Climate averages 1991–2020
Thornhill weather
in March.
A cold, moderately wet month: the 9th warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
March is a cold month in Thornhill: daytime highs average 3.8°C and nights cool to about -4.6°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 57 mm of rain on roughly 10 days, which makes March a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 54 min on an average March day.
The nearest other city in this atlas is Richmond Hill (6 km away). In March its highs average 3.8°C, about as warm as Thornhill, with 57 mm of rain.
Among the 86 cities listed in Canada, Thornhill ranks joint 37th of 86 for the warmest March highs and joint 18th of 86 for the driest March (rainfall, lowest first). The mean March high of those 86 cities is 3.8°C; Thornhill is level with that mean.
From March to April, average highs rise by 6.5°C to 10.2°C, and monthly rainfall rises from 57 mm to 77 mm.
The annual picture
March in context
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
Thornhill climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -1.4°C-8.6°C | -8.6°C | 60 | 10.2 | 9.39 h |
| February | -0.8°C-9.2°C | -9.2°C | 49 | 7.9 | 10.410 h |
| March, selected | 3.8°C-4.6°C | -4.6°C | 57 | 9.5 | 11.912 h |
| April | 10.2°C1.8°C | 1.8°C | 77 | 10.7 | 13.413 h |
| May | 16.9°C8.2°C | 8.2°C | 72 | 10.1 | 14.715 h |
| June | 22.4°C14.2°C | 14.2°C | 77 | 10.6 | 15.415 h |
| July | 25.5°C17.5°C | 17.5°C | 71 | 9.6 | 15.115 h |
| August | 24.8°C17.2°C | 17.2°C | 65 | 8.8 | 14.014 h |
| September | 21.0°C13.7°C | 13.7°C | 69 | 8.7 | 12.613 h |
| October | 14.0°C7.5°C | 7.5°C | 75 | 10.5 | 11.111 h |
| November | 7.1°C1.4°C | 1.4°C | 67 | 10.0 | 9.710 h |
| December | 1.7°C-4.0°C | -4.0°C | 61 | 10.0 | 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
March in nearby cities
- Richmond Hill in MarchCanada · 6 kmHigh 3.8°C · Low -5.3°C · 57 mm rain
- Vaughan in MarchCanada · 6 kmHigh 3.9°C · Low -5.1°C · 57 mm rain
- Toronto in MarchCanada · 12 kmHigh 3.3°C · Low -4.3°C · 57 mm rain
- Markham in MarchCanada · 14 kmHigh 3.9°C · Low -4.8°C · 68 mm rain
- Etobicoke in MarchCanada · 22 kmHigh 3.9°C · Low -4.2°C · 57 mm rain
- Pickering in MarchCanada · 25 kmHigh 2.9°C · Low -5.1°C · 59 mm rain
- Newmarket in MarchCanada · 26 kmHigh 3.7°C · Low -6.0°C · 56 mm rain
- Brampton in MarchCanada · 31 kmHigh 4.3°C · Low -5.3°C · 57 mm rain
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 limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Thornhill) is explained once on the Thornhill year overview and on the Sources, method and limits page.
Toronto, Etobicoke and Vaughan lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.