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Monthly climate in Thayer, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Thayer features a humid continental climate (Dfa).Temperatures typically range between -1 °C (30 °F) and 25 °C (78 °F) through the year, but rarely can drop to -25 °C (-12 °F) or can rise to as high as 36 °C (97 °F).The average annual precipitation amounts to about 1178 mm (46.4 inches) and receives 114 rainy days on the 1 mm (0.04 inches) threshold annually.Thayer enjoys an average of 2978 hours of sunshine throughout the year, and daylight varies from 9 hours 24 minutes to 14 hours 53 minutes per day.

Monthly average temperatures in Thayer, Illinois, United States §

The warmest months in Thayer are June, July and August, with daily mean temperatures ranging from 23 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 -1 to 3 °C (30 - 37 °F) throughout the day. On average each year, Thayer experiences 112 days above 25 °C (77.0 °F) and 90 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Thayer, 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 17°C
(64°F)		 23°C
(74°F)		 25°C
(77°F)		 29°C
(84°F)		 34°C
(94°F)		 35°C
(96°F)		 36°C
(97°F)		 34°C
(93°F)		 34°C
(93°F)		 32°C
(91°F)		 24°C
(75°F)		 19°C
(67°F)
Mean maximum 15°C
(59°F)		 18°C
(65°F)		 22°C
(71°F)		 28°C
(83°F)		 32°C
(89°F)		 33°C
(92°F)		 34°C
(94°F)		 33°C
(91°F)		 33°C
(91°F)		 31°C
(87°F)		 20°C
(69°F)		 18°C
(65°F)
Average high 3°C
(37°F)		 5°C
(41°F)		 12°C
(54°F)		 17°C
(63°F)		 24°C
(75°F)		 29°C
(84°F)		 30°C
(86°F)		 28°C
(83°F)		 27°C
(82°F)		 20°C
(67°F)		 11°C
(51°F)		 7°C
(46°F)
Daily mean -1°C
(30°F)		 0°C
(33°F)		 7°C
(44°F)		 12°C
(53°F)		 19°C
(66°F)		 24°C
(75°F)		 25°C
(78°F)		 23°C
(75°F)		 22°C
(71°F)		 14°C
(58°F)		 6°C
(42°F)		 3°C
(37°F)
Average low -5°C
(23°F)		 -5°C
(24°F)		 2°C
(36°F)		 6°C
(44°F)		 14°C
(57°F)		 19°C
(66°F)		 21°C
(69°F)		 19°C
(66°F)		 16°C
(61°F)		 9°C
(49°F)		 1°C
(34°F)		 -2°C
(29°F)
Mean minimum -18°C
(-0°F)		 -18°C
(1°F)		 -10°C
(15°F)		 -2°C
(29°F)		 5°C
(41°F)		 14°C
(57°F)		 15°C
(60°F)		 13°C
(55°F)		 8°C
(47°F)		 -1°C
(31°F)		 -8°C
(18°F)		 -12°C
(11°F)
Minimum -25°C
(-12°F)		 -22°C
(-8°F)		 -18°C
(1°F)		 -6°C
(21°F)		 2°C
(35°F)		 11°C
(52°F)		 14°C
(57°F)		 12°C
(54°F)		 6°C
(42°F)		 -4°C
(24°F)		 -13°C
(8°F)		 -19°C
(-2°F)

Compare climate in Thayer with other places

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

Monthly average precipitation in Thayer, Illinois, United States §

Thayer usually has the most precipitation in March, April and May, with an average of 12 rainy days and 139 mm (5.5 inches) of precipitation per month.The driest months in Thayer are September, November and December. On average, 62 mm (2.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Thayer, 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) 68 (2.7) 72 (2.8) 133 (5.2) 133 (5.2) 150 (5.9) 119 (4.7) 110 (4.3) 102 (4.0) 68 (2.7) 103 (4.1) 68 (2.7) 51 (2.0)
Average precipitation days (≥ 1 mm) 7 9 11 11 14 11 10 10 6 10 8 7

Monthly sunshine hours in Thayer, Illinois, United States §

The sunniest months in Thayer are June, July and August, when the sun shines an average of 11 hours 5 minutes a day.Least sunny months in Thayer: January, February and December receive an average of 5 hours 20 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Thayer, 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 119 171 209 241 285 339 351 330 293 236 205 194
Mean daily daylight hours 9h 43m 10h 43m 11h 58m 13h 16m 14h 21m 14h 53m 14h 36m 13h 38m 12h 23m 11h 6m 9h 59m 9h 24m

Solar UV radiation in Thayer, Illinois, United States §

Thayer 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 Thayer UV Index data.

Average daily maximum UV levels by month for Thayer, 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 9 10 11 11 9 8 6 4 3