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
Riihimäki's weather subtly changes with the onset of December, barely falling from an icy 2.9°C (37.2°F) in November to a subzero cold -0.8°C (30.6°F). Riihimäki maintains a consistent average nighttime low-temperature of -4.3°C (24.3°F) throughout December.Humidity
In Riihimäki, Finland, the average relative humidity in December is 93%.Rainfall
December is the month with the most rainfall. Rain falls for 9.5 days and accumulates 44mm (1.73") of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Riihimäki, Finland, in December, snow falls for 19.8 days, with typically accumulated 210mm (8.27") of snow. In Riihimäki, during the entire year, snow falls for 102.9 days and aggregates up to 1059mm (41.69") of snow.Daylight
With an average of 5h and 48min of daylight, December has the shortest days of the year in Riihimäki, Finland.On the first day of December in Riihimäki, sunrise is at 09:02 and sunset at 15:17. On the last day of the month, sunrise is at 09:30 and sunset at 15:17 EET.
Sunshine
December has the least sunshine of the year in Riihimäki, with an average of 1.5h 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 estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, the maximum UV index of 1 transforms into these recommendations:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Frequently asked questions
How cold is it in Riihimäki in December?
What is the average humidity in December in Riihimäki?
What is the wettest month in Riihimäki?
How many days does it rain in December in Riihimäki?
How many days does it snow in December in Riihimäki?
What is the month with the shortest days in Riihimäki?
What is the average length of the day in December in Riihimäki?
When is the sunrise / sunset in December in Riihimäki?
What is the month with the least sunshine in Riihimäki?
How long on average sun shines in December in Riihimäki?
What are the months with the lowest UV index in Riihimäki?
What is the UV index intensity in December in Riihimäki?
Average temperature in December
Riihimäki, 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
Riihimäki, 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
Riihimäki, 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
Riihimäki, 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
Riihimäki, Finland
- Average rainfall in December: 44mm
The wettest month (with the highest rainfall) is December (44mm).
The driest month (with the least rainfall) is August (18mm).
Average rainfall days in December
Riihimäki, Finland
- Average rainfall days in December: 9.5 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
Riihimäki, 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
Riihimäki, 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
Riihimäki, 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 3min
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 30min).
Average sunshine days in December
Riihimäki, 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
Riihimäki, 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
Riihimäki, 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
Riihimäki, 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).
Riihimäki, Finland
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