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Weather & Climate
Alliston, Ontario, Canada
Overview
Climate data and monthly weather averages for Alliston.
Key Metrics
Annual Avg
6.9°C
Summer Avg
19.7°C
Winter Avg
-6°C
Record High
35.7°C
Record Low
-28.4°C
Annual Precipitation
789 mm
Avg Humidity
80%
Summer Humidity
69%
Winter Humidity
92%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 11.8° | -7.3° | -25.5° | 56.7 | 93% | 42 | 60.4 |
| Feb | 14.6° | -7.1° | -28.1° | 51.2 | 91% | 61 | 68.2 |
| Mar | 24.2° | -1.9° | -28.4° | 53.6 | 85% | 110 | 67.3 |
| Apr | 24.8° | 4.7° | -16.7° | 70.2 | 80% | 137 | 58.3 |
| May | 31.4° | 11.7° | -4° | 72.9 | 77% | 171 | 53.8 |
| Jun | 34.4° | 17.5° | 2.1° | 72.6 | 73% | 182 | 44.5 |
| Jul | 35.6° | 21.2° | 7.1° | 69.4 | 67% | 189 | 43.5 |
| Aug | 35.7° | 20.5° | 7.7° | 64.5 | 68% | 162 | 41.7 |
| Sep | 34.6° | 16.5° | 2.3° | 66.6 | 72% | 121 | 48.5 |
| Oct | 29.1° | 8.8° | -4.3° | 77.5 | 80% | 74 | 51.3 |
| Nov | 21.7° | 2.2° | -15.3° | 69.9 | 86% | 44 | 63.5 |
| Dec | 14.6° | -3.7° | -21.9° | 63.9 | 91% | 32 | 62.1 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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