Illinois, United States Climate

Weather: 5.45°C/41.81°F, Wind SW at 0.45 km/h, 93% Humidity, 0% Chance of rain

United States
(Photo by Dayne Topkin on Unsplash)

Illinois Climate Summary

Located at an elevation of 251.72 meters (825.85 feet) above sea level, Illinois has a Humid continental, no dry season, hot summer climate (Classification: Dfa). The city’s yearly temperature is 12.07ºC (53.73ºF) and it is -0.57% lower than United States’s averages. Illinois typically receives about 38.16 millimeters (1.5 inches) of precipitation and has 87.73 rainy days (24.04% of the time) annually.

CountryUnited States
Longitude-89.3985283
Latitude40.6331249
Attitude/Elevation251.72m (825.85ft)
Local timeWednesday 08:24
Annual high temperature15.14ºC (59.25ºF)
Annual low temperature6.9ºC (44.42ºF)
Average annual precip.38.16mm (1.5in)
Warmest monthJuly (27.72ºC / 81.9ºF)
Coldest MonthJanuary (-7.09ºC / 19.24ºF)
Wettest MonthMay (71.99mm / 2.83in)
Driest MonthDecember (17.82mm / 0.7in)
Number of days with rainfall (≥ 1.0 mm)87.73 days (24.04%)
Days with no rain277.27 days (75.96%)
Humidity77.51%

Climate Illinois: Monthly Averages

MonthJanFebMarAprMayJunJulAugSepNovOctDecYear
Record high °C (°F)17.0(62.6)20.0(68.0)27.0(80.6)28.0(82.4)34.0(93.2)34.0(93.2)35.0(95.0)35.0(95.0)35.0(95.0)30.0(86.0)25.0(77.0)19.0(66.2)35.0(95.0)
Average high °C (°F)-1.0(30.2)1.4(34.52)9.03(48.25)15.53(59.95)22.0(71.6)26.49(79.68)27.72(81.9)27.14(80.85)24.45(76.01)17.23(63.01)8.89(48.0)2.76(36.97)15.14(59.25)
Daily mean °C (°F)-3.43(25.83)-1.4(29.48)5.82(42.48)12.19(53.94)18.93(66.07)23.53(74.35)24.9(76.82)23.77(74.79)20.48(68.86)13.62(56.52)5.93(42.67)0.48(32.86)12.07(53.73)
Average low °C (°F)-7.09(19.24)-5.63(21.87)1.17(34.11)6.66(43.99)13.0(55.4)17.26(63.07)18.69(65.64)17.47(63.45)14.28(57.7)8.28(46.9)1.57(34.83)-2.82(26.92)6.9(44.42)
Record low °C (°F)-30.0(-22.0)-22.0(-7.6)-22.0(-7.6)-7.0(19.4)1.0(33.8)7.0(44.6)8.0(46.4)6.0(42.8)1.0(33.8)-5.0(23.0)-15.0(5.0)-20.0(-4.0)-30.0(-22.0)
Average precipitation mm (inches)27.18(1.07)22.3(0.88)36.54(1.44)55.62(2.19)71.99(2.83)58.49(2.3)42.36(1.67)34.48(1.36)43.73(1.72)25.49(1.0)21.96(0.86)17.82(0.7)38.16(1.5)
Average precipitation days (≥ 1.0 mm)3.824.736.459.012.6410.5510.917.737.096.364.454.07.31
Average relative humidity (%)80.8879.8374.9973.3377.3880.8884.7282.5275.8569.3571.9678.3777.51
Mean monthly sunshine hours5.936.469.2311.712.6813.4213.3712.8511.437.896.946.279.85

Climate Graph

The chart below shows the mean monthly temperature and precipitation of Illinois in recent years.

Illinois

Illinois Temperature by Month

July
24.9°C | 76.82°F
August
23.77°C | 74.79°F
June
23.53°C | 74.35°F
September
20.48°C | 68.86°F
May
18.93°C | 66.07°F
October
13.62°C | 56.52°F
April
12.19°C | 53.94°F
November
5.93°C | 42.67°F
March
5.82°C | 42.48°F
December
0.48°C | 32.86°F
February
-1.4°C | 29.48°F
January
-3.43°C | 25.83°F

