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Monthly climate in Grand Tower, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Grand Tower features a humid subtropical climate (Cfa).Temperatures typically range between 2 °C (35 °F) and 27 °C (80 °F) through the year, but rarely can drop to -19 °C (-1 °F) or can rise to as high as 37 °C (100 °F).The average annual precipitation amounts to about 1275 mm (50.2 inches) and receives 121 rainy days on the 1 mm (0.04 inches) threshold annually.Grand Tower enjoys an average of 2983 hours of sunshine throughout the year, and daylight varies from 9 hours 35 minutes to 14 hours 42 minutes per day.

Monthly average temperatures in Grand Tower, Illinois, United States §

The warmest months in Grand Tower 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 (35 - 41 °F) throughout the day. On average each year, Grand Tower experiences 125 days above 25 °C (77.0 °F) and 65 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Grand Tower, 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)		 25°C
(76°F)		 26°C
(79°F)		 31°C
(87°F)		 33°C
(91°F)		 36°C
(96°F)		 37°C
(100°F)		 36°C
(97°F)		 35°C
(96°F)		 35°C
(95°F)		 25°C
(78°F)		 23°C
(74°F)
Mean maximum 17°C
(63°F)		 21°C
(69°F)		 24°C
(76°F)		 28°C
(82°F)		 31°C
(89°F)		 34°C
(93°F)		 36°C
(97°F)		 34°C
(94°F)		 33°C
(92°F)		 32°C
(89°F)		 23°C
(73°F)		 20°C
(69°F)
Average high 6°C
(43°F)		 8°C
(47°F)		 14°C
(58°F)		 19°C
(66°F)		 25°C
(77°F)		 30°C
(86°F)		 32°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
(35°F)		 3°C
(38°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)		 7°C
(46°F)		 5°C
(41°F)
Average low -2°C
(28°F)		 -1°C
(30°F)		 4°C
(40°F)		 8°C
(47°F)		 15°C
(60°F)		 20°C
(69°F)		 22°C
(73°F)		 20°C
(69°F)		 17°C
(64°F)		 11°C
(51°F)		 2°C
(37°F)		 1°C
(33°F)
Mean minimum -13°C
(9°F)		 -13°C
(8°F)		 -7°C
(20°F)		 -0°C
(32°F)		 7°C
(44°F)		 15°C
(60°F)		 18°C
(64°F)		 15°C
(59°F)		 9°C
(49°F)		 1°C
(33°F)		 -6°C
(21°F)		 -9°C
(17°F)
Minimum -18°C
(-0°F)		 -19°C
(-1°F)		 -14°C
(7°F)		 -3°C
(28°F)		 3°C
(38°F)		 12°C
(53°F)		 16°C
(61°F)		 14°C
(57°F)		 8°C
(47°F)		 -2°C
(28°F)		 -12°C
(11°F)		 -14°C
(7°F)

Compare climate in Grand Tower with other places

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

Monthly average precipitation in Grand Tower, Illinois, United States §

Grand Tower usually has the most precipitation in March, April and May, with an average of 12 rainy days and 146 mm (5.7 inches) of precipitation per month.The driest months in Grand Tower are June, September and December. On average, 81 mm (3.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Grand Tower, 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) 95 (3.7) 111 (4.4) 143 (5.6) 150 (5.9) 145 (5.7) 88 (3.5) 89 (3.5) 94 (3.7) 74 (2.9) 115 (4.5) 89 (3.5) 82 (3.2)
Average precipitation days (≥ 1 mm) 8 11 13 12 13 11 9 11 7 9 9 8

Monthly sunshine hours in Grand Tower, Illinois, United States §

The sunniest months in Grand Tower are June, July and August, when the sun shines an average of 10 hours 50 minutes a day.Least sunny months in Grand Tower: 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 Grand Tower, 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 129 176 203 247 289 326 348 322 290 243 215 189
Mean daily daylight hours 9h 53m 10h 48m 11h 59m 13h 11m 14h 12m 14h 42m 14h 26m 13h 31m 12h 22m 11h 10m 10h 7m 9h 35m

Solar UV radiation in Grand Tower, Illinois, United States §

Grand Tower experiences the highest level of ultraviolet (UV) radiation in May, June and August, 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 5. For more detailed information, check out our hourly Grand Tower UV Index data.

Average daily maximum UV levels by month for Grand Tower, 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 6 7 9 11 11 10 10 9 7 5 3