Climate averages 1991–2020
Ulm weather
in December.
A cold, moderately wet month: the 11th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Ulm: daytime highs average 3.9°C and nights cool to about -1.5°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 68 mm of rain on roughly 13 days, which makes December a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 8 h 24 min on an average December day.
The nearest other city in this atlas is Reutlingen (59 km away). In December its highs average 4.9°C, 1.0°C warmer than Ulm, with 75 mm of rain.
Among the 120 cities listed in Germany, Ulm ranks joint 108th of 120 for the warmest December highs and joint 45th of 120 for the driest December (rainfall, lowest first). The mean December high of those 120 cities is 4.9°C; Ulm is 1.0°C cooler than that mean.
From December to January, average highs fall by 0.5°C to 3.4°C, and monthly rainfall falls from 68 mm to 61 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Ulm climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.4°C-2.7°C | -2.7°C | 61 | 11.7 | 8.89 h |
| February | 4.9°C-2.8°C | -2.8°C | 51 | 10.4 | 10.210 h |
| March | 9.2°C0.4°C | 0.4°C | 66 | 12.4 | 11.912 h |
| April | 13.7°C3.9°C | 3.9°C | 62 | 11.3 | 13.614 h |
| May | 17.6°C8.3°C | 8.3°C | 95 | 14.4 | 15.215 h |
| June | 20.9°C11.9°C | 11.9°C | 96 | 14.5 | 16.016 h |
| July | 22.9°C13.9°C | 13.9°C | 99 | 14.5 | 15.716 h |
| August | 22.9°C13.9°C | 13.9°C | 88 | 13.4 | 14.314 h |
| September | 18.4°C10.0°C | 10.0°C | 69 | 11.3 | 12.613 h |
| October | 13.6°C6.1°C | 6.1°C | 67 | 11.4 | 10.911 h |
| November | 7.6°C1.5°C | 1.5°C | 64 | 10.9 | 9.39 h |
| December, selected | 3.9°C-1.5°C | -1.5°C | 68 | 13.0 | 8.48 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Reutlingen in DecemberGermany · 59 kmHigh 4.9°C · Low -0.7°C · 75 mm rain
- Esslingen in DecemberGermany · 63 kmHigh 5.5°C · Low -0.2°C · 73 mm rain
- Augsburg in DecemberGermany · 67 kmHigh 4.0°C · Low -1.5°C · 71 mm rain
- Tübingen in DecemberGermany · 71 kmHigh 5.0°C · Low -0.7°C · 78 mm rain
- Stuttgart in DecemberGermany · 74 kmHigh 5.5°C · Low -0.2°C · 73 mm rain
- Ludwigsburg in DecemberGermany · 81 kmHigh 4.9°C · Low -0.5°C · 83 mm rain
- Heilbronn in DecemberGermany · 100 kmHigh 5.4°C · Low 0.4°C · 90 mm rain
- Konstanz in DecemberGermany · 102 kmHigh 4.3°C · Low 0.4°C · 85 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Ulm) is explained once on the Ulm year overview and on the Sources, method and limits page.