SIU School of Medicine

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Division of Medicine Psychiatry

Local Weather

Weather can't be forecast more than a week or so in advance, but weather averages are good indicators of what to expect any month.

All temperatures are in degrees Fahrenheit. Precipitation is in inches.

Month

Average High

Average Low

Warmest Ever

Coldest Ever

Average Dew Point

Precipitation

January

35

19

73

-21

18

1.8

February

38

22

78

-24

22

1.7

March

50

32

91

-12

31

3.1

April

63

43

90

17

41

3.6

May

74

53

101

28

51

3.8

June

84

63

104

40

61

3.9

July

88

67

112

48

65

3.3

August

85

65

108

43

64

3.1

September

79

57

101

32

56

3.3

October

67

46

93

13

44

2.6

November

51

34

83

-3

33

2.4

December

38

24

74

-21

24

2.1