Buffalo weather by month
Buffalo runs from about -1°C in January to 22°C in July, with April the wettest month at 185 mm.
warmest month
July
22°C
coolest month
January
-1°C
wettest month
April
185 mm
worst air month
February
12 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | -1°C | 137 mm | 69 h | 6 |
| February | 1°C | 59 mm | 211 h | 12 |
| March | 4°C | 68 mm | 210 h | 9 |
| April | 9°C | 185 mm | 239 h | 8 |
| May | 16°C | 99 mm | 348 h | 7 |
| June | 20°C | 132 mm | 322 h | 7 |
| July | 22°C | 80 mm | 389 h | 11 |
| August | 21°C | 174 mm | 328 h | 12 |
| September | 19°C | 112 mm | 311 h | 9 |
| October | 13°C | 50 mm | 266 h | 5 |
| November | 8°C | 63 mm | 168 h | 5 |
| December | 0°C | 104 mm | 112 h | 6 |
About 2,973 hours of sun a year. Roughly 126 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.