Weather in Heidelberg: December
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Average day temperature: | 41.2°F |
| Average night temperature: | 37.0°F | |
 |
Number of sunny days: | 6 days |
| Day length: | 8.2 - 8.5 hours | |
 |
Number of rainy days: | 4 days |
| Precipitation totals: | 2.2 in. | |
| more information | ||
14 days
forecast
forecast
| Heidelberg |
weather in
January
January
| Heidelberg |
Air temperature in December, °F
Show year:
2025
2024
2023
The highest day temperature during December of 2025 was 52°F. At the same time the lowest night temperature was 27°F. Daily and nightly averages during December were 43.0°F and 38.0°F.
Sunny, partly cloudy and cloudy days
Mostly all days in December are cloudy but sunny and partly cloudy days are also possible.
Precipitation total in December, in.
Precipitation total value in Heidelberg in December is 2.2 in. Other months of the year show relatively similar values.
Wind speed in December, mph
The average wind speed value in December is 6.6 mph It makes December one of the most windy months of the year.
Average sunny hours
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in December is: 3.1.
Best time for vacation in Heidelberg
Heidelberg on a weather map
Places in Germany:
Name
°F
24 Hours Forecast
Heidelberg
Local time: 02:28
January 02, friday
0300
34°F
NE
16 mph
16 mph
0600
32°F
NE
15 mph
15 mph
0900
32°F
NE
13 mph
13 mph
1200
34°F
NE
13 mph
13 mph
1500
34°F
NE
16 mph
16 mph
1800
34°F
E
11 mph
11 mph
2100
30°F
E
8 mph
8 mph
January 03, saturday
0000
30°F
NE
7 mph
7 mph
