Climate averages 1991–2020
Siegen weather
in January.
A cold, wet month: the coolest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in Siegen: daytime highs average 3.2°C and nights cool to about -1.4°C. By daytime temperature it is the coolest month of the year.
Expect about 100 mm of rain on roughly 15 days, which makes January a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 8 h 29 min on an average January day.
The nearest other city in this atlas is Lüdenscheid (47 km away). In January its highs average 3.0°C, about as warm as Siegen, with 103 mm of rain.
Among the 120 cities listed in Germany, Siegen ranks joint 107th of 120 for the warmest January highs and 115th of 120 for the driest January (rainfall, lowest first). The mean January high of those 120 cities is 4.2°C; Siegen is 1.0°C cooler than that mean.
From January to February, average highs rise by 1.1°C to 4.3°C, and monthly rainfall falls from 100 mm to 79 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
Siegen climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 3.2°C-1.4°C | -1.4°C | 100 | 14.6 | 8.58 h |
| February | 4.3°C-1.6°C | -1.6°C | 79 | 12.1 | 10.010 h |
| March | 8.3°C1.0°C | 1.0°C | 82 | 13.7 | 11.812 h |
| April | 13.1°C4.4°C | 4.4°C | 62 | 11.7 | 13.814 h |
| May | 16.9°C8.4°C | 8.4°C | 72 | 12.6 | 15.515 h |
| June | 19.9°C11.5°C | 11.5°C | 76 | 12.8 | 16.416 h |
| July | 21.9°C13.7°C | 13.7°C | 83 | 14.2 | 16.016 h |
| August | 21.6°C13.5°C | 13.5°C | 81 | 13.0 | 14.615 h |
| September | 17.6°C10.4°C | 10.4°C | 76 | 11.6 | 12.713 h |
| October | 12.7°C6.8°C | 6.8°C | 80 | 12.9 | 10.811 h |
| November | 7.4°C3.0°C | 3.0°C | 85 | 13.4 | 9.09 h |
| December | 4.0°C0.0°C | 0.0°C | 109 | 15.8 | 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
- Lüdenscheid in JanuaryGermany · 47 kmHigh 3.0°C · Low -1.5°C · 103 mm rain
- Marburg an der Lahn in JanuaryGermany · 53 kmHigh 3.4°C · Low -1.2°C · 58 mm rain
- Gießen in JanuaryGermany · 56 kmHigh 4.0°C · Low -0.6°C · 56 mm rain
- Arnsberg in JanuaryGermany · 57 kmHigh 3.4°C · Low -1.1°C · 79 mm rain
- Iserlohn in JanuaryGermany · 60 kmHigh 3.7°C · Low -0.7°C · 81 mm rain
- Troisdorf in JanuaryGermany · 62 kmHigh 5.2°C · Low 0.6°C · 77 mm rain
- Bergisch Gladbach in JanuaryGermany · 64 kmHigh 4.9°C · Low 0.3°C · 109 mm rain
- Koblenz in JanuaryGermany · 66 kmHigh 4.9°C · Low 0.3°C · 51 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 Siegen) is explained once on the Siegen year overview and on the Sources, method and limits page.