Hannover weather by month
Hannover runs from about 3°C in January to 20°C in August, with February the wettest month at 114 mm.
warmest month
August
20°C
coolest month
January
3°C
wettest month
February
114 mm
worst air month
January
14 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | 3°C | 64 mm | 114 h | 14 |
| February | 7°C | 114 mm | 100 h | 13 |
| March | 8°C | 45 mm | 217 h | 14 |
| April | 11°C | 97 mm | 251 h | 8 |
| May | 16°C | 60 mm | 374 h | 7 |
| June | 17°C | 71 mm | 351 h | 7 |
| July | 19°C | 92 mm | 361 h | 6 |
| August | 20°C | 35 mm | 342 h | 7 |
| September | 16°C | 77 mm | 287 h | 7 |
| October | 12°C | 65 mm | 187 h | 7 |
| November | 6°C | 58 mm | 104 h | 11 |
| December | 5°C | 60 mm | 61 h | 12 |
About 2,749 hours of sun a year. Roughly 85 rainy days a year.
These are long-run climate normals, not a forecast. A given year can sit well outside them. PM2.5 is a global model: near the coast it counts sea salt as fine particulate and reads high against ground stations, sometimes by a factor of two. Use the shape of the year, not the absolute number.
where these numbers come from
- · Temperature, rainfall and sunshine: ECMWF ERA5 reanalysis climate normals via Open-Meteo (CC BY 4.0), fetched once and stored.
- · PM2.5: Copernicus CAMS reanalysis, monthly means. Modelled, not station readings; near coasts CAMS counts sea salt as PM2.5 and reads high.
Last reviewed 2026-05-25. Full method, licences and the list of sources we rejected are on the methodology page.