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Monthly climate in Napanee, Ontario, Canada

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Napanee features a humid continental climate (Dfb).Temperatures typically range between -6 °C (22 °F) and 22 °C (73 °F) through the year, but rarely can drop to -30 °C (-22 °F) or can rise to as high as 34 °C (94 °F).The average annual precipitation amounts to about 1093 mm (43.0 inches) and receives 129 rainy days on the 1 mm (0.04 inches) threshold annually.Napanee enjoys an average of 2775 hours of sunshine throughout the year, and daylight varies from 8 hours 54 minutes to 15 hours 26 minutes per day.

Monthly average temperatures in Napanee, Ontario, Canada §

The warmest months in Napanee are June, July and August, with daily mean temperatures ranging from 19 to 22 °C (66 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -6 to -2 °C (22 - 28 °F) throughout the day. On average each year, Napanee experiences 58 days above 25 °C (77.0 °F) and 124 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Napanee, 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
(51°F)		 15°C
(59°F)		 18°C
(64°F)		 26°C
(79°F)		 31°C
(88°F)		 31°C
(89°F)		 34°C
(94°F)		 32°C
(90°F)		 32°C
(90°F)		 26°C
(79°F)		 20°C
(69°F)		 14°C
(58°F)
Mean maximum 7°C
(46°F)		 9°C
(49°F)		 14°C
(58°F)		 20°C
(69°F)		 28°C
(83°F)		 30°C
(86°F)		 32°C
(89°F)		 30°C
(87°F)		 29°C
(84°F)		 24°C
(75°F)		 15°C
(60°F)		 10°C
(50°F)
Average high -2°C
(29°F)		 -0°C
(32°F)		 4°C
(40°F)		 11°C
(52°F)		 19°C
(66°F)		 24°C
(75°F)		 27°C
(81°F)		 26°C
(79°F)		 22°C
(72°F)		 15°C
(59°F)		 6°C
(44°F)		 1°C
(33°F)
Daily mean -6°C
(22°F)		 -4°C
(24°F)		 -0°C
(32°F)		 6°C
(44°F)		 14°C
(57°F)		 19°C
(66°F)		 22°C
(73°F)		 21°C
(71°F)		 17°C
(63°F)		 11°C
(52°F)		 3°C
(38°F)		 -2°C
(28°F)
Average low -10°C
(15°F)		 -9°C
(16°F)		 -4°C
(25°F)		 2°C
(36°F)		 8°C
(47°F)		 14°C
(57°F)		 18°C
(64°F)		 17°C
(62°F)		 12°C
(54°F)		 7°C
(45°F)		 -1°C
(31°F)		 -5°C
(23°F)
Mean minimum -24°C
(-11°F)		 -21°C
(-5°F)		 -16°C
(3°F)		 -4°C
(25°F)		 0°C
(33°F)		 8°C
(47°F)		 13°C
(55°F)		 11°C
(52°F)		 6°C
(42°F)		 -1°C
(31°F)		 -11°C
(13°F)		 -18°C
(0°F)
Minimum -30°C
(-22°F)		 -25°C
(-12°F)		 -20°C
(-4°F)		 -7°C
(19°F)		 -3°C
(28°F)		 4°C
(39°F)		 11°C
(53°F)		 9°C
(49°F)		 2°C
(36°F)		 -2°C
(28°F)		 -15°C
(5°F)		 -29°C
(-20°F)

Compare climate in Napanee with other places

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

Monthly average precipitation in Napanee, Ontario, Canada §

Napanee usually has the most precipitation in April, May and October, with an average of 12 rainy days and 118 mm (4.6 inches) of precipitation per month.The driest months in Napanee are January, March and September. On average, 71 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Napanee, 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) 71 (2.8) 73 (2.9) 70 (2.8) 120 (4.7) 95 (3.8) 90 (3.5) 95 (3.7) 90 (3.6) 72 (2.8) 137 (5.4) 94 (3.7) 85 (3.4)
Average precipitation days (≥ 1 mm) 9 12 10 11 12 11 11 11 8 13 11 10

Monthly sunshine hours in Napanee, Ontario, Canada §

The sunniest months in Napanee are June, July and August, when the sun shines an average of 10 hours 42 minutes a day.Least sunny months in Napanee: January, November and December receive an average of 4 hours 24 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Napanee, 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 123 153 231 228 278 321 337 326 290 200 152 129
Mean daily daylight hours 9h 16m 10h 28m 11h 57m 13h 29m 14h 47m 15h 26m 15h 5m 13h 55m 12h 27m 10h 55m 9h 35m 8h 54m

Solar UV radiation in Napanee, Ontario, Canada §

Napanee experiences the highest level of ultraviolet (UV) radiation in May, July and August, 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 Napanee UV Index data.

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