Weather in Ontario

Calculated from weather data of John C. Munro Hamilton International Airport (CYHM) between 2020 and 2024.

Maximum temperatures (°C)

Month	Average	2024	2023	2022	2021	2020
January	-1.2	-1.5	1.1	-4.5	-1.8	1.3
February	1.4	4.5	3.2	-1.9	-3.7	0.6
March	5.5	7.9	4.0	5.7	9.5	6.5
April	11.5		13.5	11.0	12.8	10.0
May	19.0		19.1	20.3	19.0	17.3
June	24.2		23.1	24.8	25.8	25.6
July	26.9		26.1	27.1	25.1	29.1
August	25.6		23.6	26.8	27.1	26.5
September	22.1		21.8	21.6	22.1	21.3
October	15.3		15.5	15.4	16.6	13.5
November	7.4		7.7	9.5	7.7	11.0
December	2.4		5.0	2.2	4.2	2.6
Average	12.2	3.9	13.7	13.9	14.0	13.8

43rd highest temperature of Canada

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	-7.3	-5	-3	-12	-5	-4
February	-7.8	-4	-5	-9	-10	-5
March	-3.1	0	-3	-3	-2	-1
April	1.9		3	2	2	1
May	7.8		7	10	7	7
June	13.7		14	13	15	14
July	16.5		16	16	16	18
August	15.8		15	16	17	16
September	12.5		13	12	12	11
October	6.8		8	4	10	5
November	-1.8		0	1	0	2
December	-4.8		0	-3	-2	-3
Average	3.7	-3.0	5.4	4.2	5.1	4.9

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	2	5	3	16
25 °C or warmer	0	49	78	63	76
20 °C or warmer	1	125	134	134	120
0 °C or colder	61	106	110	121	111

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	33.8	44	37	36	20	25
February	29.2	13	23	41	32	28
March	22.4	27	28	27	8	18
April	18.1		20	17	15	18
May	12.7		8	15	9	15
June	7.7		15	7	6	3
July	5.6		10	4	9	3
August	4.2		8	5	2	5
September	5.8		6	11	6	5
October	13.9		12	9	19	15
November	17.9		16	18	16	14
December	28.0		34	39	22	25
Average	17.0	27.8	17.3	17.2	12.6	13.4

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	19.1	20	17	18	16	18
February	21.2	18	24	22	20	21
March	20.6	19	21	21	20	21
April	20.2		19	19	18	21
May	17.4		15	18	16	18
June	16.1		14	16	17	16
July	13.7		12	14	14	14
August	14.5		15	14	13	16
September	15.5		14	15	16	18
October	18.1		17	17	17	18
November	19.0		19	20	17	21
December	18.4		18	20	19	19
Average	17.8	18.9	16.7	17.6	16.7	18.0

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	SW	NW	W	W	W
February	SW	SW	W	W	W
March	W	W	W	W	NW
April		W	W	NW	W
May		N	NE	NW	NW
June		NE	W	SW	SW
July		SW	W	NW	W
August		W	SW	SW	W
September		N	W	W	SW
October		SW	SW	N	W
November		SW	SW	SW	SW
December		NW	W	SW	W

Prevailing wind direction

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

Ontario weather Q&A

What is the warmest month in Ontario?

The warmest month is July with an average temperature of 27 °C over the past years.

What is the coldest month in Ontario?

The coldest month is January with an average daytime temperature of -1 °C in the past few years.

Which month is the wettest in Ontario?

Chance of precipitation is the highest in January with a probability of around 33.8 %.

Which month is the driest in Ontario?

The least rainfall and snow can be expected in August. The probability is about 4.2 %.