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Carbondale, Illinois climate
Cfa Humid subtropical
Carbondale has a strongly seasonal mild-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 −5°C at night. Precipitation is fairly even year-round, totalling about 1243 mm. Light snow accumulates each winter (29 cm of snow per year on average).
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation split into rain and snow · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsCarbondale climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 5 | 8 | 13 | 20 | 25 | 29 | 31 | 31 | 27 | 21 | 13 | 7 |
| Avg temp (°C) | 0 | 2 | 7 | 13 | 19 | 24 | 26 | 24 | 20 | 14 | 8 | 2 |
| Avg low (°C) | −5 | −3 | 1 | 7 | 13 | 18 | 20 | 18 | 13 | 7 | 2 | −3 |
| Precipitation (mm) | 85 | 79 | 115 | 141 | 132 | 117 | 105 | 80 | 87 | 94 | 114 | 94 |
| Snowfall (cm) | 8 | 10 | 3 | — | — | — | — | — | — | 1 | — | 7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 5 | 8 | 13 | 20 | 25 | 29 |
| Avg temp (°C) | 0 | 2 | 7 | 13 | 19 | 24 |
| Avg low (°C) | −5 | −3 | 1 | 7 | 13 | 18 |
| Precipitation (mm) | 85 | 79 | 115 | 141 | 132 | 117 |
| Snowfall (cm) | 8 | 10 | 3 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 31 | 27 | 21 | 13 | 7 |
| Avg temp (°C) | 26 | 24 | 20 | 14 | 8 | 2 |
| Avg low (°C) | 20 | 18 | 13 | 7 | 2 | −3 |
| Precipitation (mm) | 105 | 80 | 87 | 94 | 114 | 94 |
| Snowfall (cm) | — | — | — | 1 | — | 7 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 12 | 11 | 12 | 10 | 9 | 8 | 8 | 9 | 10 | 11 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.8 | 7 | 13 | 11 | 5 | 0.3 | — | — |
| Days with low ≤ 0°C (days) | 25 | 21 | 14 | 3 | — | — | — | — | 0.1 | 4 | 14 | 22 |
| Days with snowfall ≥ 2.5 cm (days) | 0.9 | 1 | 0.4 | — | — | — | — | — | — | 0.1 | 0.1 | 0.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 12 | 11 | 12 | 10 |
| Days with high ≥ 32°C (days) | — | — | — | — | 0.8 | 7 |
| Days with low ≤ 0°C (days) | 25 | 21 | 14 | 3 | — | — |
| Days with snowfall ≥ 2.5 cm (days) | 0.9 | 1 | 0.4 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 8 | 8 | 9 | 10 | 11 |
| Days with high ≥ 32°C (days) | 13 | 11 | 5 | 0.3 | — | — |
| Days with low ≤ 0°C (days) | — | — | 0.1 | 4 | 14 | 22 |
| Days with snowfall ≥ 2.5 cm (days) | — | — | — | 0.1 | 0.1 | 0.9 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 64 | 67 | 64 | 61 | 63 | 54 | 50 | 48 | 46 | 50 | 57 | 64 |
| Clear days (≤ 30% cloud) | 6 | 4 | 6 | 7 | 6 | 8 | 10 | 11 | 12 | 11 | 8 | 5 |
| Partly cloudy days (30–70%) | 9 | 9 | 9 | 9 | 10 | 11 | 12 | 12 | 9 | 9 | 9 | 10 |
| Cloudy days (≥ 70%) | 16 | 15 | 16 | 14 | 15 | 11 | 10 | 9 | 9 | 11 | 13 | 16 |
| Relative humidity (%) | 84 | 82 | 80 | 78 | 80 | 78 | 76 | 70 | 68 | 70 | 77 | 83 |
| Wind speed (m/s) | 2.3 | 2.3 | 2.2 | 2.1 | 1.6 | 1.3 | 1.2 | 1.2 | 1.4 | 1.6 | 1.8 | 1.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 64 | 67 | 64 | 61 | 63 | 54 |
| Clear days (≤ 30% cloud) | 6 | 4 | 6 | 7 | 6 | 8 |
| Partly cloudy days (30–70%) | 9 | 9 | 9 | 9 | 10 | 11 |
| Cloudy days (≥ 70%) | 16 | 15 | 16 | 14 | 15 | 11 |
| Relative humidity (%) | 84 | 82 | 80 | 78 | 80 | 78 |
| Wind speed (m/s) | 2.3 | 2.3 | 2.2 | 2.1 | 1.6 | 1.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 50 | 48 | 46 | 50 | 57 | 64 |
| Clear days (≤ 30% cloud) | 10 | 11 | 12 | 11 | 8 | 5 |
| Partly cloudy days (30–70%) | 12 | 12 | 9 | 9 | 9 | 10 |
| Cloudy days (≥ 70%) | 10 | 9 | 9 | 11 | 13 | 16 |
| Relative humidity (%) | 76 | 70 | 68 | 70 | 77 | 83 |
| Wind speed (m/s) | 1.2 | 1.2 | 1.4 | 1.6 | 1.8 | 1.9 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Carbondale Sewage Plt (NOAA GHCN station USC00111265), about 5 km from the city centre.
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.