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Monthly climate in Grayville, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Grayville features a humid subtropical climate (Cfa).Temperatures typically range between 1 °C (35 °F) and 27 °C (80 °F) through the year, but rarely can drop to -18 °C (0 °F) or can rise to as high as 36 °C (98 °F).The average annual precipitation amounts to about 1234 mm (48.6 inches) and receives 121 rainy days on the 1 mm (0.04 inches) threshold annually.Grayville enjoys an average of 2986 hours of sunshine throughout the year, and daylight varies from 9 hours 32 minutes to 14 hours 45 minutes per day.

Monthly average temperatures in Grayville, Illinois, United States §

The warmest months in Grayville 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 1 to 5 °C (35 - 41 °F) throughout the day. On average each year, Grayville experiences 124 days above 25 °C (77.0 °F) and 67 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Grayville, 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
(69°F)		 24°C
(75°F)		 25°C
(77°F)		 30°C
(86°F)		 33°C
(92°F)		 36°C
(97°F)		 36°C
(98°F)		 35°C
(96°F)		 34°C
(93°F)		 35°C
(95°F)		 26°C
(80°F)		 22°C
(71°F)
Mean maximum 17°C
(63°F)		 20°C
(68°F)		 23°C
(74°F)		 28°C
(83°F)		 32°C
(90°F)		 34°C
(93°F)		 35°C
(95°F)		 34°C
(93°F)		 33°C
(91°F)		 31°C
(89°F)		 22°C
(72°F)		 19°C
(67°F)
Average high 5°C
(42°F)		 8°C
(47°F)		 14°C
(57°F)		 19°C
(66°F)		 25°C
(77°F)		 30°C
(86°F)		 31°C
(88°F)		 30°C
(86°F)		 28°C
(83°F)		 21°C
(71°F)		 12°C
(54°F)		 9°C
(49°F)
Daily mean 1°C
(35°F)		 3°C
(38°F)		 9°C
(48°F)		 13°C
(57°F)		 20°C
(69°F)		 25°C
(77°F)		 27°C
(80°F)		 25°C
(77°F)		 23°C
(73°F)		 16°C
(61°F)		 7°C
(45°F)		 5°C
(41°F)
Average low -3°C
(28°F)		 -1°C
(30°F)		 4°C
(39°F)		 8°C
(47°F)		 15°C
(60°F)		 20°C
(68°F)		 22°C
(72°F)		 20°C
(69°F)		 17°C
(63°F)		 11°C
(52°F)		 2°C
(36°F)		 0°C
(33°F)
Mean minimum -14°C
(7°F)		 -14°C
(7°F)		 -7°C
(19°F)		 -1°C
(30°F)		 5°C
(42°F)		 15°C
(59°F)		 17°C
(62°F)		 14°C
(58°F)		 9°C
(48°F)		 1°C
(35°F)		 -7°C
(20°F)		 -9°C
(15°F)
Minimum -18°C
(0°F)		 -17°C
(1°F)		 -13°C
(9°F)		 -4°C
(25°F)		 2°C
(37°F)		 11°C
(52°F)		 16°C
(60°F)		 13°C
(55°F)		 8°C
(46°F)		 -2°C
(28°F)		 -12°C
(11°F)		 -16°C
(4°F)

Compare climate in Grayville with other places

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

Monthly average precipitation in Grayville, Illinois, United States §

Grayville usually has the most precipitation in March, April and May, with an average of 12 rainy days and 129 mm (5.1 inches) of precipitation per month.The driest months in Grayville are July, August and September. On average, 77 mm (3.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Grayville, 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) 140 (5.5) 117 (4.6) 131 (5.1) 116 (4.6) 76 (3.0) 83 (3.3) 71 (2.8) 104 (4.1) 94 (3.7) 95 (3.7)
Average precipitation days (≥ 1 mm) 8 11 12 11 15 10 9 10 7 10 9 9

Monthly sunshine hours in Grayville, Illinois, United States §

The sunniest months in Grayville are June, July and August, when the sun shines an average of 10 hours 59 minutes a day.Least sunny months in Grayville: January, February and December receive an average of 5 hours 15 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Grayville, 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 124 167 210 253 285 331 357 323 293 244 209 187
Mean daily daylight hours 9h 50m 10h 47m 11h 58m 13h 12m 14h 14m 14h 45m 14h 28m 13h 33m 12h 22m 11h 9m 10h 5m 9h 32m

Solar UV radiation in Grayville, Illinois, United States §

Grayville 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 Grayville UV Index data.

Average daily maximum UV levels by month for Grayville, 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 10 9 9 7 4 3