WEATHER · CLIMATE NORMALS · 1991–2020
Halifax Climate — Averages by Month
What the weather in Halifax, CAaverages across a standard 30-year period. Each month's figure is the 1991–2020 mean temperature and total rainfall from the ERA5 reanalysis — the long-run normal a place settles around, not a forecast for any particular day.
Month-by-month normals
| Month | Avg temperature | Avg rainfall |
|---|---|---|
| January | -4.6 °C · coldest | 116.1 mm |
| February | -4.2 °C | 105.6 mm |
| March | -0.6 °C | 112.6 mm |
| April | 4.5 °C | 96.2 mm |
| May | 9.7 °C | 86.4 mm |
| June | 14.6 °C | 100.9 mm |
| July | 18.5 °C | 95.1 mm |
| August | 18.7 °C · warmest | 94.1 mm |
| September | 15.5 °C | 99.8 mm |
| October | 9.9 °C | 127.2 mm |
| November | 4.8 °C | 132.4 mm |
| December | -0.5 °C | 138.7 mm · wettest |
How to read these numbers
These are reanalysis normals, not readings from a single weather station. They come from the ERA5 0.25° (~25 km) global reanalysis grid, sampled at the grid cell nearest Halifax — centred at 44.75°N, 63.50°W. A reanalysis blends observations with a physics model onto an even grid, so a coastal or mountain city's cell can read a little cooler, warmer, wetter or drier than the city centre itself. The month-to-month shape — when it's hot, when it rains — is what these normals capture best.
“Normal” means the 1991–2020 average, the current World Meteorological Organization standard period. A normal is what a place tends toward over decades — any single day, month or year can and will depart from it.