What is the hottest month in Jackson County, IL?

July is the warmest month, with a normal high of 88°F at Carbondale Southern Il AP.

What is the coldest month in Jackson County, IL?

January is the coldest month, with a normal low of 25°F.

What is the wettest month in Jackson County, IL?

April has the most precipitation on average, about 5.34 inches.

Checked Oct 25, 2026

Jackson County, IL Climate

1991 to 2020 normals at Carbondale Southern Il AP, 8.9 mi from the center of Jackson County, elevation 406 ft.

Average weather by month

Select a month for daily normals and last year's weather

Month	High	Low	Precip.	Snow
January	42°	25°	2.79 in	--
February	47°	28°	2.61 in	--
March	57°	36°	4.14 in	--
April	68°	45°	5.34 in	--
May	77°	55°	4.98 in	--
June	86°	64°	4.11 in	--
July	88°	68°	3.61 in	--
August	87°	65°	3.05 in	--
September	81°	56°	2.85 in	--
October	70°	45°	3.54 in	--
November	56°	35°	3.87 in	--
December	46°	28°	3.12 in	--
Year	67°		44.01 in	--

Frequently asked questions

What is the hottest month in Jackson County, IL?: July is the warmest month, with a normal high of 88°F at Carbondale Southern Il AP.
What is the coldest month in Jackson County, IL?: January is the coldest month, with a normal low of 25°F.
What is the wettest month in Jackson County, IL?: April has the most precipitation on average, about 5.34 inches.

Today

Jackson County, IL forecast

Data sources

U.S. Climate Normals 1991-2020NOAA National Centers for Environmental Information
U.S. Climate Normals 1991-2020 (daily) and GHCN-Daily via Access Data ServiceNOAA National Centers for Environmental Information

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About this data

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