Greater Sudbury climate

Name: Greater Sudbury
Address: CA

Greater Sudbury is warmest in July, with average highs of 25 °C, and coldest in January, when nights average -16 °C. October is the wettest month (94 mm) and February the driest (42 mm). Figures are 1991–2020 climate normals.

Across a full year Greater Sudbury averages 867 mm of rain, 34 days above 25 °C and 164 days below freezing.

Canada · population 166,004 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month July 25 °C
Coldest month January -16 °C
Driest month February 42 mm
Wettest month October 94 mm
Least cloud July 55 % cloud
Hottest on record June 37 °C
Coldest on record December -37 °C

What to expectGreater Sudbury through the year

Greater Sudbury has a clear annual cycle: average daily highs run from -6.9 °C in January to 25 °C in July, a swing of 31 °C in mean temperature across the year.

Counted across a normal year, 34 days a year reach 25 °C, 3 of them reach 30 °C, 164 nights drop below freezing. The warmest reading in the 1991–2020 record is 37 °C, in June.

Rain is strongly seasonal. October averages 94 mm against 42 mm in February — 2.2 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	-6.9 °C	53 mm	71 %
February	-5.3 °C	42 mm	67 %
March	0.7 °C	50 mm	63 %
April	8.6 °C	70 mm	64 %
May	17.2 °C	73 mm	62 %
June	22.5 °C	81 mm	60 %
July	24.5 °C	85 mm	55 %
August	23.3 °C	92 mm	56 %
September	18.8 °C	93 mm	59 %
October	11.1 °C	94 mm	69 %
November	3.6 °C	74 mm	76 %
December	-3.0 °C	60 mm	76 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C	Days below 0 °C
January	-6.9 °C	-16.1 °C	-11.8 °C	7.7 °C	-36.8 °C	0	0	30
February	-5.3 °C	-14.7 °C	-10.5 °C	9.2 °C	-33.3 °C	0	0	28
March	0.7 °C	-9.0 °C	-4.6 °C	22.1 °C	-30.9 °C	0	0	29
April	8.6 °C	-1.7 °C	3.0 °C	23.7 °C	-21.3 °C	0	0	19
May	17.2 °C	6.0 °C	11.2 °C	33.0 °C	-6.6 °C	2	0	3
June	22.5 °C	12.2 °C	17.0 °C	36.5 °C	2.4 °C	8	0	0
July	24.5 °C	15.1 °C	19.5 °C	34.3 °C	7.9 °C	13	2	0
August	23.3 °C	14.5 °C	18.5 °C	34.1 °C	7.1 °C	9	1	0
September	18.8 °C	10.8 °C	14.4 °C	30.1 °C	-0.1 °C	2	0	0
October	11.1 °C	4.2 °C	7.2 °C	25.5 °C	-8.0 °C	0	0	5
November	3.6 °C	-3.0 °C	-0.0 °C	18.1 °C	-24.4 °C	0	0	21
December	-3.0 °C	-10.8 °C	-7.1 °C	11.1 °C	-37.1 °C	0	0	29

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	53 mm	10	9.0 h/day	71 %	77 %	17 km/h
February	42 mm	7	10 h/day	67 %	75 %	17 km/h
March	50 mm	8	12 h/day	63 %	71 %	17 km/h
April	70 mm	10	14 h/day	64 %	66 %	18 km/h
May	73 mm	10	15 h/day	62 %	66 %	17 km/h
June	81 mm	11	16 h/day	60 %	69 %	16 km/h
July	85 mm	11	15 h/day	55 %	72 %	16 km/h
August	92 mm	11	14 h/day	56 %	75 %	16 km/h
September	93 mm	11	13 h/day	59 %	77 %	17 km/h
October	94 mm	12	11 h/day	69 %	78 %	18 km/h
November	74 mm	11	9.4 h/day	76 %	80 %	18 km/h
December	60 mm	11	8.6 h/day	76 %	80 %	17 km/h

How Greater Sudbury compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Greater Sudbury	25 °C	-16 °C	867 mm	34
Vaughan · Canada	26 °C	-9.4 °C	812 mm	53
Markham · Canada	26 °C	-9.3 °C	888 mm	51
Brampton · Canada	26 °C	-9.6 °C	828 mm	60
Oshawa · Canada	25 °C	-8.1 °C	892 mm	40
Toronto · Canada	25 °C	-8.1 °C	806 mm	43
Etobicoke · Canada	26 °C	-7.9 °C	804 mm	52

Where Greater Sudbury ranks

Ranking	Position	Value
The coolest places in North America in February	5th of 50	-5.3 °C
The coolest places in North America in April	6th of 50	8.6 °C
The coolest places in North America in January	6th of 50	-6.9 °C
The coolest places in North America in March	6th of 50	0.7 °C
The coolest places in North America in December	7th of 50	-3.0 °C
The coolest places in North America in November	8th of 50	3.6 °C

Planning a trip? See the best time to visit Greater Sudbury.

QuestionsCommon questions about Greater Sudbury’s climate

When is the best time to visit Greater Sudbury?

That depends on what you want, so the honest answer is a comparison rather than a single month. June, July, August sit closest to 20 °C on average, July is the warmest month and February the driest. The month-by-month table above has the full picture.

How hot does Greater Sudbury get?

In July, the warmest month, daily highs average 25 °C. About 3 days a year pass 30 °C. The highest value in the 1991–2020 record is 37 °C.

How cold does it get in winter?

Nights average -16 °C in January, the coldest month. A normal year has 164 nights below freezing.

Which month is wettest in Greater Sudbury?

October, averaging 94 mm over 12 days with rain. The driest month is February with 42 mm. The year as a whole averages 867 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Greater Sudbury rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 46.490°, -80.990° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.