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Astoria, Illinois climate
Cfa Humid subtropical
Astoria has a strongly seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 31°C, while the coldest is January averaging around −7°C at night. Around 981 mm of precipitation falls each year, peaking in June (125 mm) and easing off in February (47 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)Astoria climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 3 | 6 | 12 | 19 | 25 | 29 | 31 | 30 | 27 | 20 | 12 | 5 |
| Avg temp (°C) | −2 | 1 | 6 | 13 | 19 | 23 | 25 | 24 | 20 | 14 | 7 | 1 |
| Avg low (°C) | −7 | −5 | 1 | 6 | 12 | 17 | 19 | 18 | 13 | 7 | 1 | −4 |
| Precipitation (mm) | 52 | 47 | 70 | 100 | 113 | 125 | 99 | 83 | 80 | 82 | 73 | 57 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 3 | 6 | 12 | 19 | 25 | 29 |
| Avg temp (°C) | −2 | 1 | 6 | 13 | 19 | 23 |
| Avg low (°C) | −7 | −5 | 1 | 6 | 12 | 17 |
| Precipitation (mm) | 52 | 47 | 70 | 100 | 113 | 125 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 30 | 27 | 20 | 12 | 5 |
| Avg temp (°C) | 25 | 24 | 20 | 14 | 7 | 1 |
| Avg low (°C) | 19 | 18 | 13 | 7 | 1 | −4 |
| Precipitation (mm) | 99 | 83 | 80 | 82 | 73 | 57 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 67 | 69 | 66 | 63 | 64 | 56 | 49 | 47 | 46 | 55 | 62 | 67 |
| Relative humidity (%) | 85 | 82 | 78 | 75 | 77 | 77 | 75 | 72 | 69 | 71 | 77 | 84 |
| Wind speed (km/h) | 13.4 | 13.4 | 13.7 | 13.9 | 11.2 | 9.1 | 7.7 | 7.6 | 8.8 | 11.1 | 12.5 | 12.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 67 | 69 | 66 | 63 | 64 | 56 |
| Relative humidity (%) | 85 | 82 | 78 | 75 | 77 | 77 |
| Wind speed (km/h) | 13.4 | 13.4 | 13.7 | 13.9 | 11.2 | 9.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 49 | 47 | 46 | 55 | 62 | 67 |
| Relative humidity (%) | 75 | 72 | 69 | 71 | 77 | 84 |
| Wind speed (km/h) | 7.7 | 7.6 | 8.8 | 11.1 | 12.5 | 12.4 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Abraham Lincoln Capital Airport, a weather station, about 72 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.