Weather Averages Alton, IL

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Weather Averages for
Alton, IL



Latitude: 38°52'N, Longitude: 90°10'W, Elevation: 131.1 m, Distance: 3.44 km

  Unit Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average temperature
over 30 years		 °C 12 -2 0 5 12 18 23 25 24 20 13 6 0
Average high temperature
over 30 years		 °C 17 2 4 11 18 23 29 31 30 26 19 12 4
Average low temperature
over 30 years		 °C 6 -7 -5 0 7 12 17 20 18 14 7 1 -4
Highest recorded temperature
over 49 years		 °C 43 22 23 29 33 36 41 43 41 39 33 28 22
Lowest recorded temperature
over 49 years		 °C -26 -26 -26 -18 -6 0 7 10 7 2 -3 -15 -26
Average number of days above 27°C
over 30 years		 days 37 - - - 0.1 1.1 7.3 14 10 3.4 0.2 - -
Average precipitation
over 30 years		 cm 97.5 4.8 5.3 9.1 9.4 10.9 8.4 9.4 8.4 7.9 7.1 8.6 8.1
Average number of days below -1.5°C
over 30 years		 days 103 27 22 16 2.2 - - - - - 1.3 12 23
Average number of days below -17.5°C
over 30 years		 days 3.4 1.8 0.8 - - - - - - - - - 0.7
Average snowfall
over 30 years		 cm 30.2 11.2 10.9 7.4 1.0 - - - - - - 1.3 3.8
Most rain reported in a day
over 54 years		 cm 19.6 9.1 5.8 10.4 19.6 11.9 8.6 11.9 10.9 8.9 8.9 13.7 6.9
Most rain reported in a month
over 54 years		 cm 136.4 19.8 14.5 20.6 44.5 25.9 27.4 24.4 37.6 29.2 18.0 32.5 20.8
Least rain reported in a month
over 54 years		 cm 48.5 0.3 - 2.3 2.0 2.5 1.0 0.8 1.3 0.8 0.8 0.5 0.5
Heating degree days
over 30 years		 days 5189 1174 957 691 323 101 6 1 2 48 277 604 1005
Cooling degree days
over 30 years		 days 1343 - - 2 19 96 279 415 344 163 25 - -
Most snow reported in a month
over 54 years		 cm 115.8 47.8 49.5 62.5 14.0 - - - - - - 24.9 22.1

Check weather averages for nearby locations (some locations might offer more data):
Latitude: 39°5'N, Longitude: 90°20'W, Elevation: 192.0 m, Distance: 9.33 km
Latitude: 38°45'N, Longitude: 90°22'W, Elevation: 163.1 m, Distance: 11.50 km
Latitude: 38°37'N, Longitude: 90°12'W, Elevation: 142.0 m, Distance: 14.09 km
Latitude: 38°46'N, Longitude: 90°30'W, Elevation: 142.3 m, Distance: 14.61 km
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