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Bloomington, Illinois climate
Dfa Hot-summer humid continental
Bloomington has a strongly seasonal cool-temperate climate (Hot-summer humid continental, Köppen Dfa). The hottest month is July with an average daily high near 31°C, while the coldest is January averaging around −8°C at night. Around 987 mm of precipitation falls each year, peaking in May (121 mm) and easing off in February (52 mm).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Bloomington climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 2 | 5 | 12 | 19 | 24 | 29 | 31 | 30 | 27 | 20 | 12 | 5 |
| Avg temp (°C) | −3 | −1 | 5 | 12 | 18 | 23 | 25 | 24 | 20 | 13 | 6 | 0 |
| Avg low (°C) | −8 | −7 | −1 | 5 | 11 | 16 | 18 | 17 | 13 | 6 | 0 | −5 |
| Precipitation (mm) | 56 | 52 | 70 | 101 | 121 | 104 | 95 | 89 | 92 | 81 | 70 | 56 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 2 | 5 | 12 | 19 | 24 | 29 |
| Avg temp (°C) | −3 | −1 | 5 | 12 | 18 | 23 |
| Avg low (°C) | −8 | −7 | −1 | 5 | 11 | 16 |
| Precipitation (mm) | 56 | 52 | 70 | 101 | 121 | 104 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 30 | 27 | 20 | 12 | 5 |
| Avg temp (°C) | 25 | 24 | 20 | 13 | 6 | 0 |
| Avg low (°C) | 18 | 17 | 13 | 6 | 0 | −5 |
| Precipitation (mm) | 95 | 89 | 92 | 81 | 70 | 56 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 67 | 68 | 66 | 65 | 65 | 57 | 50 | 49 | 47 | 57 | 64 | 67 |
| Relative humidity (%) | 86 | 82 | 78 | 75 | 76 | 77 | 75 | 72 | 70 | 72 | 78 | 84 |
| Wind speed (mph) | 8.4 | 8.4 | 8.7 | 8.8 | 7.2 | 5.9 | 5.0 | 4.9 | 5.7 | 7.0 | 7.9 | 7.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 67 | 68 | 66 | 65 | 65 | 57 |
| Relative humidity (%) | 86 | 82 | 78 | 75 | 76 | 77 |
| Wind speed (mph) | 8.4 | 8.4 | 8.7 | 8.8 | 7.2 | 5.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 50 | 49 | 47 | 57 | 64 | 67 |
| Relative humidity (%) | 75 | 72 | 70 | 72 | 78 | 84 |
| Wind speed (mph) | 5.0 | 4.9 | 5.7 | 7.0 | 7.9 | 7.8 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Greater Peoria Regional Airport, a weather station, about 62 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.