Climate averages 1991–2020
Iserlohn weather
in April.
A cool, moderately wet month: the joint 6th warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a cool month in Iserlohn: daytime highs average 12.8°C and nights cool to about 4.4°C. By daytime temperature it is the joint 6th warmest of the 12 months.
Expect about 55 mm of rain on roughly 11 days, which makes April a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 49 min on an average April day.
The nearest other city in this atlas is Hagen (16 km away). In April its highs average 13.8°C, 1.0°C warmer than Iserlohn, with 70 mm of rain.
Among the 120 cities listed in Germany, Iserlohn ranks joint 109th of 120 for the warmest April highs and joint 91st of 120 for the driest April (rainfall, lowest first). The mean April high of those 120 cities is 14.0°C; Iserlohn is 1.2°C cooler than that mean.
From April to May, average highs rise by 3.8°C to 16.5°C, and monthly rainfall rises from 55 mm to 67 mm.
The annual picture
April 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, selected | 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
April in nearby cities
- Hagen in AprilGermany · 16 kmHigh 13.8°C · Low 5.4°C · 70 mm rain
- Lüdenscheid in AprilGermany · 18 kmHigh 12.0°C · Low 3.7°C · 68 mm rain
- Dortmund in AprilGermany · 23 kmHigh 13.9°C · Low 5.1°C · 57 mm rain
- Witten in AprilGermany · 25 kmHigh 13.8°C · Low 5.3°C · 55 mm rain
- Arnsberg in AprilGermany · 26 kmHigh 12.6°C · Low 4.0°C · 56 mm rain
- Lünen in AprilGermany · 29 kmHigh 14.1°C · Low 5.2°C · 57 mm rain
- Castrop-Rauxel in AprilGermany · 34 kmHigh 14.0°C · Low 5.1°C · 55 mm rain
- Hamm in AprilGermany · 35 kmHigh 13.8°C · Low 4.9°C · 48 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.