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Monthly climate in Duncan, Canada

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Duncan features a warm-summer Mediterranean climate (Csb). Temperatures typically range between 2 °C (36 °F) and 19 °C (66 °F) through the year, but rarely can drop to -13 °C (10 °F) or can rise to as high as 41 °C (106 °F). The average annual precipitation amounts to about 1449 mm (57.0 inches) and receives 150 rainy days on the 1 mm (0.04 inches) threshold annually. Duncan enjoys an average of 2730 hours of sunshine throughout the year, and daylight varies from 8 hours 19 minutes to 16 hours 4 minutes per day.

Monthly average temperatures in Duncan, Canada

The warmest months in Duncan are June, July and August, with daily mean temperatures ranging from 15 to 19 °C (60 - 66 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 2 to 3 °C (36 - 38 °F) throughout the day. On average each year, Duncan experiences 27 days above 25 °C (77.0 °F) and 47 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Duncan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum11°C
(51°F)		11°C
(53°F)		20°C
(69°F)		24°C
(76°F)		27°C
(81°F)		41°C
(106°F)		34°C
(93°F)		34°C
(94°F)		31°C
(89°F)		22°C
(73°F)		15°C
(60°F)		12°C
(54°F)
Mean maximum10°C
(50°F)		10°C
(50°F)		15°C
(58°F)		19°C
(66°F)		24°C
(76°F)		29°C
(84°F)		31°C
(88°F)		32°C
(90°F)		28°C
(82°F)		18°C
(64°F)		14°C
(57°F)		10°C
(50°F)
Average high6°C
(42°F)		5°C
(42°F)		9°C
(48°F)		12°C
(54°F)		17°C
(63°F)		20°C
(68°F)		24°C
(75°F)		24°C
(76°F)		19°C
(67°F)		13°C
(55°F)		8°C
(47°F)		5°C
(42°F)
Daily mean3°C
(38°F)		2°C
(36°F)		5°C
(41°F)		8°C
(47°F)		12°C
(55°F)		15°C
(60°F)		18°C
(65°F)		19°C
(66°F)		15°C
(59°F)		9°C
(49°F)		6°C
(43°F)		3°C
(37°F)
Average low1°C
(34°F)		-1°C
(31°F)		2°C
(36°F)		4°C
(40°F)		8°C
(47°F)		11°C
(52°F)		13°C
(55°F)		13°C
(56°F)		11°C
(52°F)		6°C
(43°F)		3°C
(38°F)		0°C
(33°F)
Mean minimum-6°C
(21°F)		-7°C
(20°F)		-3°C
(27°F)		0°C
(33°F)		4°C
(39°F)		7°C
(45°F)		10°C
(50°F)		10°C
(50°F)		6°C
(44°F)		-0°C
(32°F)		-2°C
(28°F)		-6°C
(21°F)
Minimum-13°C
(10°F)		-10°C
(14°F)		-4°C
(24°F)		-1°C
(31°F)		1°C
(34°F)		5°C
(42°F)		9°C
(48°F)		8°C
(47°F)		5°C
(42°F)		-2°C
(28°F)		-5°C
(24°F)		-12°C
(11°F)

Compare climate in Duncan with other places

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

Monthly average precipitation in Duncan, Canada

Duncan usually has the most precipitation in January, November and December, with an average of 17 rainy days and 225 mm (8.8 inches) of precipitation per month. The driest months in Duncan are June, July and August. On average, 30 mm (1.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Duncan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)215 (8.5)131 (5.2)118 (4.6)111 (4.4)54 (2.1)48 (1.9)18 (0.7)24 (1.0)120 (4.7)151 (6.0)245 (9.6)214 (8.4)
Average precipitation days (≥ 1 mm)161715141094411131819

Monthly sunshine hours in Duncan, Canada

The sunniest months in Duncan are June, July and August, when the sun shines an average of 11 hours 40 minutes a day. Least sunny months in Duncan: January, November and December receive an average of 3 hours 15 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Duncan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours8114420623732934438334525318412295
Mean daily daylight hours8h 46m10h 11m11h 57m13h 44m15h 17m16h 4m15h 38m14h 14m12h 30m10h 43m9h 8m8h 19m

Solar UV radiation in Duncan, Canada

Duncan experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 8 - 9, which corresponds to the Very High category of sun exposure. January, November and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 2. For more detailed information, check out our hourly Duncan UV Index data.

Average daily maximum UV levels by month for Duncan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)235689987421