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Monthly climate in Mattawa, Ontario, Canada

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Mattawa features a humid continental climate (Dfb). Temperatures typically range between -11 °C (13 °F) and 20 °C (68 °F) through the year, but rarely can drop to -36 °C (-33 °F) or can rise to as high as 35 °C (96 °F). The average annual precipitation amounts to about 1072 mm (42.2 inches) and receives 148 rainy days on the 1 mm (0.04 inches) threshold annually. Mattawa enjoys an average of 2586 hours of sunshine throughout the year, and daylight varies from 8 hours 39 minutes to 15 hours 43 minutes per day.

Monthly average temperatures in Mattawa, Ontario, Canada §

The warmest months in Mattawa are June, July and August, with daily mean temperatures ranging from 17 to 20 °C (62 - 68 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -11 to -7 °C (13 - 19 °F) throughout the day. On average each year, Mattawa experiences 43 days above 25 °C (77.0 °F) and 163 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Mattawa, 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 10°C
(50°F)		 9°C
(48°F)		 19°C
(67°F)		 28°C
(83°F)		 35°C
(96°F)		 32°C
(91°F)		 35°C
(96°F)		 31°C
(88°F)		 31°C
(88°F)		 26°C
(79°F)		 23°C
(74°F)		 16°C
(60°F)
Mean maximum 4°C
(39°F)		 6°C
(43°F)		 11°C
(52°F)		 21°C
(70°F)		 30°C
(86°F)		 31°C
(88°F)		 32°C
(89°F)		 30°C
(85°F)		 28°C
(82°F)		 23°C
(73°F)		 14°C
(57°F)		 7°C
(46°F)
Average high -6°C
(21°F)		 -4°C
(25°F)		 1°C
(34°F)		 9°C
(48°F)		 17°C
(64°F)		 22°C
(73°F)		 26°C
(79°F)		 24°C
(75°F)		 19°C
(67°F)		 12°C
(54°F)		 3°C
(37°F)		 -4°C
(26°F)
Daily mean -11°C
(13°F)		 -10°C
(15°F)		 -4°C
(24°F)		 3°C
(38°F)		 11°C
(53°F)		 17°C
(62°F)		 20°C
(68°F)		 18°C
(65°F)		 14°C
(57°F)		 7°C
(46°F)		 -1°C
(31°F)		 -7°C
(19°F)
Average low -16°C
(4°F)		 -15°C
(6°F)		 -10°C
(15°F)		 -1°C
(30°F)		 5°C
(41°F)		 10°C
(50°F)		 14°C
(58°F)		 13°C
(56°F)		 9°C
(48°F)		 3°C
(38°F)		 -4°C
(24°F)		 -11°C
(12°F)
Mean minimum -31°C
(-23°F)		 -29°C
(-21°F)		 -24°C
(-11°F)		 -10°C
(14°F)		 -4°C
(26°F)		 4°C
(40°F)		 8°C
(48°F)		 7°C
(45°F)		 1°C
(34°F)		 -4°C
(25°F)		 -15°C
(5°F)		 -26°C
(-14°F)
Minimum -36°C
(-33°F)		 -33°C
(-27°F)		 -29°C
(-20°F)		 -18°C
(0°F)		 -6°C
(22°F)		 0°C
(33°F)		 7°C
(44°F)		 4°C
(40°F)		 -3°C
(27°F)		 -9°C
(16°F)		 -20°C
(-4°F)		 -34°C
(-28°F)

Compare climate in Mattawa with other places

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

Monthly average precipitation in Mattawa, Ontario, Canada §

Mattawa usually has the most precipitation in June, August and September, with an average of 12 rainy days and 109 mm (4.3 inches) of precipitation per month. The driest months in Mattawa are January, February and March. On average, 61 mm (2.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Mattawa, 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) 55 (2.2) 66 (2.6) 61 (2.4) 99 (3.9) 103 (4.1) 106 (4.2) 95 (3.7) 116 (4.6) 105 (4.2) 103 (4.0) 86 (3.4) 76 (3.0)
Average precipitation days (≥ 1 mm) 9 13 11 13 11 12 11 14 12 14 14 14

Monthly sunshine hours in Mattawa, Ontario, Canada §

The sunniest months in Mattawa are June, July and August, when the sun shines an average of 10 hours 13 minutes a day. Least sunny months in Mattawa: January, November and December receive an average of 3 hours 35 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Mattawa, 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 94 157 233 223 272 305 337 297 251 176 120 114
Mean daily daylight hours 9h 3m 10h 20m 11h 57m 13h 36m 15h 0m 15h 43m 15h 19m 14h 4m 12h 29m 10h 50m 9h 24m 8h 39m

Solar UV radiation in Mattawa, Ontario, Canada §

Mattawa experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 9 - 9, which corresponds to the Very High category of sun exposure. January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Mattawa UV Index data.

Average daily maximum UV levels by month for Mattawa, 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 3 5 7 9 9 9 8 7 5 3 2

Detailed Monthly Weather Insights for Mattawa, Ontario, Canada

Discover in-depth weather details for every month in Mattawa. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Mattawa's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.