Climate averages 1991–2020
Iserlohn weather
in January.
A cold, moderately wet month: the coolest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in Iserlohn: daytime highs average 3.7°C and nights cool to about -0.7°C. By daytime temperature it is the coolest month of the year.
Expect about 81 mm of rain on roughly 15 days, which makes January a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 8 h 25 min on an average January day.
The nearest other city in this atlas is Hagen (16 km away). In January its highs average 4.6°C, 1.0°C warmer than Iserlohn, with 108 mm of rain.
Among the 120 cities listed in Germany, Iserlohn ranks joint 77th of 120 for the warmest January highs and joint 100th of 120 for the driest January (rainfall, lowest first). The mean January high of those 120 cities is 4.2°C; Iserlohn is 0.5°C cooler than that mean.
From January to February, average highs rise by 1.0°C to 4.7°C, and monthly rainfall falls from 81 mm to 67 mm.
The annual picture
January 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, selected | 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 | 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
January in nearby cities
- Hagen in JanuaryGermany · 16 kmHigh 4.6°C · Low 0.3°C · 108 mm rain
- Lüdenscheid in JanuaryGermany · 18 kmHigh 3.0°C · Low -1.5°C · 103 mm rain
- Dortmund in JanuaryGermany · 23 kmHigh 4.7°C · Low 0.1°C · 83 mm rain
- Witten in JanuaryGermany · 25 kmHigh 4.6°C · Low 0.3°C · 83 mm rain
- Arnsberg in JanuaryGermany · 26 kmHigh 3.4°C · Low -1.1°C · 79 mm rain
- Lünen in JanuaryGermany · 29 kmHigh 5.0°C · Low 0.4°C · 83 mm rain
- Castrop-Rauxel in JanuaryGermany · 34 kmHigh 4.9°C · Low 0.3°C · 83 mm rain
- Hamm in JanuaryGermany · 35 kmHigh 4.7°C · Low 0.2°C · 70 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.