Weather Averages Allerton, IL

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Weather Averages for
Allerton, IL


Latitude: 40°5'N, Longitude: 88°13'W, Elevation: 743.0 ft, Distance: 18.76 mi

  Unit Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average temperature
over 30 years
°F 51 23 28 39 51 62 71 75 72 66 54 42 29
Average high temperature
over 30 years
°F 61 31 36 48 62 73 82 85 82 77 65 50 36
Average low temperature
over 30 years
°F 41 16 20 31 41 51 60 64 62 55 43 33 21
Highest recorded temperature
over 109 years
°F 109 69 71 84 95 96 102 109 102 102 93 80 69
Lowest recorded temperature
over 109 years
°F -25 -25 -25 -5 15 26 34 41 37 24 12 -5 -20
Average number of days above 90°F
over 30 years
days 25 - - - - 0.9 5.7 8.9 6.5 2.9 0.1 - -
Average precipitation
over 30 years
in 39.7 1.8 2.0 3.3 3.9 4.0 4.1 4.5 4.0 3.4 2.7 3.1 3.0
Average number of days below 32°F
over 30 years
days 122 28 24 19 5.7 0.3 - - - 0.1 3.8 16 26
Average number of days below 0°F
over 30 years
days 7 3.2 2 0.1 - - - - - - - 0.1 1.6
Average snowfall
over 30 years
in 28.0 8.1 7.0 4.1 0.8 - - - - - 0.1 2.0 6.0
Most rain reported in a day
over 109 years
in 5.3 2.4 2.3 2.9 3.1 4.5 3.9 4.4 5.3 3.9 3.7 4.1 3.0
Most rain reported in a month
over 109 years
in 58.5 7.6 6.1 8.4 9.6 11.2 11.6 13.8 10.0 9.8 9.0 10.1 6.6
Least rain reported in a month
over 109 years
in 18.3 0.1 0.2 0.4 0.5 0.2 0.3 0.5 0.1 0.1 0.2 - 0.1
Heating degree days
over 30 years
days 5882 1276 1036 777 404 146 15 2 7 78 343 689 1109
Cooling degree days
over 30 years
days 1001 - - 1 11 74 220 312 245 121 17 - -
Most snow reported in a month
over 109 years
in 51.9 28.3 18.5 32.0 8.0 2.5 - - - - 3.3 11.2 19.1