Weather in Sudbury

Calculated from weather data of Sudbury Airport (CYSB) between 2020 and 2024.

Maximum temperatures (°C)

Month	Average	2024	2023	2022	2021	2020
January	-7.8	-6.5	-5.7	-10.3	-6.7	-5.7
February	-5.8	-1.4	-4.6	-7.7	-6.5	-4.1
March	0.9	3.9	0.5	0.2	3.9	1.9
April	8.0		9.1	7.7	11.9	7.0
May	17.5		18.5	19.6	17.5	16.1
June	22.7		23.8	22.3	23.1	23.8
July	25.2		24.8	24.5	24.1	26.1
August	23.3		22.0	23.6	25.3	22.5
September	19.0		21.1	19.3	18.1	16.5
October	11.3		12.0	12.3	14.8	7.5
November	2.4		2.7	5.0	3.2	6.4
December	-4.6		-1.8	-3.9	-3.9	-3.2
Average	8.4	-1.2	10.6	10.2	10.8	9.8

Average highest temperature per day

The maximum temperature is typically observed some hours after noon.

Minimum temperatures (°C)

Month	Average	2024	2023	2022	2021	2020
January	-15.9	-11	-11	-22	-11	-11
February	-14.1	-10	-14	-17	-15	-14
March	-9.6	-5	-9	-9	-7	-7
April	-2.1		-1	-2	1	-3
May	5.7		6	8	5	5
June	11.1		12	11	12	11
July	14.2		14	13	14	16
August	13.3		12	14	15	13
September	9.4		10	10	9	8
October	3.7		5	3	7	1
November	-5.3		-5	-2	-4	-2
December	-11.7		-5	-9	-10	-9
Average	-1.2	-9.4	1.3	0.2	1.4	0.7

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Cold and hot days

Number of days	2024	2023	2022	2021	2020
30 °C or warmer	0	3	2	3	4
25 °C or warmer	0	33	40	40	45
20 °C or warmer	0	112	104	105	87
0 °C or colder	84	158	150	150	180

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	41.1	43	42	51	20	50
February	37.1	24	46	42	24	35
March	24.3	28	30	37	13	19
April	24.5		30	29	15	19
May	14.8		12	12	11	14
June	11.0		11	6	17	8
July	8.3		10	10	12	8
August	10.4		13	13	6	14
September	13.3		8	17	17	14
October	22.5		34	21	20	17
November	31.3		26	23	23	30
December	34.6		20	41	32	29
Average	22.3	31.0	22.2	22.6	16.4	19.5

Precipitation during daylight period

Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.

Wind speed (km/h)

Month	Average	2024	2023	2022	2021	2020
January	16.5	16	16	16	15	16
February	18.2	17	19	20	17	19
March	18.8	19	19	19	21	18
April	18.7		19	18	18	18
May	17.5		18	18	17	16
June	16.0		15	17	17	16
July	14.5		12	16	15	14
August	14.3		14	15	15	13
September	15.9		14	16	17	17
October	17.4		18	18	15	16
November	17.5		17	20	16	18
December	16.5		16	18	16	18
Average	16.9	17.4	16.4	17.4	16.7	16.4

Average wind speed

Excluding wind gusts. Only observations between sunrise and sunset are taken into account.

Prevailing wind direction

Month	2024	2023	2022	2021	2020
January	W	N	SW	N	N
February	SW	SW	W	SW	W
March	NW	N	W	SW	S
April		S	SW	N	NW
May		N	S	W	N
June		NE	SW	SW	SW
July		W	SW	N	W
August		NW	W	SW	NW
September		SW	NW	SW	SW
October		W	S	NE	SW
November		SW	SW	SW	SW
December		NE	E	SW	NW

Prevailing wind direction

Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.

Sudbury weather Q&A

What is the warmest month in Sudbury?

The warmest month is July with an average temperature of 25 °C over the past years.

What is the coldest month in Sudbury?

The coldest month is January with an average daytime temperature of -6 °C in the past few years.

Which month is the wettest in Sudbury?

Chance of precipitation is the highest in January with a probability of around 41.2 %.

Which month is the driest in Sudbury?

The least rainfall and snow can be expected in July. The probability is about 8.4 %.