How extreme does Crest Hill's weather get?

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

Based on 29 years of daily weather observations (1997–present), from the Romeoville Wfo station 6 km away. Updated through May 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 Crest Hill has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

102°F Jul 24, 2005

That is about 17°F hotter than a normal July afternoon in Crest Hill (typical high near 85°F).

The three most extreme on record

1 102°F Jul 24, 2005

2 101°F Jul 6, 2012

3 101°F Jul 7, 2012

❄️ Coldest night

-24°F Jan 16, 2009

About 40°F colder than a normal January night in Crest Hill (typical low near 16°F).

The three most extreme on record

1 -24°F Jan 16, 2009

2 -24°F Jan 31, 2019

3 -23°F Jan 30, 2019

🌧️ Most rain in one day

4.90 in Jul 27, 2003

More rain in a single day than Crest Hill usually gets in the whole month of July (typical July total about 4.5 in).

The three most extreme on record

1 4.90 in Jul 27, 2003

2 4.64 in Jun 9, 2011

3 4.45 in Sep 27, 2019

⛄ Most snow in one day

13.8 in Jan 2, 1999

Close to a whole typical January's snow in one day (Crest Hill averages about 11 in across the month).

The three most extreme on record

1 13.8 in Jan 2, 1999

2 13.1 in Feb 1, 2015

3 11.9 in Feb 1, 2011

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.

normal range of daily temperatureshottest ever recordedcoldest ever recorded

Crest Hill's record heat sits well above even a hot day for the season — July's 102°F is about 17°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, Crest Hill's warmest days reach the mid-80s°F and its coldest nights drop to the mid-10s°F. But across the record it has gone as high as 102°F and as low as −24°F. A single day has delivered over 5 inches of rain or close to 14 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 Romeoville Wfo (NOAA GHCN station USC00117457), about 6 km from the city centre.

How we build these numbers →

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