Climate averages 1991–2020
Hamilton weather
by month.
See how the year changes. July has the highest average daily maximum; February has the lowest average monthly precipitation.
Long-term climate patterns, not a forecast for a particular trip.
Across the year Hamilton averages a daytime high of 12.6°C and a nighttime low of 6.0°C, with about 918 mm of rain on roughly 124 days. July is the warmest month (average high 26.2°C) and January the coolest (-0.6°C). April is the wettest month with 94 mm; February is the driest with 57 mm.
The annual picture
A year in Hamilton
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Hamilton climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -0.6°C-7.0°C | -7.0°C | 71 | 11.3 | 9.49 h |
| February | -0.3°C-7.5°C | -7.5°C | 57 | 8.6 | 10.510 h |
| March | 3.8°C-3.4°C | -3.4°C | 69 | 9.9 | 11.912 h |
| April | 9.8°C2.7°C | 2.7°C | 94 | 11.4 | 13.413 h |
| May | 17.0°C9.6°C | 9.6°C | 83 | 11.2 | 14.715 h |
| June | 22.9°C15.9°C | 15.9°C | 86 | 11.5 | 15.315 h |
| July | 26.2°C19.1°C | 19.1°C | 77 | 10.0 | 15.015 h |
| August | 25.4°C18.7°C | 18.7°C | 69 | 9.4 | 14.014 h |
| September | 21.6°C15.1°C | 15.1°C | 77 | 9.3 | 12.513 h |
| October | 14.6°C8.9°C | 8.9°C | 85 | 11.0 | 11.111 h |
| November | 7.7°C2.7°C | 2.7°C | 79 | 10.3 | 9.810 h |
| December | 2.5°C-2.5°C | -2.5°C | 71 | 10.6 | 9.09 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
Nearby cities
- Stoney CreekCanada · 8 kmHigh 13.4°C · Low 5.2°C · 918 mm rain a year
- BurlingtonCanada · 15 kmHigh 12.5°C · Low 5.2°C · 887 mm rain a year
- OakvilleCanada · 26 kmHigh 12.5°C · Low 5.6°C · 887 mm rain a year
- MiltonCanada · 30 kmHigh 12.7°C · Low 4.7°C · 866 mm precipitation a year
- BrantfordCanada · 36 kmHigh 13.0°C · Low 4.4°C · 897 mm precipitation a year
- Cambridge, CanadaCanada · 39 kmHigh 12.5°C · Low 3.6°C · 897 mm precipitation a year
- MississaugaCanada · 40 kmHigh 12.5°C · Low 4.5°C · 887 mm precipitation a year
- GuelphCanada · 46 kmHigh 12.0°C · Low 3.2°C · 902 mm precipitation a year
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC-5, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 43.30°, -79.80° (7 km from the city centre), adjusted up by 0.2°C for the difference between the city's elevation (95 m) and the cell's (129 m). Rain comes from the 0.25° cell at 43.25°, -79.75°. Stoney Creek lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.