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Monthly climate in Andover, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Andover features a humid continental climate (Dfa).Temperatures typically range between -4 °C (25 °F) and 25 °C (77 °F) through the year, but rarely can drop to -33 °C (-27 °F) or can rise to as high as 36 °C (96 °F).The average annual precipitation amounts to about 1133 mm (44.6 inches) and receives 119 rainy days on the 1 mm (0.04 inches) threshold annually.Andover enjoys an average of 2972 hours of sunshine throughout the year, and daylight varies from 9 hours 13 minutes to 15 hours 5 minutes per day.

Monthly average temperatures in Andover, Illinois, United States §

The warmest months in Andover are June, July and August, with daily mean temperatures ranging from 23 to 25 °C (74 - 77 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -4 to 0 °C (25 - 33 °F) throughout the day. On average each year, Andover experiences 96 days above 25 °C (77.0 °F) and 108 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Andover, 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 13°C
(55°F)		 21°C
(70°F)		 24°C
(76°F)		 28°C
(83°F)		 35°C
(95°F)		 34°C
(94°F)		 36°C
(96°F)		 34°C
(94°F)		 34°C
(93°F)		 31°C
(89°F)		 24°C
(75°F)		 21°C
(70°F)
Mean maximum 11°C
(51°F)		 14°C
(58°F)		 20°C
(68°F)		 26°C
(80°F)		 31°C
(89°F)		 33°C
(91°F)		 34°C
(93°F)		 33°C
(91°F)		 32°C
(90°F)		 30°C
(85°F)		 18°C
(64°F)		 16°C
(62°F)
Average high -0°C
(32°F)		 2°C
(36°F)		 9°C
(49°F)		 15°C
(59°F)		 22°C
(72°F)		 28°C
(82°F)		 29°C
(85°F)		 28°C
(83°F)		 26°C
(79°F)		 17°C
(63°F)		 8°C
(47°F)		 5°C
(41°F)
Daily mean -4°C
(25°F)		 -3°C
(27°F)		 5°C
(41°F)		 10°C
(50°F)		 17°C
(63°F)		 23°C
(74°F)		 25°C
(77°F)		 23°C
(74°F)		 20°C
(69°F)		 12°C
(55°F)		 4°C
(39°F)		 0°C
(33°F)
Average low -8°C
(18°F)		 -7°C
(19°F)		 0°C
(33°F)		 5°C
(41°F)		 12°C
(54°F)		 18°C
(65°F)		 20°C
(68°F)		 18°C
(64°F)		 15°C
(59°F)		 8°C
(46°F)		 -1°C
(31°F)		 -4°C
(26°F)
Mean minimum -22°C
(-8°F)		 -21°C
(-6°F)		 -11°C
(12°F)		 -4°C
(25°F)		 4°C
(39°F)		 13°C
(56°F)		 15°C
(60°F)		 12°C
(55°F)		 7°C
(46°F)		 -2°C
(29°F)		 -10°C
(13°F)		 -14°C
(7°F)
Minimum -31°C
(-24°F)		 -33°C
(-27°F)		 -19°C
(-3°F)		 -9°C
(17°F)		 -1°C
(31°F)		 10°C
(50°F)		 14°C
(57°F)		 12°C
(53°F)		 5°C
(41°F)		 -5°C
(23°F)		 -16°C
(4°F)		 -22°C
(-6°F)

Compare climate in Andover with other places

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

Monthly average precipitation in Andover, Illinois, United States §

Andover usually has the most precipitation in May, June and October, with an average of 13 rainy days and 142 mm (5.6 inches) of precipitation per month.The driest months in Andover are January, November and December. On average, 52 mm (2.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Andover, 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) 56 (2.2) 63 (2.5) 100 (3.9) 113 (4.5) 157 (6.2) 143 (5.6) 100 (3.9) 70 (2.7) 103 (4.1) 127 (5.0) 52 (2.0) 49 (1.9)
Average precipitation days (≥ 1 mm) 7 10 10 12 15 12 11 8 9 12 7 6

Monthly sunshine hours in Andover, Illinois, United States §

The sunniest months in Andover are June, July and August, when the sun shines an average of 11 hours 8 minutes a day.Least sunny months in Andover: January, February and November receive an average of 5 hours 41 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Andover, 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 127 184 223 237 271 333 356 334 280 222 199 200
Mean daily daylight hours 9h 34m 10h 37m 11h 58m 13h 21m 14h 31m 15h 5m 14h 46m 13h 44m 12h 24m 11h 2m 9h 50m 9h 13m

Solar UV radiation in Andover, Illinois, United States §

Andover experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 11, which corresponds to the Very High / Extreme 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 4. For more detailed information, check out our hourly Andover UV Index data.

Average daily maximum UV levels by month for Andover, 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 8 9 11 10 9 8 6 4 2