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Monthly climate in Westville, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Westville features a humid continental climate (Dfa).Temperatures typically range between -2 °C (29 °F) and 25 °C (78 °F) through the year, but rarely can drop to -27 °C (-16 °F) or can rise to as high as 36 °C (96 °F).The average annual precipitation amounts to about 1165 mm (45.9 inches) and receives 127 rainy days on the 1 mm (0.04 inches) threshold annually.Westville enjoys an average of 2891 hours of sunshine throughout the year, and daylight varies from 9 hours 21 minutes to 14 hours 57 minutes per day.

Monthly average temperatures in Westville, Illinois, United States §

The warmest months in Westville are June, July and August, with daily mean temperatures ranging from 24 to 25 °C (75 - 78 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 2 °C (29 - 36 °F) throughout the day. On average each year, Westville experiences 110 days above 25 °C (77.0 °F) and 92 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Westville, Illinois, United States.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 18°C
(65°F)		 22°C
(71°F)		 25°C
(78°F)		 29°C
(85°F)		 34°C
(94°F)		 35°C
(95°F)		 36°C
(96°F)		 35°C
(95°F)		 34°C
(94°F)		 33°C
(92°F)		 25°C
(78°F)		 18°C
(65°F)
Mean maximum 14°C
(58°F)		 17°C
(63°F)		 21°C
(71°F)		 27°C
(81°F)		 31°C
(89°F)		 33°C
(92°F)		 34°C
(93°F)		 33°C
(92°F)		 33°C
(91°F)		 30°C
(87°F)		 20°C
(68°F)		 17°C
(63°F)
Average high 2°C
(36°F)		 5°C
(41°F)		 11°C
(53°F)		 17°C
(62°F)		 23°C
(74°F)		 29°C
(84°F)		 30°C
(86°F)		 28°C
(84°F)		 27°C
(81°F)		 19°C
(67°F)		 10°C
(50°F)		 7°C
(45°F)
Daily mean -2°C
(29°F)		 -0°C
(32°F)		 6°C
(43°F)		 11°C
(53°F)		 18°C
(65°F)		 24°C
(75°F)		 25°C
(78°F)		 24°C
(75°F)		 21°C
(71°F)		 14°C
(58°F)		 5°C
(42°F)		 2°C
(36°F)
Average low -6°C
(22°F)		 -5°C
(24°F)		 1°C
(34°F)		 6°C
(43°F)		 13°C
(56°F)		 18°C
(65°F)		 20°C
(69°F)		 19°C
(66°F)		 16°C
(61°F)		 9°C
(49°F)		 1°C
(33°F)		 -2°C
(28°F)
Mean minimum -19°C
(-3°F)		 -18°C
(0°F)		 -10°C
(14°F)		 -3°C
(27°F)		 3°C
(38°F)		 13°C
(56°F)		 15°C
(59°F)		 12°C
(55°F)		 8°C
(47°F)		 -0°C
(32°F)		 -8°C
(18°F)		 -14°C
(7°F)
Minimum -27°C
(-16°F)		 -21°C
(-6°F)		 -17°C
(1°F)		 -6°C
(21°F)		 -0°C
(32°F)		 10°C
(50°F)		 13°C
(55°F)		 12°C
(54°F)		 6°C
(43°F)		 -4°C
(25°F)		 -13°C
(9°F)		 -21°C
(-5°F)

Compare climate in Westville with other places

Compare temperature, precipitation, sunshine, UV index in Westville, Illinois, United States with other places around the world.

Monthly average precipitation in Westville, Illinois, United States §

Westville usually has the most precipitation in April, May and October, with an average of 12 rainy days and 126 mm (4.9 inches) of precipitation per month.The driest months in Westville are September, November and December. On average, 72 mm (2.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Westville, Illinois, United States.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) 79 (3.1) 79 (3.1) 112 (4.4) 114 (4.5) 143 (5.6) 105 (4.1) 92 (3.6) 106 (4.2) 74 (2.9) 120 (4.7) 79 (3.1) 61 (2.4)
Average precipitation days (≥ 1 mm) 9 10 13 11 14 12 11 11 7 11 9 9

Monthly sunshine hours in Westville, Illinois, United States §

The sunniest months in Westville are June, July and August, when the sun shines an average of 10 hours 56 minutes a day.Least sunny months in Westville: January, February and December receive an average of 4 hours 59 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Westville, Illinois, United States.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 112 162 215 236 276 330 348 327 285 228 186 179
Mean daily daylight hours 9h 40m 10h 41m 11h 58m 13h 17m 14h 24m 14h 57m 14h 39m 13h 39m 12h 24m 11h 5m 9h 56m 9h 21m

Solar UV radiation in Westville, Illinois, United States §

Westville experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Westville UV Index data.

Average daily maximum UV levels by month for Westville, Illinois, United States.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) 3 5 6 9 10 11 10 9 8 6 4 3