Climate averages 1991–2020
Iserlohn 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 Iserlohn: daytime highs average 4.4°C and nights cool to about 0.5°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 85 mm of rain on roughly 15 days, which makes December a moderately wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 7 h 57 min on an average December day.
The nearest other city in this atlas is Hagen (16 km away). In December its highs average 5.4°C, 0.9°C warmer than Iserlohn, with 112 mm of rain.
Among the 120 cities listed in Germany, Iserlohn ranks joint 84th of 120 for the warmest December highs and joint 90th of 120 for the driest December (rainfall, lowest first). The mean December high of those 120 cities is 4.9°C; Iserlohn is 0.5°C cooler than that mean.
From December to January, average highs fall by 0.7°C to 3.7°C, and monthly rainfall falls from 85 mm to 81 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
Iserlohn climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.7°C-0.7°C | -0.7°C | 81 | 14.5 | 8.48 h |
| February | 4.7°C-0.8°C | -0.8°C | 67 | 12.4 | 9.910 h |
| March | 8.4°C1.4°C | 1.4°C | 71 | 13.5 | 11.812 h |
| April | 12.8°C4.4°C | 4.4°C | 55 | 11.2 | 13.814 h |
| May | 16.5°C8.3°C | 8.3°C | 67 | 12.6 | 15.616 h |
| June | 19.4°C11.4°C | 11.4°C | 72 | 12.7 | 16.517 h |
| July | 21.4°C13.6°C | 13.6°C | 86 | 14.0 | 16.116 h |
| August | 21.2°C13.5°C | 13.5°C | 84 | 13.1 | 14.615 h |
| September | 17.5°C10.6°C | 10.6°C | 72 | 12.3 | 12.713 h |
| October | 12.8°C7.3°C | 7.3°C | 72 | 12.7 | 10.711 h |
| November | 7.8°C3.4°C | 3.4°C | 75 | 13.7 | 8.99 h |
| December, selected | 4.4°C0.5°C | 0.5°C | 85 | 14.7 | 8.08 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
- Hagen in DecemberGermany · 16 kmHigh 5.4°C · Low 1.4°C · 112 mm rain
- Lüdenscheid in DecemberGermany · 18 kmHigh 3.8°C · Low -0.2°C · 106 mm rain
- Dortmund in DecemberGermany · 23 kmHigh 5.3°C · Low 1.2°C · 87 mm rain
- Witten in DecemberGermany · 25 kmHigh 5.3°C · Low 1.4°C · 89 mm rain
- Arnsberg in DecemberGermany · 26 kmHigh 4.2°C · Low 0.2°C · 81 mm rain
- Lünen in DecemberGermany · 29 kmHigh 5.6°C · Low 1.4°C · 87 mm rain
- Castrop-Rauxel in DecemberGermany · 34 kmHigh 5.5°C · Low 1.3°C · 89 mm rain
- Hamm in DecemberGermany · 35 kmHigh 5.4°C · Low 1.2°C · 73 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 Iserlohn) is explained once on the Iserlohn year overview and on the Sources, method and limits page.