine days is February (6.5 days).
Average UV index in December
Mäntsälä, Finland
- Average UV index in December: 1
The months with the highest UV index are June and July (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
Mäntsälä, Finland
- Average cloud cover in December: 77
The months with the most cloud cover are January and February (Cloud cover 78).
The month with the least cloud cover is August (Cloud cover 42).
Average visibility in December
Mäntsälä, Finland
- Average visibility in December: 6km
The months with the highest visibility are May, June and July (9km).
The months with the lowest visibility are January and February (5km).
