Greater Sudbury climate — normals and trends
Greater Sudbury (Canada) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 4.2 °C and it receives 845 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (18.8 °C on average) and the coldest is January (-12.2 °C). Rainfall peaks in September.
Greater Sudbury averages 173 frost days, 4 hot days (≥ 30 °C) and 126 rainy days per year.
Greater Sudbury has warmed by +1.6 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The number of frost days there went from about 178 to 168 per year over the period.
The hottest day of the period reached 37.8 °C (on 31 July 1975) and the coldest -40.6 °C (on 3 January 1981).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
Greater SudburyOntario
- coords
- 46.49°, -80.99°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
4.2°C
Average daily high
9.2°C
Average daily low
-0.8°C
Annual rainfall
845mm
Sunshine / day
8.4h
Mean relative humidity
75%
Average peak wind
16.8km/h
Seasonal range
31.0°C
Frost days (< 0 °C)
173 d/yr
Hot days (≥ 30 °C)
4 d/yr
Rainy days (≥ 1 mm)
126 d/yr
Annual snowfall
148.2 cm
Average feels-like high
6.4 °C
Average feels-like low
-4.4 °C
Average peak gust
38.4 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
13.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.25 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
37.8 °C
31 July 1975
Coldest day
-40.6 °C
3 January 1981
Wettest day
71 mm
21 August 1951
Windiest day
43.7 km/h
19 January 1949
Strongest gust
103.0 km/h
20 November 1985
Hottest feels-like
41.1 °C
31 July 1975
Coldest feels-like
-46.2 °C
3 January 1981
Snowiest day
23.5 cm
25 November 1950
Sunniest day
15.0 h
15 June 2025
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -7.7 °C | -0.2 °C | 41 mm | -10 mm |
| Feb | -6.8 °C | -1.3 °C | 53 mm | +11 mm |
| Mar | 1.2 °C | +0.6 °C | 138 mm | +81 mm |
| Apr | 8.5 °C | -0.4 °C | 94 mm | +26 mm |
| May | 17.3 °C | +0.4 °C | 70 mm | -4 mm |
| Jun | 22.7 °C | +0.8 °C | 67 mm | -14 mm |
| Jul | 25.4 °C | +1.1 °C | 99 mm | +12 mm |
| Aug | 24.2 °C | +1.3 °C | 39 mm | -47 mm |
| Sep | 20.5 °C | +2.5 °C | 39 mm | -49 mm |
| Oct | 13.9 °C | +2.9 °C | 75 mm | -6 mm |
| Nov | 1.9 °C | -0.9 °C | 64 mm | -9 mm |
| Dec | -5.4 °C | -1.0 °C | 87 mm | +31 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Greater Sudbury?
Greater Sudbury has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 4.2 °C and it receives 845 mm of precipitation per year.
What is the hottest day ever recorded in Greater Sudbury?
The hottest day measured in Greater Sudbury between 1940 and 2025 was 31 July 1975, reaching 37.8 °C.
What is the coldest day in Greater Sudbury?
The coldest day measured in Greater Sudbury between 1940 and 2025 was 3 January 1981, at -40.6 °C.
Does it snow in Greater Sudbury?
Yes. Greater Sudbury gets on average 148.2 cm of snow per year and has around 173 frost days.
Has the climate of Greater Sudbury warmed?
Yes: Greater Sudbury warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Greater Sudbury?
The wettest day measured in Greater Sudbury between 1940 and 2025 was 21 August 1951, with 71 mm of rain in 24 hours.
What was the windiest day in Greater Sudbury?
The windiest day measured in Greater Sudbury between 1940 and 2025 was 19 January 1949, with winds reaching 43.7 km/h.
What is the warmest month in Greater Sudbury?
The warmest month in Greater Sudbury is July (18.8 °C on average); the coldest is January (-12.2 °C).
How much does it rain in Greater Sudbury?
Greater Sudbury receives on average 845 mm of precipitation per year, spread over about 126 rainy days.
Is it sunny in Greater Sudbury?
Greater Sudbury gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
What is the biggest single-day snowfall in Greater Sudbury?
The heaviest 24-hour snowfall measured in Greater Sudbury between 1940 and 2025 was 25 November 1950, with 23.5 cm.
Are there tropical nights in Greater Sudbury?
Yes: Greater Sudbury has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Greater Sudbury?
In Greater Sudbury, between 1940 and 2025, the highest apparent temperature reached 41.1 °C on 31 July 1975, and the lowest was -46.2 °C on 3 January 1981.
Compare Greater Sudbury with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Greater Sudbury