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 signifies a minor drop in average high-temperature, transitioning from a wintry 4.3°C (39.7°F) in November to a still icy 0.8°C (33.4°F). Helilä navigates through December with a barely noticeable decrease in temperature at night, stabilizing at a subzero cold -2.1°C (28.2°F).Humidity
The average relative humidity in December in Helilä is 87%.Rainfall
In Helilä, during December, the rain falls for 10.4 days and regularly aggregates up to 55mm (2.17") of precipitation. Throughout the year, in Helilä, there are 158.3 rainfall days, and 569mm (22.4") of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Helilä, during December, snow falls for 15.7 days and regularly aggregates up to 141mm (5.55") of snow. In Helilä, during the entire year, snow falls for 85.1 days and aggregates up to 670mm (26.38") of snow.Daylight
The month with the shortest days is December, with an average of 5h and 54min of daylight.On the first day of December in Helilä, sunrise is at 08:52 and sunset at 15:10. On the last day of the month, sunrise is at 09:19 and sunset at 15:11 EET.
Sunshine
With an average of 1.7h of sunshine, December has the least sunshine of the year.UV index
January through March, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Helilä, Finland. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, a regular UV index of 1 translates into these guidelines:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Helilä?
What is the average humidity in December in Helilä?
How much does it rain in Helilä in December?
How much does it snow in Helilä in December?
What is the month with the shortest days in Helilä?
What is the average length of the day in December in Helilä?
When is the sunrise / sunset in December in Helilä?
What is the month with the least sunshine in Helilä?
How long on average sun shines in December in Helilä?
What is the month with the lowest UV index in Helilä?
What is the UV index intensity in December in Helilä?
Average temperature in December
Helilä, Finland
- Average high temperature in December: 0.8°C
The warmest month (with the highest average high temperature) is July (19.7°C).
The month with the lowest average high temperature is February (-2.7°C).
- Average low temperature in December: -2.1°C
The month with the highest average low temperature is July (15.1°C).
The coldest month (with the lowest average low temperature) is February (-6.3°C).
Average pressure in December
Helilä, Finland
- Average pressure in December: 1008.9mbar
The month with the highest atmospheric pressure is May (1014.9mbar).
The month with the lowest atmospheric pressure is December (1008.9mbar).
Average wind speed in December
Helilä, Finland
- Average wind speed in December: 23.7km/h
The windiest month (with the highest average wind speed) is December (23.7km/h).
The calmest month (with the lowest average wind speed) is July (15.5km/h).
Average humidity in December
Helilä, Finland
- Average humidity in December: 87%
The month with the highest relative humidity is February (92%).
The month with the lowest relative humidity is May (73%).
Average rainfall in December
Helilä, Finland
- Average rainfall in December: 55mm
The wettest month (with the highest rainfall) is August (67mm).
The driest month (with the least rainfall) is April (29mm).
Average rainfall days in December
Helilä, Finland
- Average rainfall days in December: 10.4 days
The month with the highest number of rainy days is October (17.6 days).
The month with the least rainy days is February (5.6 days).
Average snowfall in December
Helilä, Finland
- Average snowfall in December: 141mm
The month with the highest snowfall is January (148mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in December
Helilä, Finland
- Average snowfall days in December: 15.7 days
The month with the highest number of snowfall days is January (18.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Helilä, 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 4min
The month with the most sunshine is June (Average sunshine: 12h and 30min).
The month with the least sunshine is December (Average sunshine: 1h and 42min).
Average sunshine days in December
Helilä, Finland
- Average sunshine days in December: 6.4 days
The month with the most sunshine days is May (15.2 days).
The month with the least sunshine days is December (6.4 days).
Average UV index in December
Helilä, 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
Helilä, Finland
- Average cloud cover in December: 77
The months with the most cloud cover are January and December (Cloud cover 77).
The months with the least cloud cover are July and August (Cloud cover 37).
Average visibility in December
Helilä, Finland
- Average visibility in December: 8km
The months with the highest visibility are May, June, July, August and September (10km).
The months with the lowest visibility are January, February, March and December (8km).
Helilä, Finland
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