Fredericton weather by month
Fredericton runs from about -6°C in January to 21°C in July, with March the wettest month at 213 mm.
warmest month
July
21°C
coolest month
January
-6°C
wettest month
March
213 mm
worst air month
July
10 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | -6°C | 71 mm | 188 h | 4 |
| February | -5°C | 55 mm | 195 h | 4 |
| March | 0°C | 213 mm | 159 h | 6 |
| April | 5°C | 78 mm | 263 h | 5 |
| May | 13°C | 57 mm | 289 h | 5 |
| June | 18°C | 137 mm | 302 h | 6 |
| July | 21°C | 81 mm | 319 h | 10 |
| August | 20°C | 126 mm | 309 h | 8 |
| September | 16°C | 48 mm | 271 h | 5 |
| October | 10°C | 68 mm | 226 h | 3 |
| November | 4°C | 108 mm | 130 h | 3 |
| December | -4°C | 98 mm | 165 h | 3 |
About 2,816 hours of sun a year. Roughly 116 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 2026-05-24. Full method, licences and the list of sources we rejected are on the methodology page.