What is the hottest month in Jerome, IL?

July is the warmest month, with a normal high of 86°F at Springfield #2.

What is the coldest month in Jerome, IL?

January is the coldest month, with a normal low of 19°F.

What is the wettest month in Jerome, IL?

May has the most precipitation on average, about 5.14 inches.

Checked Oct 25, 2026

Jerome, IL Climate

1991 to 2020 normals at Springfield #2, 2 mi from the center of Jerome, elevation 599 ft.

Average weather by month

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

Month	High	Low	Precip.	Snow
January	36°	19°	2.19 in	--
February	41°	22°	2.20 in	--
March	52°	31°	2.96 in	--
April	65°	41°	4.13 in	--
May	74°	53°	5.14 in	--
June	83°	63°	5.04 in	--
July	86°	66°	4.38 in	--
August	84°	64°	2.86 in	--
September	78°	56°	3.06 in	--
October	66°	44°	3.10 in	--
November	53°	33°	3.10 in	--
December	41°	24°	2.29 in	--
Year	63°		40.45 in	--

Frequently asked questions

What is the hottest month in Jerome, IL?: July is the warmest month, with a normal high of 86°F at Springfield #2.
What is the coldest month in Jerome, IL?: January is the coldest month, with a normal low of 19°F.
What is the wettest month in Jerome, IL?: May has the most precipitation on average, about 5.14 inches.

Today

Jerome, 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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Climate normals are 30-year averages measured at one weather station, which may be miles from the place named here or at a different elevation.

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