Detroit weather by month
Detroit runs from about -3°C in January to 23°C in July, with January the wettest month at 131 mm.
warmest month
July
23°C
coolest month
January
-3°C
wettest month
January
131 mm
worst air month
February
16 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | -3°C | 131 mm | 111 h | 9 |
| February | 2°C | 9 mm | 236 h | 16 |
| March | 5°C | 59 mm | 221 h | 11 |
| April | 11°C | 125 mm | 281 h | 10 |
| May | 17°C | 86 mm | 357 h | 9 |
| June | 22°C | 71 mm | 342 h | 9 |
| July | 23°C | 94 mm | 377 h | 14 |
| August | 22°C | 76 mm | 361 h | 13 |
| September | 20°C | 85 mm | 284 h | 11 |
| October | 13°C | 58 mm | 293 h | 7 |
| November | 8°C | 54 mm | 146 h | 8 |
| December | 1°C | 92 mm | 127 h | 10 |
About 3,136 hours of sun a year. Roughly 95 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 2026-05-23. Full method, licences and the list of sources we rejected are on the methodology page.