Historical Data

Summary
  • 2010
  • 2011
  • 2012
  • 2013
  • 2014
  • 2015
  • 2016
  • 2017
  • 2018
  • 2019
  • 2020
  • January
  • February
  • March
  • April
  • May
  • June
  • July
  • August
  • September
  • October
  • November
  • December
TemperatureMaxAverageMin
Max Temperature9.0°C (48.2°F)0.72°C (33.3°F)-11.0°C (12.2°F)
Avg Temperature6.0°C (42.8°F)-1.62°C (29.08°F)-13.0°C (8.6°F)
Min Temperature1.0°C (33.8°F)-5.24°C (22.57°F)-17.0°C (1.4°F)
Dew PointMaxAverageMin
Dew Point3.0°C (37.4°F)-5.31°C (22.44°F)-16.0°C (3.2°F)
PrecipitationMaxAverageMinSum
Precipitation10.2mm | 0.4in1.61mm | 0.06in0.0mm | 0in46.6mm | 1.83in
Snowdepth6.0mm | 0.24in0.53mm | 0.02in0.0mm | 0in15.4mm | 0.61in
WindMaxAverageMin
Wind29.0kmh | 18.02mph16.41kmh | 10.2mph7.0kmh | 4.35mph
Gust Wind37.0kmh | 22.99mph23.97kmh | 14.89mph12.0kmh | 7.46mph
Sea Level PressureMaxAverageMin
Sea Level Pressure10.2mb1.61mb0.0mb
Illinois

Daily Observations

TimeTemperatureDew PointHumidityWind SpeedPressurePrecipitation
February° C | ° F° C | ° F%Kph | MphHg | MbTotal (mm/in)
2020-02-011 | 33.80 | 32.09413 | 8.0830.0 | 10161.5 | 0.06
2020-02-025 | 41.01 | 33.88316 | 9.9429.8 | 10090.0 | 0.0
2020-02-036 | 42.83 | 37.48611 | 6.8429.74 | 10070.2 | 0.01
2020-02-04-0 | 32.0-3 | 26.67926 | 16.1629.91 | 10130.5 | 0.02
2020-02-05-2 | 28.4-6 | 21.27724 | 14.9129.97 | 10156.6 | 0.26
2020-02-06-3 | 26.6-4 | 24.89218 | 11.1829.62 | 10032.7 | 0.11
2020-02-07-3 | 26.6-7 | 19.47810 | 6.2129.8 | 10090.0 | 0.0
2020-02-08-3 | 26.6-4 | 24.89110 | 6.2130.12 | 10202.3 | 0.09
2020-02-09-1 | 30.2-2 | 28.49119 | 11.8130.09 | 10193.0 | 0.12
2020-02-10-1 | 30.2-3 | 26.68411 | 6.8430.18 | 10220.0 | 0.0
2020-02-11-0 | 32.0-5 | 23.07612 | 7.4630.18 | 10220.0 | 0.0
2020-02-120 | 32.0-3 | 26.68210 | 6.2130.0 | 10167.0 | 0.28
2020-02-13-11 | 12.2-10 | 14.08923 | 14.2930.12 | 10202.7 | 0.11
2020-02-14-13 | 8.6-16 | 3.28211 | 6.8430.59 | 10360.0 | 0.0
2020-02-15-4 | 24.8-7 | 19.48423 | 14.2930.21 | 10230.1 | 0.0
2020-02-16-1 | 30.2-2 | 28.4937 | 4.3530.15 | 10210.0 | 0.0
2020-02-173 | 37.41 | 33.89517 | 10.5629.94 | 10146.7 | 0.26
2020-02-181 | 33.8-1 | 30.28718 | 11.1830.12 | 10200.1 | 0.0
2020-02-19-5 | 23.0-12 | 10.46116 | 9.9430.59 | 10360.0 | 0.0
2020-02-20-7 | 19.4-15 | 5.05316 | 9.9430.71 | 10400.0 | 0.0
2020-02-21-3 | 26.6-16 | 3.24013 | 8.0830.59 | 10360.0 | 0.0
2020-02-223 | 37.4-6 | 21.25819 | 11.8130.27 | 10250.0 | 0.0
2020-02-235 | 41.01 | 33.88116 | 9.9430.03 | 10170.1 | 0.0
2020-02-242 | 35.62 | 35.69216 | 9.9429.83 | 101010.2 | 0.4
2020-02-253 | 37.42 | 35.69516 | 9.9429.74 | 10072.6 | 0.1
2020-02-26-3 | 26.6-7 | 19.47629 | 18.0229.91 | 10130.3 | 0.01
2020-02-27-8 | 17.6-15 | 5.06024 | 14.9130.18 | 10220.0 | 0.0
2020-02-28-8 | 17.6-14 | 6.86219 | 11.8130.33 | 10270.0 | 0.0
2020-02-29-0 | 32.0-6 | 21.26713 | 8.0830.18 | 10220.0 | 0.0

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