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Grafton, Illinois Climate Averages

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Grafton Monthly Climate Averages

January
February
March
April
May
June
July
August
September
October
November
December
Hi 38°F Lo 24°F Hi 43°F Lo 27°F Hi 55°F Lo 38°F Hi 65°F Lo 46°F Hi 75°F Lo 57°F Hi 84°F Lo 66°F Hi 87°F Lo 69°F Hi 86°F Lo 68°F Hi 81°F Lo 61°F Hi 67°F Lo 49°F Hi 54°F Lo 38°F Hi 44°F Lo 31°F
9 mph 9 mph 9 mph 9 mph 8 mph 7 mph 6 mph 6 mph 7 mph 8 mph 9 mph 9 mph
2.5 in 2.8 in 4.3 in 5.6 in 6 in 4.8 in 4.1 in 4.8 in 3.4 in 4.1 in 3.1 in 2.9 in
76% 75% 74% 74% 78% 76% 77% 75% 70% 68% 69% 74%
52% 48% 47% 43% 39% 29% 30% 29% 28% 34% 36% 47%
30.1 in 30.1 in 30.1 in 29.9 in 30.0 in 29.9 in 30.0 in 30.0 in 30.0 in 30.0 in 30.1 in 30.1 in
21 19 23 21 20 21 23 23 24 24 24 23
6 6 7 9 11 9 8 8 6 7 5 6
3 3 1 0 0 0 0 0 0 0 1 1
0 0 0 0 0 0 0 0 1 0 0 0
2 2 3 4 5 6 6 6 5 3 2 1
153 152 159 169 198 237 241 246 244 224 214 171
January
February
March
April
May
June
July
August
September
October
November
December
Hi 3°C Lo -4°C Hi 6°C Lo -3°C Hi 13°C Lo 3°C Hi 18°C Lo 8°C Hi 24°C Lo 14°C Hi 29°C Lo 19°C Hi 31°C Lo 21°C Hi 30°C Lo 20°C Hi 27°C Lo 16°C Hi 20°C Lo 10°C Hi 12°C Lo 3°C Hi 7°C Lo -1°C
15 km/h 15 km/h 15 km/h 15 km/h 12 km/h 11 km/h 9 km/h 10 km/h 10 km/h 13 km/h 14 km/h 14 km/h
63 mm 71 mm 110 mm 141 mm 152 mm 121 mm 104 mm 122 mm 86 mm 104 mm 78 mm 73 mm
76% 75% 74% 74% 78% 76% 77% 75% 70% 68% 69% 74%
52% 48% 47% 43% 39% 29% 30% 29% 28% 34% 36% 47%
1021 mb 1020 mb 1018 mb 1014 mb 1015 mb 1013 mb 1015 mb 1015 mb 1017 mb 1017 mb 1020 mb 1020 mb
21 19 23 21 20 21 23 23 24 24 24 23
6 6 7 9 11 9 8 8 6 7 5 6
3 3 1 0 0 0 0 0 0 0 1 1
0 0 0 0 0 0 0 0 1 0 0 0
2 2 3 4 5 6 6 6 5 3 2 1
153 152 159 169 198 237 241 246 244 224 214 171
Month
Avg. Temperatures
Avg. Wind Speed
Avg. Precipitation
Average Humidity
Avg. Cloud Cover
Pressure Average
Average Dry Days
Avg. Precip. Days
Avg. Snow Days
Average Fog Days
Average UV Index
Avg. Hours of Sun
Averages are based on historical weather data from the past 10 years.

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