Climate averages 1991–2020
Hamm weather
in December.
A cold, moderately wet month: the 11th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Hamm: daytime highs average 5.4°C and nights cool to about 1.2°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 73 mm of rain on roughly 13 days, which makes December a moderately wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 7 h 54 min on an average December day.
The nearest other city in this atlas is Lünen (21 km away). In December its highs average 5.6°C, about as warm as Hamm, with 87 mm of rain.
Among the 120 cities listed in Germany, Hamm ranks joint 36th of 120 for the warmest December highs and joint 58th of 120 for the driest December (rainfall, lowest first). The mean December high of those 120 cities is 4.9°C; Hamm is 0.5°C warmer than that mean.
From December to January, average highs fall by 0.6°C to 4.7°C, and monthly rainfall falls from 73 mm to 70 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
Hamm climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.7°C0.2°C | 0.2°C | 70 | 13.6 | 8.48 h |
| February | 5.9°C0.2°C | 0.2°C | 57 | 11.6 | 9.910 h |
| March | 9.5°C2.1°C | 2.1°C | 60 | 12.5 | 11.812 h |
| April | 13.8°C4.9°C | 4.9°C | 48 | 10.6 | 13.814 h |
| May | 17.7°C8.9°C | 8.9°C | 57 | 11.4 | 15.616 h |
| June | 20.6°C12.1°C | 12.1°C | 63 | 11.2 | 16.617 h |
| July | 22.7°C14.4°C | 14.4°C | 72 | 12.9 | 16.216 h |
| August | 22.5°C14.3°C | 14.3°C | 75 | 12.2 | 14.615 h |
| September | 18.7°C11.3°C | 11.3°C | 63 | 11.0 | 12.713 h |
| October | 13.9°C7.9°C | 7.9°C | 65 | 11.8 | 10.711 h |
| November | 8.8°C4.0°C | 4.0°C | 66 | 12.8 | 8.99 h |
| December, selected | 5.4°C1.2°C | 1.2°C | 73 | 13.4 | 7.98 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
- Lünen in DecemberGermany · 21 kmHigh 5.6°C · Low 1.4°C · 87 mm rain
- Dortmund in DecemberGermany · 31 kmHigh 5.3°C · Low 1.2°C · 87 mm rain
- Münster in DecemberGermany · 34 kmHigh 5.3°C · Low 1.3°C · 71 mm rain
- Iserlohn in DecemberGermany · 35 kmHigh 4.4°C · Low 0.5°C · 85 mm rain
- Arnsberg in DecemberGermany · 38 kmHigh 4.2°C · Low 0.2°C · 81 mm rain
- Castrop-Rauxel in DecemberGermany · 38 kmHigh 5.5°C · Low 1.3°C · 89 mm rain
- Witten in DecemberGermany · 42 kmHigh 5.3°C · Low 1.4°C · 89 mm rain
- Hagen in DecemberGermany · 43 kmHigh 5.4°C · Low 1.4°C · 112 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 Hamm) is explained once on the Hamm year overview and on the Sources, method and limits page.