Climate averages 1991–2020
Groningen weather
by month.
See how the year changes. July (tied with August) has the highest average daily maximum; April has the lowest average monthly rainfall.
Long-term climate patterns, not a forecast for a particular trip.
Across the year Groningen averages a daytime high of 12.9°C and a nighttime low of 6.9°C, with about 764 mm of rain on roughly 146 days. July (tied with August) is the warmest month (average high 20.9°C) and January the coolest (4.9°C). July is the wettest month with 87 mm; April is the driest with 48 mm.
The annual picture
A year in Groningen
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
Groningen climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.9°C0.8°C | 0.8°C | 63 | 12.6 | 8.18 h |
| February | 5.7°C0.7°C | 0.7°C | 49 | 10.5 | 9.810 h |
| March | 8.7°C2.3°C | 2.3°C | 49 | 10.9 | 11.812 h |
| April | 12.7°C5.0°C | 5.0°C | 48 | 10.7 | 13.914 h |
| May | 16.2°C8.7°C | 8.7°C | 60 | 11.8 | 15.816 h |
| June | 18.8°C11.6°C | 11.6°C | 74 | 12.2 | 16.917 h |
| July | 20.9°C14.0°C | 14.0°C | 87 | 14.3 | 16.416 h |
| August | 20.9°C14.1°C | 14.1°C | 83 | 14.0 | 14.815 h |
| September | 17.8°C11.7°C | 11.7°C | 68 | 12.1 | 12.713 h |
| October | 13.4°C8.1°C | 8.1°C | 63 | 12.5 | 10.611 h |
| November | 8.7°C4.5°C | 4.5°C | 57 | 12.2 | 8.79 h |
| December | 5.6°C1.7°C | 1.7°C | 63 | 12.4 | 7.68 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
Nearby cities
- LeeuwardenThe Netherlands · 50 kmHigh 12.6°C · Low 7.7°C · 775 mm rain a year
- ZwolleThe Netherlands · 85 kmHigh 13.5°C · Low 6.9°C · 783 mm rain a year
- AlmeloThe Netherlands · 96 kmHigh 13.7°C · Low 6.7°C · 780 mm rain a year
- HengeloThe Netherlands · 107 kmHigh 13.7°C · Low 6.8°C · 780 mm rain a year
- LelystadThe Netherlands · 108 kmHigh 13.3°C · Low 7.7°C · 857 mm rain a year
- WilhelmshavenGermany · 108 kmHigh 12.9°C · Low 6.8°C · 764 mm rain a year
- OldenburgGermany · 110 kmHigh 13.2°C · Low 6.8°C · 790 mm rain a year
- DeventerThe Netherlands · 111 kmHigh 13.6°C · Low 6.9°C · 762 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC+1, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 53.20°, 6.60° (3 km from the city centre), adjusted down by 0.1°C for the difference between the city's elevation (16 m) and the cell's (-1 m). Rain comes from the 0.25° cell at 53.25°, 6.50°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.