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What is the weather like in Alton, IllinoisAlton, Illinois monthly and yearly climate averages.

Alton, Illinois Climate Averages

Monthly and yearly weather averages for Alton, IllinoisWeather almanac for Alton, IL. Alton monthly weather averages.
Lat: 38.90N, Lon: 90.15W  Web Search
Alton Weather Warning NWS WEATHER ALERT FOR THE ALTON, IL AREA - Issued: 317 AM CDT Sun Aug 1 2021 Alton Weather Warning  

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There are currently no special weather statements for Alton, Illinois.

Alton Monthly Averages

12 Month Weather Scroll   °F Click to change Alton weather to Imperial units.Click to change Alton weather to Metric units. °C
January
February
March
April
May
June
July
August
September
October
November
December
Hi 37°F Lo 25°F Hi 41°F Lo 27°F Hi 54°F Lo 38°F Hi 64°F Lo 47°F Hi 74°F Lo 57°F Hi 83°F Lo 66°F Hi 85°F Lo 68°F Hi 84°F Lo 66°F Hi 79°F Lo 60°F Hi 66°F Lo 49°F Hi 53°F Lo 38°F Hi 42°F Lo 31°F
10 mph 10 mph 9 mph 9 mph 8 mph 7 mph 6 mph 6 mph 6 mph 8 mph 9 mph 9 mph
3.8 in 3.8 in 5.7 in 7.8 in 8.2 in 8.5 in 7 in 6.8 in 5.3 in 5.7 in 4.8 in 4 in
76% 77% 76% 76% 79% 77% 79% 78% 74% 70% 72% 75%
51% 50% 46% 41% 36% 26% 26% 25% 27% 32% 36% 47%
30.6 in 30.6 in 30.6 in 30.4 in 30.4 in 30.4 in 30.4 in 30.4 in 30.5 in 30.5 in 30.6 in 30.6 in
14 11 11 10 9 8 9 12 13 15 16 16
10 11 17 17 20 19 19 16 14 13 12 10
9 9 3 1 0 0 0 0 0 0 2 6
2 1 2 2 3 2 2 4 3 2 0 2
2 2 3 4 5 6 6 6 5 3 2 2
234 220 266 269 307 329 342 341 322 302 278 252
January
February
March
April
May
June
July
August
September
October
November
December
Hi 3°C Lo -4°C Hi 5°C Lo -3°C Hi 12°C Lo 4°C Hi 18°C Lo 8°C Hi 23°C Lo 14°C Hi 29°C Lo 19°C Hi 30°C Lo 20°C Hi 29°C Lo 19°C Hi 26°C Lo 16°C Hi 19°C Lo 10°C Hi 12°C Lo 4°C Hi 6°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 9 km/h 10 km/h 13 km/h 14 km/h 14 km/h
96 mm 96 mm 145 mm 198 mm 209 mm 217 mm 178 mm 173 mm 133 mm 146 mm 122 mm 102 mm
76% 77% 76% 76% 79% 77% 79% 78% 74% 70% 72% 75%
51% 50% 46% 41% 36% 26% 26% 25% 27% 32% 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
14 11 11 10 9 8 9 12 13 15 16 16
10 11 17 17 20 19 19 16 14 13 12 10
9 9 3 1 0 0 0 0 0 0 2 6
2 1 2 2 3 2 2 4 3 2 0 2
2 2 3 4 5 6 6 6 5 3 2 2
234 220 266 269 307 329 342 341 322 302 278 252
Month
Avg. Temperatures
Avg. Wind Speed
Avg. Precipitation
Average Humidity
Avg. Cloud Cover
Barometric Pressure
Average Dry Days
Avg. Precip. Days
Average 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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