Greater Sudbury climate
Greater Sudbury (Ontario, Canada) has a warm-summer humid continental climate (Köppen Dfb). The average temperature over the year is 4 °C40 °F, and about 817 mm32 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Greater Sudbury climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | −719 | −180 | −139 | 502.0 | 31 |
| Feb | −720 | −171 | −1211 | 441.7 | 28 |
| Mar | −131 | −1112 | −622 | 491.9 | 30 |
| Apr | 847 | −327 | 337 | 692.7 | 23 |
| May | 1762 | 440 | 1051 | 742.9 | 6 |
| Jun | 2272 | 1050 | 1661 | 783.1 | 0 |
| Jul | 2577 | 1456 | 1967 | 753.0 | 0 |
| Aug | 2476 | 1355 | 1966 | 813.2 | 0 |
| Sep | 2068 | 948 | 1558 | 783.1 | 0 |
| Oct | 1152 | 236 | 744 | 883.5 | 11 |
| Nov | 439 | −425 | 032 | 662.6 | 24 |
| Dec | −425 | −1211 | −818 | 612.4 | 31 |
| Year | 2577 | −180 | 440 | 81732 | 184 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 97% | 70% | 1.3 | 8:58 |
| Feb | 97% | 66% | 2.3 | 10:15 |
| Mar | 92% | 60% | 3.6 | 11:46 |
| Apr | 80% | 64% | 4.6 | 13:30 |
| May | 77% | 64% | 5.4 | 14:59 |
| Jun | 77% | 60% | 5.9 | 15:48 |
| Jul | 75% | 54% | 5.9 | 15:28 |
| Aug | 74% | 56% | 4.9 | 14:10 |
| Sep | 76% | 58% | 3.7 | 12:28 |
| Oct | 82% | 70% | 2.2 | 10:48 |
| Nov | 87% | 77% | 1.3 | 9:19 |
| Dec | 94% | 76% | 1.0 | 8:36 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Greater Sudbury is like
The warmest month is July, with an average high of 25 °C77 °F and a low of 14 °C56 °F. The coldest is January, when highs average −7 °C19 °F and lows −18 °C0 °F. The climate is extremely continental — the average temperature swings by 31.9 °C57.4 °F between the coldest and the warmest month.
Annual precipitation is moderate at about 817 mm32 in. Rain is spread fairly evenly through the year. The wettest month is October (88 mm3.5 in), the driest is February (44 mm1.7 in).
Relative humidity ranges from 74% in August to 97% in February. The clearest skies (lowest average cloud amount, 54%) are typical of July. Average wind speed near the ground ranges from 2 km/h (1 mph) in July to 5 km/h (3 mph) in February. Daylight lasts from about 8.6 hours in December to 15.8 hours in June.
A lasting snow cover is typical in November–April, when the average snow depth in the reanalysis exceeds 10 cm (deepest in February, about 31 cm).
Best time to visit Greater Sudbury
Based on these averages, the most comfortable months for sightseeing and outdoor activities are June–September: average highs of 20 °C68 °F to 25 °C77 °F with 75 mm3.0 in to 81 mm3.2 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of −7 °C19 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Greater Sudbury
- Winter (December–February) — highs −719 to −4 °C25 °F, lows −180 to −12 °C11 °F, about 52 mm2.0 in of precipitation a month. Pack heavy insulated clothing, thermal base layers, a warm hat, mittens and insulated boots.
- Spring (March–May) — highs −131 to 17 °C62 °F, lows −1112 to 4 °C40 °F, about 64 mm2.5 in of precipitation a month. Pack a warm coat, layers and closed shoes, an extra layer for the cooler mornings and evenings and shoes with good grip, as frost is common.
- Summer (June–August) — highs 2272 to 25 °C77 °F, lows 1050 to 14 °C56 °F, about 78 mm3.1 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
- Autumn (September–November) — highs 439 to 20 °C68 °F, lows −425 to 9 °C48 °F, about 78 mm3.1 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
How Greater Sudbury compares
Compared with Markham, about 321 km to the southeast, Greater Sudbury is on average 3.9 °C7.1 °F cooler and receives 13% more precipitation (817 mm32 in vs 723 mm28 in). The difference is largest in January (6.6 °C11.9 °F cooler).
Of the 40 places in Canada covered by World Climates, Greater Sudbury is the 34th warmest by annual mean temperature and the 20th wettest by annual precipitation. See all of them on the Canada climate page.
Places in other countries with the most similar temperature and rainfall pattern: Yuzhno-Sakhalinsk (Russia, Dfb), Murom (Russia, Dfb) and Vladimir (Russia, Dfb).
Nearby places
- Barrie 254 km · 7 °C45 °F · 623 mm25 in
- Markham 321 km · 8 °C47 °F · 723 mm28 in
- Brampton 327 km · 8 °C47 °F · 770 mm30 in
- Ajax 331 km · 9 °C48 °F · 719 mm28 in
- Guelph 332 km · 8 °C46 °F · 770 mm30 in
- Oshawa 333 km · 9 °C47 °F · 719 mm28 in
- Toronto 334 km · 9 °C48 °F · 774 mm30 in
- Kitchener 343 km · 8 °C46 °F · 762 mm30 in
Frequently asked questions
What is the warmest month in Greater Sudbury?
July is the warmest month in Greater Sudbury, with an average high of 25 °C (77 °F) and an average low of 14 °C (56 °F).
What is the coldest month in Greater Sudbury?
January is the coldest month, with an average high of -7 °C (19 °F) and an average low of -18 °C (0 °F).
When does it rain the most in Greater Sudbury?
October is the wettest month with about 88 mm (3.5 in) of precipitation; February is the driest with about 44 mm (1.7 in).
What is the best time to visit Greater Sudbury?
Judging by long-term averages, the most comfortable months are June–September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.