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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 88°F, while the coldest is January averaging around 23°F at night. Precipitation is fairly even year-round, totalling about 49 inches. Light snow accumulates each winter (11 inches 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 (°F) | 41 | 46 | 56 | 68 | 77 | 85 | 88 | 87 | 81 | 70 | 56 | 45 |
| Avg temp (°F) | 32 | 36 | 45 | 56 | 66 | 74 | 78 | 76 | 69 | 57 | 46 | 36 |
| Avg low (°F) | 23 | 26 | 35 | 44 | 55 | 64 | 68 | 65 | 56 | 44 | 35 | 27 |
| Precipitation (in) | 3.4 | 3.1 | 4.5 | 5.6 | 5.2 | 4.6 | 4.1 | 3.2 | 3.4 | 3.7 | 4.5 | 3.7 |
| Snowfall (in) | 3.2 | 4.0 | 1.3 | — | — | — | — | — | — | 0.2 | — | 2.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 41 | 46 | 56 | 68 | 77 | 85 |
| Avg temp (°F) | 32 | 36 | 45 | 56 | 66 | 74 |
| Avg low (°F) | 23 | 26 | 35 | 44 | 55 | 64 |
| Precipitation (in) | 3.4 | 3.1 | 4.5 | 5.6 | 5.2 | 4.6 |
| Snowfall (in) | 3.2 | 4.0 | 1.3 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 88 | 87 | 81 | 70 | 56 | 45 |
| Avg temp (°F) | 78 | 76 | 69 | 57 | 46 | 36 |
| Avg low (°F) | 68 | 65 | 56 | 44 | 35 | 27 |
| Precipitation (in) | 4.1 | 3.2 | 3.4 | 3.7 | 4.5 | 3.7 |
| Snowfall (in) | — | — | — | 0.2 | — | 2.7 |
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 ≥ 90°F (days) | — | — | — | — | 0.8 | 7 | 13 | 11 | 5 | 0.3 | — | — |
| Days with low ≤ 32°F (days) | 25 | 21 | 14 | 3 | — | — | — | — | 0.1 | 4 | 14 | 22 |
| Days with snowfall ≥ 1 in (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 ≥ 90°F (days) | — | — | — | — | 0.8 | 7 |
| Days with low ≤ 32°F (days) | 25 | 21 | 14 | 3 | — | — |
| Days with snowfall ≥ 1 in (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 ≥ 90°F (days) | 13 | 11 | 5 | 0.3 | — | — |
| Days with low ≤ 32°F (days) | — | — | 0.1 | 4 | 14 | 22 |
| Days with snowfall ≥ 1 in (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 (mph) | 5.1 | 5.2 | 5.0 | 4.6 | 3.6 | 3.0 | 2.7 | 2.7 | 3.0 | 3.5 | 3.9 | 4.3 |
| 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 (mph) | 5.1 | 5.2 | 5.0 | 4.6 | 3.6 | 3.0 |
| 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 (mph) | 2.7 | 2.7 | 3.0 | 3.5 | 3.9 | 4.3 |
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.