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
As November makes way for December, Sysmä's average high-temperature eases from an icy 1.8°C (35.2°F) to a freezing cold -2°C (28.4°F). Sysmä observes a slightly reduced average nighttime temperature of -5.2°C (22.6°F) during December.Humidity
In December, the average relative humidity is 93%.Rainfall
In Sysmä, during December, the rain falls for 7.3 days and regularly aggregates up to 38mm (1.5") of precipitation. Throughout the year, there are 125.3 rainfall days, and 390mm (15.35") of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. December is the month with the most snowfall. Snow falls for 20 days and accumulates 202mm (7.95") of snow.Daylight
With an average of 5h and 30min of daylight, December has the shortest days of the year in Sysmä, Finland.On the first day of the month, sunrise is at 09:06 and sunset at 15:06. On the last day of December, in Sysmä, Finland, sunrise is at 09:34 and sunset at 15:06 EET.
Sunshine
December has the least sunshine of the year, with an average of 0.9h 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. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the average person.Note: A maximum daily UV index of 1 during December morphs into the following directions:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Frequently asked questions
How cold is December in Sysmä?
What is the average humidity in December in Sysmä?
How much does it rain in Sysmä in December?
When does it snow the most in Sysmä?
How much does it snow in Sysmä in December?
What is the month with the shortest days in Sysmä?
How many hours of daylight does Sysmä have in December?
What time are sunrise and sunset in December in Sysmä?
What is the month with the least sunshine in Sysmä?
How long on average sun shines in December in Sysmä?
When is the lowest UV index in Sysmä?
What is the UV index reading in December in Sysmä?
Average temperature in December
Sysmä, Finland
- Average high temperature in December: -2°C
The warmest month (with the highest average high temperature) is July (21.3°C).
The month with the lowest average high temperature is January (-4.9°C).
- Average low temperature in December: -5.2°C
The month with the highest average low temperature is July (12.3°C).
The coldest month (with the lowest average low temperature) is January (-9.2°C).
Average pressure in December
Sysmä, Finland
- Average pressure in December: 1007.8mbar
The month with the highest atmospheric pressure is May (1014.6mbar).
The month with the lowest atmospheric pressure is December (1007.8mbar).
Average wind speed in December
Sysmä, Finland
- Average wind speed in December: 13.1km/h
The windiest month (with the highest average wind speed) is December (13.1km/h).
The calmest month (with the lowest average wind speed) is July (9.9km/h).
Average humidity in December
Sysmä, 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
Sysmä, Finland
- Average rainfall in December: 38mm
The wettest month (with the highest rainfall) is July (45mm).
The driest month (with the least rainfall) is April (24mm).
Average rainfall days in December
Sysmä, Finland
- Average rainfall days in December: 7.3 days
The month with the highest number of rainy days is July (16.1 days).
The month with the least rainy days is February (3.5 days).
Average snowfall in December
Sysmä, Finland
- Average snowfall in December: 202mm
The month with the highest snowfall is December (202mm).
The months with the least snowfall are July and August (0mm).
Average snowfall days in December
Sysmä, Finland
- Average snowfall days in December: 20 days
The month with the highest number of snowfall days is January (20.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Sysmä, Finland
- Average daylight in December: 5h and 3min
The month with the longest days is June (Average daylight: 19h and 18min).
The month with the shortest days is December (Average daylight: 5h and 30min).
- Average sunshine in December: 0h and 5min
The month with the most sunshine is June (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 0h and 54min).
Average sunshine days in December
Sysmä, Finland
- Average sunshine days in December: 8.4 days
The month with the most sunshine days is May (17.5 days).
The month with the least sunshine days is December (8.4 days).
Average UV index in December
Sysmä, Finland
- Average UV index in December: 1
The month with the highest UV index is 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
Sysmä, Finland
- Average cloud cover in December: 79
The month with the most cloud cover is January (Cloud cover 82).
The month with the least cloud cover is August (Cloud cover 43).
Average visibility in December
Sysmä, Finland
- Average visibility in December: 7km
The months with the highest visibility are May, June, July and August (9km).
The months with the lowest visibility are January and February (5km).
Sysmä, Finland
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