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Monthly climate in Chatham, Ontario, Canada

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Chatham features a humid continental climate (Dfb).Temperatures typically range between -3 °C (28 °F) and 23 °C (74 °F) through the year, but rarely can drop to -23 °C (-10 °F) or can rise to as high as 34 °C (93 °F).The average annual precipitation amounts to about 1010 mm (39.8 inches) and receives 134 rainy days on the 1 mm (0.04 inches) threshold annually.Chatham enjoys an average of 2993 hours of sunshine throughout the year, and daylight varies from 9 hours 6 minutes to 15 hours 13 minutes per day.

Monthly average temperatures in Chatham, Ontario, Canada §

The warmest months in Chatham are June, July and August, with daily mean temperatures ranging from 21 to 23 °C (69 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -3 to 1 °C (28 - 33 °F) throughout the day. On average each year, Chatham experiences 66 days above 25 °C (77.0 °F) and 104 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Chatham, Ontario, Canada.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 12°C
(54°F)		 18°C
(65°F)		 20°C
(69°F)		 25°C
(78°F)		 32°C
(89°F)		 33°C
(91°F)		 34°C
(93°F)		 33°C
(91°F)		 32°C
(90°F)		 28°C
(83°F)		 22°C
(72°F)		 16°C
(61°F)
Mean maximum 10°C
(50°F)		 12°C
(54°F)		 18°C
(64°F)		 22°C
(72°F)		 30°C
(85°F)		 31°C
(88°F)		 33°C
(91°F)		 31°C
(88°F)		 30°C
(86°F)		 26°C
(80°F)		 16°C
(62°F)		 13°C
(56°F)
Average high 0°C
(33°F)		 2°C
(35°F)		 7°C
(44°F)		 12°C
(54°F)		 19°C
(67°F)		 25°C
(77°F)		 28°C
(82°F)		 27°C
(80°F)		 23°C
(74°F)		 16°C
(62°F)		 8°C
(46°F)		 3°C
(38°F)
Daily mean -3°C
(28°F)		 -2°C
(29°F)		 2°C
(36°F)		 8°C
(46°F)		 14°C
(58°F)		 21°C
(69°F)		 23°C
(74°F)		 22°C
(73°F)		 19°C
(66°F)		 13°C
(55°F)		 5°C
(40°F)		 1°C
(33°F)
Average low -6°C
(22°F)		 -5°C
(23°F)		 -2°C
(29°F)		 3°C
(38°F)		 10°C
(50°F)		 16°C
(61°F)		 19°C
(66°F)		 18°C
(65°F)		 14°C
(58°F)		 9°C
(48°F)		 1°C
(34°F)		 -2°C
(28°F)
Mean minimum -17°C
(1°F)		 -16°C
(4°F)		 -10°C
(14°F)		 -4°C
(25°F)		 1°C
(34°F)		 11°C
(51°F)		 13°C
(56°F)		 11°C
(53°F)		 7°C
(45°F)		 1°C
(34°F)		 -7°C
(19°F)		 -10°C
(13°F)
Minimum -23°C
(-10°F)		 -23°C
(-9°F)		 -16°C
(4°F)		 -6°C
(21°F)		 -2°C
(29°F)		 7°C
(45°F)		 11°C
(53°F)		 8°C
(47°F)		 4°C
(39°F)		 -0°C
(31°F)		 -13°C
(9°F)		 -20°C
(-4°F)

Compare climate in Chatham with other places

Compare temperature, precipitation, sunshine, UV index in Chatham, Ontario, Canada with other places around the world.

Monthly average precipitation in Chatham, Ontario, Canada §

Chatham usually has the most precipitation in April, May and October, with an average of 14 rainy days and 103 mm (4.0 inches) of precipitation per month.The driest months in Chatham are January, February and December. On average, 67 mm (2.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Chatham, Ontario, Canada.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 67 (2.6) 69 (2.7) 71 (2.8) 96 (3.8) 104 (4.1) 96 (3.8) 95 (3.8) 83 (3.2) 76 (3.0) 108 (4.2) 80 (3.2) 64 (2.5)
Average precipitation days (≥ 1 mm) 9 11 10 14 15 10 10 11 10 14 9 11

Monthly sunshine hours in Chatham, Ontario, Canada §

The sunniest months in Chatham are June, July and August, when the sun shines an average of 11 hours 29 minutes a day.Least sunny months in Chatham: January, February and December receive an average of 4 hours 32 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Chatham, Ontario, Canada.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 111 163 250 260 303 349 363 342 299 235 174 138
Mean daily daylight hours 9h 27m 10h 34m 11h 58m 13h 24m 14h 37m 15h 13m 14h 53m 13h 48m 12h 25m 11h 0m 9h 45m 9h 6m

Solar UV radiation in Chatham, Ontario, Canada §

Chatham experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure.January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Chatham UV Index data.

Average daily maximum UV levels by month for Chatham, Ontario, Canada.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 2 5 5 8 9 10 10 9 8 6 4 2