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Monthly climate in Anna, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Anna features a humid subtropical climate (Cfa).Temperatures typically range between 2 °C (36 °F) and 27 °C (80 °F) through the year, but rarely can drop to -18 °C (-1 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 1348 mm (53.1 inches) and receives 124 rainy days on the 1 mm (0.04 inches) threshold annually.Anna enjoys an average of 2990 hours of sunshine throughout the year, and daylight varies from 9 hours 36 minutes to 14 hours 41 minutes per day.

Monthly average temperatures in Anna, Illinois, United States §

The warmest months in Anna are June, July and August, with daily mean temperatures ranging from 25 to 27 °C (77 - 80 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 2 to 5 °C (36 - 42 °F) throughout the day. On average each year, Anna experiences 125 days above 25 °C (77.0 °F) and 62 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Anna, 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 21°C
(70°F)		 24°C
(75°F)		 26°C
(79°F)		 30°C
(86°F)		 33°C
(91°F)		 35°C
(96°F)		 36°C
(97°F)		 36°C
(97°F)		 36°C
(97°F)		 34°C
(94°F)		 26°C
(79°F)		 23°C
(73°F)
Mean maximum 17°C
(63°F)		 20°C
(69°F)		 24°C
(76°F)		 28°C
(82°F)		 31°C
(88°F)		 34°C
(93°F)		 35°C
(95°F)		 34°C
(94°F)		 34°C
(93°F)		 31°C
(88°F)		 22°C
(72°F)		 20°C
(68°F)
Average high 6°C
(43°F)		 9°C
(48°F)		 15°C
(59°F)		 19°C
(66°F)		 25°C
(77°F)		 29°C
(85°F)		 31°C
(89°F)		 30°C
(86°F)		 28°C
(83°F)		 21°C
(71°F)		 13°C
(55°F)		 10°C
(50°F)
Daily mean 2°C
(36°F)		 4°C
(39°F)		 9°C
(49°F)		 14°C
(57°F)		 20°C
(68°F)		 25°C
(77°F)		 27°C
(80°F)		 25°C
(77°F)		 23°C
(73°F)		 16°C
(61°F)		 8°C
(46°F)		 5°C
(42°F)
Average low -2°C
(29°F)		 -1°C
(31°F)		 5°C
(41°F)		 8°C
(48°F)		 16°C
(60°F)		 20°C
(69°F)		 22°C
(72°F)		 20°C
(69°F)		 18°C
(64°F)		 11°C
(52°F)		 2°C
(37°F)		 1°C
(34°F)
Mean minimum -12°C
(10°F)		 -13°C
(9°F)		 -6°C
(21°F)		 0°C
(32°F)		 7°C
(45°F)		 15°C
(60°F)		 18°C
(65°F)		 15°C
(59°F)		 10°C
(50°F)		 1°C
(34°F)		 -6°C
(21°F)		 -8°C
(17°F)
Minimum -18°C
(0°F)		 -18°C
(-1°F)		 -13°C
(9°F)		 -3°C
(28°F)		 4°C
(39°F)		 12°C
(54°F)		 16°C
(62°F)		 13°C
(56°F)		 8°C
(47°F)		 -1°C
(30°F)		 -11°C
(12°F)		 -14°C
(7°F)

Compare climate in Anna with other places

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

Monthly average precipitation in Anna, Illinois, United States §

Anna usually has the most precipitation in March, April and May, with an average of 12 rainy days and 149 mm (5.8 inches) of precipitation per month.The driest months in Anna are September, November and December. On average, 85 mm (3.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Anna, 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) 102 (4.0) 123 (4.8) 155 (6.1) 143 (5.6) 148 (5.8) 100 (3.9) 96 (3.8) 96 (3.8) 72 (2.9) 129 (5.1) 96 (3.8) 87 (3.4)
Average precipitation days (≥ 1 mm) 8 12 13 12 13 10 10 12 8 9 9 8

Monthly sunshine hours in Anna, Illinois, United States §

The sunniest months in Anna are June, July and August, when the sun shines an average of 10 hours 51 minutes a day.Least sunny months in Anna: January, February and December receive an average of 5 hours 27 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Anna, 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 130 176 204 250 290 327 348 321 291 244 214 188
Mean daily daylight hours 9h 53m 10h 48m 11h 59m 13h 11m 14h 12m 14h 41m 14h 25m 13h 31m 12h 22m 11h 10m 10h 7m 9h 36m

Solar UV radiation in Anna, Illinois, United States §

Anna experiences the highest level of ultraviolet (UV) radiation in April, May and June, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, February and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Anna UV Index data.

Average daily maximum UV levels by month for Anna, 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 7 10 11 11 10 10 9 7 5 3