Climate averages 1991–2020
Aachen weather
in December.
A cold, moderately wet month: the 11th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Aachen: daytime highs average 5.6°C and nights cool to about 1.5°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 wettest month of the year). Daylight, from sunrise to sunset, lasts about 8 h 03 min on an average December day.
The nearest other city in this atlas is Heerlen (14 km away). In December its highs average 5.9°C, about as warm as Aachen, with 72 mm of rain.
Among the 120 cities listed in Germany, Aachen ranks joint 21st 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; Aachen is 0.7°C warmer than that mean.
From December to January, average highs fall by 0.7°C to 4.9°C, and monthly rainfall falls from 85 mm to 74 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
Aachen climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.9°C0.4°C | 0.4°C | 74 | 13.8 | 8.59 h |
| February | 6.0°C0.4°C | 0.4°C | 68 | 12.6 | 10.010 h |
| March | 9.5°C2.3°C | 2.3°C | 70 | 13.7 | 11.812 h |
| April | 13.5°C4.9°C | 4.9°C | 55 | 11.6 | 13.814 h |
| May | 17.2°C8.8°C | 8.8°C | 66 | 12.9 | 15.515 h |
| June | 20.1°C11.8°C | 11.8°C | 76 | 13.1 | 16.416 h |
| July | 22.1°C14.1°C | 14.1°C | 83 | 13.7 | 16.016 h |
| August | 22.0°C14.0°C | 14.0°C | 79 | 12.9 | 14.515 h |
| September | 18.4°C11.2°C | 11.2°C | 66 | 10.9 | 12.713 h |
| October | 13.9°C8.1°C | 8.1°C | 65 | 11.8 | 10.811 h |
| November | 8.9°C4.3°C | 4.3°C | 69 | 13.1 | 9.09 h |
| December, selected | 5.6°C1.5°C | 1.5°C | 85 | 14.5 | 8.18 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
- Heerlen in DecemberThe Netherlands · 14 kmHigh 5.9°C · Low 1.7°C · 72 mm rain
- Maastricht in DecemberThe Netherlands · 29 kmHigh 6.2°C · Low 2.0°C · 87 mm rain
- Düren in DecemberGermany · 29 kmHigh 5.7°C · Low 1.4°C · 73 mm rain
- Liège in DecemberBelgium · 40 kmHigh 6.3°C · Low 2.1°C · 82 mm rain
- Mönchengladbach in DecemberGermany · 52 kmHigh 6.0°C · Low 1.8°C · 79 mm rain
- Hasselt in DecemberBelgium · 55 kmHigh 6.3°C · Low 2.0°C · 77 mm rain
- Viersen in DecemberGermany · 57 kmHigh 6.0°C · Low 1.8°C · 79 mm rain
- Neuss in DecemberGermany · 63 kmHigh 6.0°C · Low 1.7°C · 89 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 Aachen) is explained once on the Aachen year overview and on the Sources, method and limits page.