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
Heerlen's December weather features a light decline in high-temperatures, reducing from a frosty 9.5°C (49.1°F) in November to a cold 5.7°C (42.3°F). Heerlen welcomes an average low temperature of 1.9°C (35.4°F) in December, a gentle shift from the day's high.Humidity
January and December, with an average relative humidity of 87%, are the most humid months.Rainfall
December is the month with the most rainfall in Heerlen, Netherlands. Rain falls for 16 days and accumulates 51mm (2.01") of precipitation.Snowfall
January through March, November and December are months with snowfall. In Heerlen, during December, snow falls for 3.9 days and regularly aggregates up to 39mm (1.54") of snow. Throughout the year, there are 19.8 snowfall days, and 147mm (5.79") of snow is accumulated.Daylight
December has the shortest days of the year in Heerlen, Netherlands, with an average of 8h and 0min of daylight.On the first day of the month, sunrise is at 08:17 and sunset at 16:33. On the last day of December, in Heerlen, sunrise is at 08:38 and sunset at 16:39 CET.
Sunshine
With an average of 3.7h of sunshine, December has the least sunshine of the year.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Heerlen, Netherlands. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the average person.Note: An average maximum UV index of 2 in December leads to these recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is December cold in Heerlen?
What are the most humid months in Heerlen?
What is the average humidity in December in Heerlen?
What is the wettest month in Heerlen?
How much does it rain in Heerlen in December?
How much does it snow in Heerlen in December?
What is the month with the shortest days in Heerlen?
How many hours of daylight does Heerlen have in December?
What time are sunrise and sunset in December in Heerlen?
What is the month with the least sunshine in Heerlen?
How long on average sun shines in December in Heerlen?
What is the month with the lowest UV index in Heerlen?
How high is the UV index in December in Heerlen?
Average temperature in December
Heerlen, Netherlands
- Average high temperature in December: 5.7°C
The warmest months (with the highest average high temperature) are July and August (22.6°C).
The month with the lowest average high temperature is January (4.3°C).
- Average low temperature in December: 1.9°C
The month with the highest average low temperature is August (13.7°C).
The coldest month (with the lowest average low temperature) is January (0.4°C).
Average pressure in December
Heerlen, Netherlands
- Average pressure in December: 1016.7mbar
The month with the highest atmospheric pressure is September (1017.6mbar).
The month with the lowest atmospheric pressure is November (1013.1mbar).
Average wind speed in December
Heerlen, Netherlands
- Average wind speed in December: 17.6km/h
The windiest month (with the highest average wind speed) is December (17.6km/h).
The calmest month (with the lowest average wind speed) is August (11.1km/h).
Average humidity in December
Heerlen, Netherlands
- Average humidity in December: 87%
The months with the highest relative humidity are January and December (87%).
The month with the lowest relative humidity is April (75%).
Average rainfall in December
Heerlen, Netherlands
- Average rainfall in December: 51mm
The wettest month (with the highest rainfall) is December (51mm).
The driest month (with the least rainfall) is April (22mm).
Average rainfall days in December
Heerlen, Netherlands
- Average rainfall days in December: 16 days
The months with the highest number of rainy days are May and July (18 days).
The month with the least rainy days is September (12.2 days).
Average snowfall in December
Heerlen, Netherlands
- Average snowfall in December: 39mm
The month with the highest snowfall is January (48mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in December
Heerlen, Netherlands
- Average snowfall days in December: 3.9 days
The month with the highest number of snowfall days is January (5.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Heerlen, Netherlands
- Average daylight in December: 8h and 0min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 0min).
- Average sunshine in December: 3h and 4min
The month with the most sunshine is August (Average sunshine: 9h and 12min).
The month with the least sunshine is December (Average sunshine: 3h and 42min).
Average sunshine days in December
Heerlen, Netherlands
- Average sunshine days in December: 10.3 days
The months with the most sunshine days are September and October (15.5 days).
The month with the least sunshine days is June (9.8 days).
Average UV index in December
Heerlen, Netherlands
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Heerlen, Netherlands
- Average cloud cover in December: 63
The month with the most cloud cover is December (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 40).
Average visibility in December
Heerlen, Netherlands
- Average visibility in December: 8km
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (9km).
The months with the lowest visibility are January and December (8km).
Heerlen, Netherlands
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