Ontario has a temperate climate with warm summers and freezing winters.
Ontario has an average annual temperature of 7.6°C across all 191 cities, with approximately 746 mm of annual precipitation and average humidity of 79%. Temperatures peak in July and drop to their lowest in January, while rainfall is highest during summer months.
The warmest city is Acton with average July highs of 33.8°C, while Kenora is the coldest with average January lows of -38.6°C. Humidity remains high throughout the year, especially during winter months, creating cold and damp conditions. These seasonal patterns make summer ideal for outdoor activities, while winters bring freezing conditions and heavy snowfall.
| Month | 🌤️ | High | Low | Avg | Humid % | Rain (mm) | Wind (m/s) | Solar (kWh/m²) |
|---|---|---|---|---|---|---|---|---|
| January | ❄️ | 5.1°C | -21.5°C | -8.2°C | 90% | 49 | 3.6 | 1.40 |
| February | ❄️ | 6.2°C | -20.4°C | -7.1°C | 89% | 42 | 3.7 | 2.20 |
| March | ❄️ | 14.3°C | -15.9°C | -0.8°C | 83% | 48 | 3.3 | 3.50 |
| April | 🌤️ | 20.5°C | -5.9°C | 7.3°C | 78% | 63 | 2.8 | 4.50 |
| May | 🌤️ | 25.9°C | 0.0°C | 12.9°C | 75% | 68 | 2.2 | 5.50 |
| June | ☀️ | 29.4°C | 5.8°C | 17.6°C | 73% | 74 | 2.1 | 6.00 |
| July | ☀️ | 31.2°C | 10.7°C | 21.0°C | 70% | 72 | 2.0 | 6.00 |
| August | ☀️ | 30.9°C | 10.1°C | 20.5°C | 70% | 69 | 2.0 | 5.20 |
| September | ☀️ | 28.9°C | 4.8°C | 16.8°C | 73% | 72 | 2.2 | 4.00 |
| October | 🌤️ | 23.1°C | -1.4°C | 10.9°C | 78% | 70 | 2.5 | 2.50 |
| November | 🌤️ | 15.5°C | -7.4°C | 4.0°C | 83% | 63 | 2.9 | 1.50 |
| December | ❄️ | 7.9°C | -15.8°C | -4.0°C | 88% | 57 | 3.2 | 1.10 |
Showing average climate conditions across 45 years (1981–2025) · averaged across all 191 cities in Ontario
🧥 Pack heavy layers and prepare for snow — this is a Severe Winter destination.
🌤️ Early mornings and evenings are most comfortable during this Hot Summer season.
☔ Rainfall is spread across the year with no sharply defined wet season.
Region-wide monthly averages across 191 cities · 1981–2025 · °C
Temperatures rise steadily from spring, peak in July, and gradually decline through autumn into winter.
These seasonal patterns make summer ideal for outdoor activities, while winters bring freezing conditions and heavy snowfall.
Region-wide monthly rainfall · 1981–2025 · mm/month
Monthly averages · 1981–2025
💧 Humidity peaks at 90% in January · annual avg 79%
The warmest year on record was 2024 (avg: 10.1°C), while the coldest year was 1982 (avg: 5.8°C).
Averaged across all 191 cities in Ontario · Last 10 years · °C
Averaged across all 191 cities in Ontario · Last 10 years · mm/year
🔥 hottest · ❄️ coldest · 🌧️ wettest
ℹ️ Values are averages across all 191 cities in Ontario for each year.
| Year | Min Temp | Avg Temp | Max Temp | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|
2025 | -4.1°C | 8.3°C | 20.7°C | 599 | 75% | 2.8 m/s |
2024 | -1.5°C | 10.1°C | 21.7°C | 679 | 76% | 2.6 m/s |
2023 | -2.6°C | 9.5°C | 21.5°C | 674 | 77% | 2.6 m/s |
2022 | -4.0°C | 8.6°C | 21.1°C | 598 | 76% | 2.8 m/s |
2021 | -2.4°C | 9.4°C | 21.1°C | 614 | 76% | 2.6 m/s |
2020 | -3.6°C | 8.6°C | 20.8°C | 620 | 77% | 2.7 m/s |
2019 | -4.9°C | 6.9°C | 18.6°C | 781 | 81% | 2.8 m/s |
2018 | -3.9°C | 8.4°C | 20.7°C | 783 | 80% | 2.7 m/s |
2017 | -3.6°C | 8.5°C | 20.5°C | 901 | 80% | 2.8 m/s |
2016 | -4.4°C | 8.6°C | 21.5°C | 693 | 77% | 2.7 m/s |
Showing 1 to 10 of 45 years
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.
