December weather forecastHeidelberg, Germany
December
Weather in December
In December, winter is in full throttle in Heidelberg. The city, swirling under the snowfall, echoes with holiday festivity and twinkling lights. After a couple of months of steady temperature fall, December brings a winter wonder with snowfall increasing significantly. The coldest time of the day sees the mercury dipping to 1.1°C (34°F), and the city receives a generous snowfall of 44mm (1.73"). As winter scenery takes a final bow, Heidelberg turns into a magical city, celebrating the season and preparing to welcome another climatic cycle with January.Temperature
December witnesses a gentle descent in average high-temperature, descending from November's frosty 9.1°C (48.4°F) to a wintry 5.5°C (41.9°F). Heidelberg, during the December nights, maintains an average temperature of 1.1°C (34°F), closely aligned with its daytime readings.Humidity
In Heidelberg, the average relative humidity in December is 85%.Rainfall
In Heidelberg, Germany, in December, it is raining for 14.9 days, with typically 49mm (1.93") of accumulated precipitation. In Heidelberg, during the entire year, the rain falls for 164.2 days and collects up to 434mm (17.09") of precipitation.Snowfall
January through March, October through December are months with snowfall in Heidelberg. December is the month with the most snowfall in Heidelberg. Snow falls for 4.2 days and accumulates 44mm (1.73") of snow.Daylight
With an average of 8h and 18min of daylight, December has the shortest days of the year in Heidelberg.On the first day of December in Heidelberg, sunrise is at 08:00 and sunset at 16:28. On the last day of the month, sunrise is at 08:20 and sunset at 16:36 CET.
Sunshine
December has the least sunshine of the year, with an average of 4.1h of sunshine.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: In December, the UV index of 2 transforms into the following advice:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Heidelberg, Germany
- Average high temperature in December: 5.5°C
The warmest month (with the highest average high temperature) is August (25.8°C).
The month with the lowest average high temperature is January (4°C).
- Average low temperature in December: 1.1°C
The month with the highest average low temperature is August (15.3°C).
The coldest month (with the lowest average low temperature) is January (-0.3°C).
Average pressure in December
Heidelberg, Germany
- Average pressure in December: 1019.1mbar
The month with the highest atmospheric pressure is December (1019.1mbar).
The month with the lowest atmospheric pressure is November (1015mbar).
Average wind speed in December
Heidelberg, Germany
- Average wind speed in December: 12.1km/h
The windiest month (with the highest average wind speed) is February (12.3km/h).
The calmest month (with the lowest average wind speed) is August (8.7km/h).
Average humidity in December
Heidelberg, Germany
- Average humidity in December: 85%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are July and August (67%).
Average rainfall in December
Heidelberg, Germany
- Average rainfall in December: 49mm
The wettest month (with the highest rainfall) is May (50mm).
The driest month (with the least rainfall) is April (19mm).
Average rainfall days in December
Heidelberg, Germany
- Average rainfall days in December: 14.9 days
The month with the highest number of rainy days is July (16.4 days).
The month with the least rainy days is September (10.8 days).
Average snowfall in December
Heidelberg, Germany
- Average snowfall in December: 44mm
The month with the highest snowfall is December (44mm).
The months with the least snowfall are April, May, June, July, August and September (0mm).
Average snowfall days in December
Heidelberg, Germany
- Average snowfall days in December: 4.2 days
The month with the highest number of snowfall days is January (5.4 days).
The months with the least snowfall days are April, May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Heidelberg, Germany
- Average daylight in December: 8h and 18min
The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in December: 4h and 6min
The months with the most sunshine are July and August (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).
Average sunshine days in December
Heidelberg, Germany
- Average sunshine days in December: 11.5 days
The month with the most sunshine days is September (17.3 days).
The month with the least sunshine days is December (11.5 days).
Average UV index in December
Heidelberg, Germany
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Heidelberg, Germany
- Average cloud cover in December: 59
The month with the most cloud cover is December (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Heidelberg, Germany
- 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).
