How extreme does West Chicago's weather get?

The hottest, coldest, wettest and snowiest days West Chicago 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 Chicago W Chicago Dupage Ap station 4 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 West Chicago has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

100°F Jul 24, 2005

That is about 16°F hotter than a normal July afternoon in West Chicago (typical high near 84°F).

The three most extreme on record

1 100°F Jul 24, 2005

2 100°F Jul 6, 2012

3 100°F Jul 7, 2012

❄️ Coldest night

-29°F Jan 31, 2019

About 45°F colder than a normal January night in West Chicago (typical low near 16°F).

The three most extreme on record

1 -29°F Jan 31, 2019

2 -24°F Jan 5, 1999

3 -24°F Jan 30, 2019

🌧️ Most rain in one day

6.02 in Sep 13, 2008

More rain in a single day than West Chicago usually gets in the whole month of September (typical September total about 3.0 in).

The three most extreme on record

1 6.02 in Sep 13, 2008

2 3.90 in Oct 14, 2017

3 3.69 in May 14, 2020

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

West Chicago's record heat sits well above even a hot day for the season — July's 100°F is about 16°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, West Chicago'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 100°F and as low as −29°F. A single day has delivered over 6 inches of rain. 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 Aurora Water (NOAA GHCN station USC00110338), about 15 km from the city centre.

How we build these numbers →

← West Chicago city detail