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Monthly climate in Nepean, Ontario, Canada

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Nepean features a humid continental climate (Dfb).Temperatures typically range between -8 °C (18 °F) and 22 °C (72 °F) through the year, but rarely can drop to -32 °C (-25 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 1122 mm (44.2 inches) and receives 144 rainy days on the 1 mm (0.04 inches) threshold annually.Nepean enjoys an average of 2748 hours of sunshine throughout the year, and daylight varies from 8 hours 47 minutes to 15 hours 33 minutes per day.

Monthly average temperatures in Nepean, Ontario, Canada §

The warmest months in Nepean are June, July and August, with daily mean temperatures ranging from 19 to 22 °C (66 - 72 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -8 to -5 °C (18 - 24 °F) throughout the day. On average each year, Nepean experiences 59 days above 25 °C (77.0 °F) and 139 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Nepean, 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 11°C
(52°F)		 13°C
(55°F)		 21°C
(70°F)		 29°C
(84°F)		 35°C
(96°F)		 33°C
(92°F)		 36°C
(97°F)		 33°C
(91°F)		 33°C
(92°F)		 27°C
(82°F)		 22°C
(72°F)		 15°C
(60°F)
Mean maximum 5°C
(42°F)		 8°C
(47°F)		 13°C
(56°F)		 22°C
(72°F)		 31°C
(88°F)		 31°C
(88°F)		 33°C
(91°F)		 31°C
(88°F)		 29°C
(84°F)		 24°C
(76°F)		 15°C
(59°F)		 10°C
(50°F)
Average high -4°C
(25°F)		 -2°C
(29°F)		 3°C
(37°F)		 11°C
(52°F)		 19°C
(67°F)		 24°C
(76°F)		 27°C
(81°F)		 26°C
(79°F)		 22°C
(71°F)		 14°C
(58°F)		 5°C
(41°F)		 -1°C
(30°F)
Daily mean -8°C
(18°F)		 -7°C
(20°F)		 -2°C
(29°F)		 6°C
(43°F)		 13°C
(57°F)		 19°C
(66°F)		 22°C
(72°F)		 20°C
(69°F)		 16°C
(61°F)		 10°C
(49°F)		 1°C
(34°F)		 -5°C
(24°F)
Average low -13°C
(9°F)		 -12°C
(11°F)		 -7°C
(20°F)		 1°C
(35°F)		 8°C
(46°F)		 12°C
(55°F)		 16°C
(61°F)		 15°C
(60°F)		 11°C
(52°F)		 5°C
(42°F)		 -3°C
(27°F)		 -8°C
(18°F)
Mean minimum -27°C
(-16°F)		 -25°C
(-13°F)		 -20°C
(-4°F)		 -6°C
(22°F)		 -0°C
(32°F)		 6°C
(44°F)		 11°C
(51°F)		 9°C
(48°F)		 4°C
(39°F)		 -2°C
(28°F)		 -14°C
(7°F)		 -22°C
(-7°F)
Minimum -32°C
(-25°F)		 -28°C
(-18°F)		 -22°C
(-7°F)		 -11°C
(13°F)		 -3°C
(27°F)		 2°C
(36°F)		 9°C
(48°F)		 7°C
(45°F)		 -0°C
(32°F)		 -5°C
(23°F)		 -18°C
(-0°F)		 -29°C
(-21°F)

Compare climate in Nepean with other places

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

Monthly average precipitation in Nepean, Ontario, Canada §

Nepean usually has the most precipitation in April, July and October, with an average of 12 rainy days and 119 mm (4.7 inches) of precipitation per month.The driest months in Nepean are January, September and December. On average, 72 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Nepean, 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) 74 (2.9) 78 (3.1) 84 (3.3) 115 (4.5) 111 (4.4) 92 (3.6) 112 (4.4) 89 (3.5) 66 (2.6) 131 (5.1) 94 (3.7) 77 (3.0)
Average precipitation days (≥ 1 mm) 10 13 12 12 13 13 12 12 9 13 13 12

Monthly sunshine hours in Nepean, Ontario, Canada §

The sunniest months in Nepean are June, July and August, when the sun shines an average of 10 hours 46 minutes a day.Least sunny months in Nepean: January, November and December receive an average of 4 hours 13 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Nepean, 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 112 153 233 227 282 319 348 322 274 196 148 127
Mean daily daylight hours 9h 11m 10h 24m 11h 57m 13h 32m 14h 53m 15h 33m 15h 11m 13h 59m 12h 28m 10h 53m 9h 30m 8h 47m

Solar UV radiation in Nepean, Ontario, Canada §

Nepean 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, November 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 Nepean UV Index data.

Average daily maximum UV levels by month for Nepean, 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 4 5 8 9 9 9 8 7 5 3 2