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Portland, Illinois Climate Averages

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Portland Monthly Climate Averages

January
February
March
April
May
June
July
August
September
October
November
December
Hi 27°F Lo 15°F Hi 30°F Lo 18°F Hi 46°F Lo 32°F Hi 57°F Lo 41°F Hi 70°F Lo 53°F Hi 79°F Lo 61°F Hi 81°F Lo 64°F Hi 80°F Lo 62°F Hi 76°F Lo 55°F Hi 61°F Lo 45°F Hi 47°F Lo 33°F Hi 35°F Lo 24°F
10 mph 10 mph 10 mph 11 mph 9 mph 8 mph 7 mph 7 mph 8 mph 10 mph 10 mph 10 mph
2.4 in 2.8 in 4.2 in 6.1 in 8.4 in 7.2 in 5.4 in 4.5 in 3.8 in 4.8 in 3.5 in 2.8 in
85% 83% 76% 74% 77% 81% 84% 81% 76% 71% 73% 79%
58% 56% 48% 49% 43% 31% 30% 28% 28% 39% 40% 52%
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
13 12 18 19 21 21 24 25 25 24 21 16
4 3 7 9 10 9 7 6 5 6 5 5
14 13 6 2 0 0 0 0 0 1 3 10
3 2 2 2 2 2 5 6 5 1 1 2
1 2 2 4 5 6 6 5 4 2 1 1
211 195 259 243 279 310 334 338 315 273 269 240
January
February
March
April
May
June
July
August
September
October
November
December
Hi -3°C Lo -10°C Hi -1°C Lo -8°C Hi 8°C Lo 0°C Hi 14°C Lo 5°C Hi 21°C Lo 12°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 1°C Hi 2°C Lo -4°C
16 km/h 17 km/h 17 km/h 17 km/h 15 km/h 13 km/h 11 km/h 11 km/h 13 km/h 15 km/h 16 km/h 16 km/h
62 mm 72 mm 106 mm 156 mm 212 mm 183 mm 137 mm 115 mm 97 mm 122 mm 89 mm 71 mm
85% 83% 76% 74% 77% 81% 84% 81% 76% 71% 73% 79%
58% 56% 48% 49% 43% 31% 30% 28% 28% 39% 40% 52%
1020 mb 1020 mb 1018 mb 1014 mb 1014 mb 1013 mb 1015 mb 1015 mb 1017 mb 1016 mb 1019 mb 1019 mb
13 12 18 19 21 21 24 25 25 24 21 16
4 3 7 9 10 9 7 6 5 6 5 5
14 13 6 2 0 0 0 0 0 1 3 10
3 2 2 2 2 2 5 6 5 1 1 2
1 2 2 4 5 6 6 5 4 2 1 1
211 195 259 243 279 310 334 338 315 273 269 240
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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