Charlottetown weather by month
Charlottetown runs from about -4°C in January to 21°C in July, with March the wettest month at 168 mm.
warmest month
July
21°C
coolest month
January
-4°C
wettest month
March
168 mm
worst air month
July
9 µg/m³
The whole year, month by month.
| Month | Avg temp | Rain | Sun | PM2.5 |
|---|---|---|---|---|
| January | -4°C | 84 mm | 142 h | 3 |
| February | -3°C | 121 mm | 152 h | 4 |
| March | 1°C | 168 mm | 175 h | 5 |
| April | 4°C | 51 mm | 270 h | 5 |
| May | 10°C | 64 mm | 270 h | 5 |
| June | 16°C | 132 mm | 275 h | 5 |
| July | 21°C | 85 mm | 327 h | 9 |
| August | 20°C | 62 mm | 320 h | 7 |
| September | 16°C | 53 mm | 263 h | 4 |
| October | 11°C | 63 mm | 224 h | 4 |
| November | 6°C | 142 mm | 64 h | 2 |
| December | -1°C | 77 mm | 126 h | 2 |
About 2,608 hours of sun a year. Roughly 109 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 2026-05-27. Full method, licences and the list of sources we rejected are on the methodology page.