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Monthly climate in Napierville, Canada

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Napierville features a humid continental climate (Dfb). Temperatures typically range between -8 °C (19 °F) and 22 °C (72 °F) through the year, but rarely can drop to -31 °C (-24 °F) or can rise to as high as 37 °C (99 °F). The average annual precipitation amounts to about 1211 mm (47.7 inches) and receives 146 rainy days on the 1 mm (0.04 inches) threshold annually. Napierville enjoys an average of 2785 hours of sunshine throughout the year, and daylight varies from 8 hours 46 minutes to 15 hours 34 minutes per day.

Monthly average temperatures in Napierville, Canada

The warmest months in Napierville are June, July and August, with daily mean temperatures ranging from 19 to 22 °C (67 - 72 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -8 to -4 °C (19 - 25 °F) throughout the day. On average each year, Napierville experiences 57 days above 25 °C (77.0 °F) and 131 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Napierville. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum10°C
(51°F)		14°C
(57°F)		22°C
(71°F)		25°C
(78°F)		37°C
(99°F)		34°C
(94°F)		36°C
(96°F)		34°C
(93°F)		32°C
(91°F)		27°C
(82°F)		23°C
(73°F)		14°C
(57°F)
Mean maximum6°C
(43°F)		8°C
(47°F)		14°C
(58°F)		21°C
(71°F)		31°C
(88°F)		31°C
(88°F)		32°C
(91°F)		31°C
(89°F)		29°C
(84°F)		24°C
(75°F)		16°C
(61°F)		11°C
(52°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
(42°F)		-1°C
(31°F)
Daily mean-8°C
(19°F)		-6°C
(21°F)		-1°C
(30°F)		6°C
(43°F)		14°C
(57°F)		19°C
(67°F)		22°C
(72°F)		21°C
(70°F)		16°C
(62°F)		10°C
(51°F)		2°C
(35°F)		-4°C
(25°F)
Average low-11°C
(12°F)		-11°C
(13°F)		-5°C
(23°F)		2°C
(36°F)		8°C
(48°F)		14°C
(57°F)		17°C
(63°F)		16°C
(62°F)		12°C
(54°F)		6°C
(44°F)		-2°C
(29°F)		-7°C
(19°F)
Mean minimum-24°C
(-10°F)		-22°C
(-7°F)		-18°C
(0°F)		-5°C
(23°F)		1°C
(33°F)		8°C
(46°F)		11°C
(52°F)		10°C
(50°F)		4°C
(39°F)		-1°C
(30°F)		-12°C
(11°F)		-19°C
(-2°F)
Minimum-31°C
(-24°F)		-25°C
(-12°F)		-21°C
(-5°F)		-8°C
(17°F)		-0°C
(31°F)		3°C
(38°F)		10°C
(50°F)		8°C
(47°F)		0°C
(33°F)		-4°C
(25°F)		-16°C
(4°F)		-26°C
(-15°F)

Compare climate in Napierville with other places

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

Monthly average precipitation in Napierville, Canada

Napierville usually has the most precipitation in April, July and October, with an average of 14 rainy days and 124 mm (4.9 inches) of precipitation per month. The driest months in Napierville are January, February and September. On average, 78 mm (3.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Napierville. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)81 (3.2)80 (3.1)82 (3.2)116 (4.6)98 (3.8)112 (4.4)116 (4.6)115 (4.5)73 (2.9)141 (5.6)114 (4.5)82 (3.2)
Average precipitation days (≥ 1 mm)11111113111215139141412

Monthly sunshine hours in Napierville, Canada

The sunniest months in Napierville are June, July and August, when the sun shines an average of 10 hours 52 minutes a day. Least sunny months in Napierville: January, November and December receive an average of 4 hours 25 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Napierville. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours117153233222283324341334288196147143
Mean daily daylight hours9h 10m10h 24m11h 57m13h 32m14h 53m15h 34m15h 12m13h 59m12h 28m10h 53m9h 29m8h 46m

Solar UV radiation in Napierville, Canada

Napierville experiences the highest level of ultraviolet (UV) radiation in May, June 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 / 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 Napierville UV Index data.

Average daily maximum UV levels by month for Napierville. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)245799887532