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Climate & Weather Averages in Illiana, Illinois, USA

Currently: 87 °F. Sunny. (Weather station: Purdue University Airport, USA). See more current weather

Annual Weather Averages in Purdue University Airport

Purdue University Airport is 35 miles from Illiana, so the actual climate in Illiana can vary a bit.

Based on weather reports collected during 1992–2021.

Jan
35
20
2.2
Feb
39
22
1.89
Mar
51
31
2.87
Apr
63
41
3.86
May
74
51
4.16
Jun
83
61
4.73
Jul
85
64
4.25
Aug
84
63
3.07
Sep
79
55
2.7
Oct
66
44
3.05
Nov
51
33
2.81
Dec
40
25
2.46

All Year Climate & Weather Averages in Illiana

High Temp: 85 °F

Low Temp: 20 °F

Mean Temp: 52 °F

Precipitation: 3.17"

Humidity: 71%

Dew Point: 43 °F

Wind: 13 mph

Pressure: 30.04 "Hg

Visibility: 9 mi

January Climate & Weather Averages in Illiana

High Temp: 35 °F

Low Temp: 20 °F

Mean Temp: 27 °F

Precipitation: 2.20"

Humidity: 77%

Dew Point: 21 °F

Wind: 16 mph

Pressure: 30.12 "Hg

Visibility: 8 mi

February Climate & Weather Averages in Illiana

High Temp: 39 °F

Low Temp: 22 °F

Mean Temp: 31 °F

Precipitation: 1.89"

Humidity: 74%

Dew Point: 23 °F

Wind: 15 mph

Pressure: 30.11 "Hg

Visibility: 8 mi

March Climate & Weather Averages in Illiana

High Temp: 51 °F

Low Temp: 31 °F

Mean Temp: 41 °F

Precipitation: 2.87"

Humidity: 67%

Dew Point: 30 °F

Wind: 15 mph

Pressure: 30.08 "Hg

Visibility: 9 mi

April Climate & Weather Averages in Illiana

High Temp: 63 °F

Low Temp: 41 °F

Mean Temp: 52 °F

Precipitation: 3.86"

Humidity: 64%

Dew Point: 40 °F

Wind: 16 mph

Pressure: 29.98 "Hg

Visibility: 9 mi

May Climate & Weather Averages in Illiana

High Temp: 74 °F

Low Temp: 51 °F

Mean Temp: 63 °F

Precipitation: 4.16"

Humidity: 67%

Dew Point: 51 °F

Wind: 12 mph

Pressure: 29.98 "Hg

Visibility: 9 mi

June Climate & Weather Averages in Illiana

High Temp: 83 °F

Low Temp: 61 °F

Mean Temp: 72 °F

Precipitation: 4.73"

Humidity: 69%

Dew Point: 61 °F

Wind: 10 mph

Pressure: 29.95 "Hg

Visibility: 9 mi

July Climate & Weather Averages in Illiana

High Temp: 85 °F

Low Temp: 64 °F

Mean Temp: 74 °F

Precipitation: 4.25"

Humidity: 74%

Dew Point: 65 °F

Wind: 9 mph

Pressure: 29.98 "Hg

Visibility: 8 mi

August Climate & Weather Averages in Illiana

High Temp: 84 °F

Low Temp: 63 °F

Mean Temp: 73 °F

Precipitation: 3.07"

Humidity: 74%

Dew Point: 64 °F

Wind: 8 mph

Pressure: 30.01 "Hg

Visibility: 8 mi

September Climate & Weather Averages in Illiana

High Temp: 79 °F

Low Temp: 55 °F

Mean Temp: 67 °F

Precipitation: 2.70"

Humidity: 70%

Dew Point: 56 °F

Wind: 9 mph

Pressure: 30.04 "Hg

Visibility: 9 mi

October Climate & Weather Averages in Illiana

High Temp: 66 °F

Low Temp: 44 °F

Mean Temp: 55 °F

Precipitation: 3.05"

Humidity: 69%

Dew Point: 44 °F

Wind: 12 mph

Pressure: 30.06 "Hg

Visibility: 9 mi

November Climate & Weather Averages in Illiana

High Temp: 51 °F

Low Temp: 33 °F

Mean Temp: 42 °F

Precipitation: 2.81"

Humidity: 72%

Dew Point: 33 °F

Wind: 14 mph

Pressure: 30.11 "Hg

Visibility: 9 mi

December Climate & Weather Averages in Illiana

High Temp: 40 °F

Low Temp: 25 °F

Mean Temp: 32 °F

Precipitation: 2.46"

Humidity: 78%

Dew Point: 26 °F

Wind: 14 mph

Pressure: 30.10 "Hg

Visibility: 8 mi

Quick Climate Info

Hottest MonthJuly (74 °F avg)
Coldest MonthJanuary (27 °F avg)
Wettest MonthJune (4.73" avg)
Windiest MonthApril (16 mph avg)
Annual precip.38.05" (per year)

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