Weather in Postojna: December
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Average day temperature: | 39.7°F |
| Average night temperature: | 33.5°F | |
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Number of sunny days: | 10 days |
| Day length: | 8.7 - 8.9 hours | |
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Number of days with precipitation: | 5 days |
| Precipitation totals: | 3.9 in. | |
| more information | ||
14 days
forecast
forecast
| Postojna |
weather in
January
January
| Postojna |
Air temperature in December, °F
Show year:
2025
2024
2023
The highest day temperature during December of 2025 was 50°F. At the same time the lowest night temperature was 28°F. Daily and nightly averages during December were 43.1°F and 36.9°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 Postojna in December is 4.5 in. Other months of the year show relatively similar values.
Wind speed in December, mph
The average wind speed value in December is 4.8 mph It makes December one of the least 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: 3.2.
Best time for vacation in Postojna
Postojna on a weather map
Places in Slovenia:
Name
°F
24 Hours Forecast
Postojna
Local time: 04:36
December 27, saturday
0600
28°F
SW
5 mph
5 mph
0900
34°F
SW
6 mph
6 mph
1200
41°F
SW
6 mph
6 mph
1500
41°F
SW
4 mph
4 mph
1800
34°F
SW
3 mph
3 mph
2100
34°F
NW
2 mph
2 mph
December 28, sunday
0000
34°F
W
2 mph
2 mph
0300
32°F
W
2 mph
2 mph
