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Monthly climate in Oreana, Illinois, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Oreana features a humid continental climate (Dfa).Temperatures typically range between -2 °C (29 °F) and 25 °C (77 °F) through the year, but rarely can drop to -27 °C (-17 °F) or can rise to as high as 35 °C (96 °F).The average annual precipitation amounts to about 1179 mm (46.4 inches) and receives 125 rainy days on the 1 mm (0.04 inches) threshold annually.Oreana enjoys an average of 2939 hours of sunshine throughout the year, and daylight varies from 9 hours 22 minutes to 14 hours 56 minutes per day.

Monthly average temperatures in Oreana, Illinois, United States §

The warmest months in Oreana 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 -2 to 2 °C (29 - 36 °F) throughout the day. On average each year, Oreana experiences 110 days above 25 °C (77.0 °F) and 96 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Oreana, 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
(73°F)		 26°C
(79°F)		 29°C
(84°F)		 34°C
(93°F)		 35°C
(96°F)		 35°C
(94°F)		 34°C
(93°F)		 34°C
(94°F)		 32°C
(90°F)		 25°C
(77°F)		 19°C
(66°F)
Mean maximum 14°C
(58°F)		 17°C
(63°F)		 21°C
(71°F)		 28°C
(82°F)		 31°C
(89°F)		 33°C
(91°F)		 33°C
(92°F)		 33°C
(91°F)		 32°C
(91°F)		 30°C
(87°F)		 20°C
(68°F)		 17°C
(64°F)
Average high 2°C
(36°F)		 4°C
(40°F)		 11°C
(52°F)		 17°C
(62°F)		 23°C
(74°F)		 29°C
(84°F)		 30°C
(86°F)		 28°C
(83°F)		 27°C
(81°F)		 19°C
(67°F)		 10°C
(50°F)		 7°C
(44°F)
Daily mean -2°C
(29°F)		 -0°C
(31°F)		 6°C
(43°F)		 11°C
(52°F)		 18°C
(65°F)		 24°C
(75°F)		 25°C
(77°F)		 23°C
(74°F)		 21°C
(71°F)		 14°C
(57°F)		 5°C
(42°F)		 2°C
(36°F)
Average low -6°C
(21°F)		 -5°C
(23°F)		 1°C
(34°F)		 6°C
(43°F)		 13°C
(56°F)		 18°C
(65°F)		 20°C
(69°F)		 18°C
(65°F)		 16°C
(61°F)		 9°C
(48°F)		 0°C
(33°F)		 -2°C
(28°F)
Mean minimum -20°C
(-3°F)		 -19°C
(-1°F)		 -10°C
(14°F)		 -3°C
(27°F)		 4°C
(39°F)		 13°C
(56°F)		 15°C
(59°F)		 12°C
(55°F)		 8°C
(47°F)		 -1°C
(31°F)		 -8°C
(17°F)		 -13°C
(10°F)
Minimum -27°C
(-17°F)		 -22°C
(-8°F)		 -18°C
(0°F)		 -7°C
(19°F)		 0°C
(32°F)		 10°C
(50°F)		 13°C
(56°F)		 11°C
(53°F)		 6°C
(42°F)		 -5°C
(23°F)		 -13°C
(9°F)		 -20°C
(-4°F)

Compare climate in Oreana with other places

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

Monthly average precipitation in Oreana, Illinois, United States §

Oreana usually has the most precipitation in March, April and May, with an average of 12 rainy days and 133 mm (5.2 inches) of precipitation per month.The driest months in Oreana are September, November and December. On average, 67 mm (2.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Oreana, 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) 76 (3.0) 77 (3.0) 123 (4.8) 127 (5.0) 148 (5.8) 109 (4.3) 100 (3.9) 99 (3.9) 75 (2.9) 120 (4.7) 72 (2.8) 54 (2.1)
Average precipitation days (≥ 1 mm) 9 10 12 11 15 11 11 10 7 12 9 8

Monthly sunshine hours in Oreana, Illinois, United States §

The sunniest months in Oreana are June, July and August, when the sun shines an average of 11 hours 4 minutes a day.Least sunny months in Oreana: January, February and December receive an average of 5 hours 11 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Oreana, 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 116 166 212 238 284 336 352 330 290 228 194 189
Mean daily daylight hours 9h 41m 10h 41m 11h 58m 13h 17m 14h 23m 14h 56m 14h 38m 13h 39m 12h 23m 11h 5m 9h 57m 9h 22m

Solar UV radiation in Oreana, Illinois, United States §

Oreana 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 Oreana UV Index data.

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