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Grand Detour, Illinois Climate Averages

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Grand Detour Monthly Climate Averages

January
February
March
April
May
June
July
August
September
October
November
December
Hi 28°F Lo 14°F Hi 32°F Lo 17°F Hi 47°F Lo 31°F Hi 58°F Lo 40°F Hi 70°F Lo 52°F Hi 79°F Lo 61°F Hi 81°F Lo 64°F Hi 81°F Lo 62°F Hi 75°F Lo 56°F Hi 61°F Lo 45°F Hi 47°F Lo 32°F Hi 36°F Lo 24°F
10 mph 10 mph 10 mph 10 mph 9 mph 8 mph 7 mph 7 mph 8 mph 9 mph 10 mph 10 mph
2.2 in 2.3 in 3.7 in 5.4 in 6.5 in 6.1 in 4 in 3.7 in 3.6 in 4.3 in 2.6 in 2.6 in
86% 83% 76% 74% 77% 80% 84% 81% 76% 71% 74% 80%
62% 56% 52% 51% 45% 36% 35% 32% 32% 41% 42% 56%
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
18 17 21 20 20 20 24 24 23 23 24 21
8 7 7 9 11 10 7 7 7 7 6 8
5 5 3 1 0 0 0 0 0 0 1 3
1 0 1 0 0 0 0 0 1 0 0 1
1 2 2 3 5 5 6 5 4 2 1 1
104 122 146 141 170 207 221 231 230 187 180 131
January
February
March
April
May
June
July
August
September
October
November
December
Hi -2°C Lo -10°C Hi 0°C Lo -8°C Hi 8°C Lo -1°C Hi 14°C Lo 4°C Hi 21°C Lo 11°C Hi 26°C Lo 16°C Hi 27°C Lo 18°C Hi 27°C Lo 17°C Hi 24°C Lo 13°C Hi 16°C Lo 7°C Hi 8°C Lo 0°C Hi 2°C Lo -5°C
16 km/h 16 km/h 17 km/h 17 km/h 14 km/h 12 km/h 11 km/h 11 km/h 13 km/h 15 km/h 16 km/h 16 km/h
56 mm 58 mm 93 mm 137 mm 165 mm 154 mm 102 mm 94 mm 91 mm 108 mm 66 mm 67 mm
86% 83% 76% 74% 77% 80% 84% 81% 76% 71% 74% 80%
62% 56% 52% 51% 45% 36% 35% 32% 32% 41% 42% 56%
1020 mb 1020 mb 1018 mb 1014 mb 1015 mb 1013 mb 1015 mb 1015 mb 1017 mb 1016 mb 1019 mb 1019 mb
18 17 21 20 20 20 24 24 23 23 24 21
8 7 7 9 11 10 7 7 7 7 6 8
5 5 3 1 0 0 0 0 0 0 1 3
1 0 1 0 0 0 0 0 1 0 0 1
1 2 2 3 5 5 6 5 4 2 1 1
104 122 146 141 170 207 221 231 230 187 180 131
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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