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Danville, Illinois climate
Cfa Humid subtropical
Danville has a strongly seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 86°F, while the coldest is January averaging around 19°F at night. Around 43 inches of precipitation falls each year, peaking in June (5.2 inches) and easing off in February (2.2 inches).
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)Danville climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 36 | 41 | 52 | 65 | 75 | 84 | 86 | 85 | 80 | 67 | 53 | 41 |
| Avg temp (°F) | 28 | 32 | 42 | 53 | 63 | 72 | 75 | 73 | 67 | 56 | 43 | 33 |
| Avg low (°F) | 19 | 22 | 31 | 41 | 51 | 61 | 64 | 62 | 55 | 44 | 33 | 25 |
| Precipitation (in) | 2.3 | 2.2 | 2.9 | 4.1 | 4.7 | 5.2 | 4.7 | 3.6 | 3.1 | 3.8 | 3.3 | 2.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 36 | 41 | 52 | 65 | 75 | 84 |
| Avg temp (°F) | 28 | 32 | 42 | 53 | 63 | 72 |
| Avg low (°F) | 19 | 22 | 31 | 41 | 51 | 61 |
| Precipitation (in) | 2.3 | 2.2 | 2.9 | 4.1 | 4.7 | 5.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 86 | 85 | 80 | 67 | 53 | 41 |
| Avg temp (°F) | 75 | 73 | 67 | 56 | 43 | 33 |
| Avg low (°F) | 64 | 62 | 55 | 44 | 33 | 25 |
| Precipitation (in) | 4.7 | 3.6 | 3.1 | 3.8 | 3.3 | 2.7 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 72 | 72 | 68 | 66 | 66 | 59 | 52 | 50 | 48 | 58 | 66 | 71 |
| Relative humidity (%) | 86 | 84 | 80 | 76 | 77 | 78 | 77 | 75 | 71 | 73 | 79 | 85 |
| Wind speed (mph) | 8.8 | 8.5 | 8.6 | 8.7 | 7.2 | 5.7 | 4.9 | 4.7 | 5.4 | 6.9 | 7.9 | 8.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 72 | 72 | 68 | 66 | 66 | 59 |
| Relative humidity (%) | 86 | 84 | 80 | 76 | 77 | 78 |
| Wind speed (mph) | 8.8 | 8.5 | 8.6 | 8.7 | 7.2 | 5.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 52 | 50 | 48 | 58 | 66 | 71 |
| Relative humidity (%) | 77 | 75 | 71 | 73 | 79 | 85 |
| Wind speed (mph) | 4.9 | 4.7 | 5.4 | 6.9 | 7.9 | 8.1 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Purdue University Airport, a weather station, about 66 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.