Climate-Zone.com

HomeCitiesUnited StatesIllinoisCarbondaleTools › Weather extremes

Weather extremes

How extreme does Carbondale's weather get?

The hottest, coldest, wettest and snowiest days Carbondale has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 50+ years of daily weather observations (1971–present), from the Carbondale Sewage Plt station 5 km away. Updated through June 2026 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Carbondale has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
108°F Jun 30, 2012

That is about 23°F hotter than a normal June afternoon in Carbondale (typical high near 85°F).

The three most extreme on record

1 108°F Jun 30, 2012
2 108°F Jul 7, 2012
3 107°F Jul 6, 2012
❄️ Coldest night
-25°F Jan 11, 1977

About 48°F colder than a normal January night in Carbondale (typical low near 23°F).

The three most extreme on record

1 -25°F Jan 11, 1977
2 -24°F Jan 12, 1977
3 -24°F Jan 17, 1977
🌧️ Most rain in one day
6.90 in Jun 17, 2000

More rain in a single day than Carbondale usually gets in the whole month of June (typical June total about 4.6 in).

The three most extreme on record

1 6.90 in Jun 17, 2000
2 6.10 in Mar 19, 2008
3 5.67 in Mar 28, 1977
Most snow in one day
10.0 in Feb 26, 1979

Close to a whole typical February's snow in one day (Carbondale averages about 4 in across the month).

The three most extreme on record

1 10.0 in Feb 26, 1979
2 9.5 in Feb 16, 1993
3 8.5 in Jan 17, 1978

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

-50°-30°-10°10°30°50°70°90°110°130° all-time high 108°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Carbondale's record heat sits well above even a hot day for the season — June's 108°F is about 23°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Carbondale's warmest days reach the high 80s°F and its coldest nights drop to the low 20s°F. But across the record it has gone as high as 108°F and as low as −25°F. A single day has delivered over 7 inches of rain or close to 10 inches of snow. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.
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.

How we build these numbers →