Climate-Zone.com

HomeCitiesUnited StatesIllinoisDarienTools › Weather extremes

Weather extremes

How extreme does Darien's weather get?

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

Based on 34 years of daily weather observations (1992–present), from the Little Red School House station 9 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 Darien has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
104°F Jul 8, 2020

That is about 14°F hotter than a normal July afternoon in Darien (typical high near 90°F).

The three most extreme on record

1 104°F Jul 8, 2020
2 103°F Jul 28, 2020
3 102°F May 28, 2018
❄️ Coldest night
-19°F Jan 30, 2019

About 34°F colder than a normal January night in Darien (typical low near 15°F).

The three most extreme on record

1 -19°F Jan 30, 2019
2 -18°F Jan 6, 2014
3 -17°F Jan 7, 2014
🌧️ Most rain in one day
10.00 in Jul 18, 1996

More rain in a single day than Darien usually gets in the whole month of July (typical July total about 4.1 in).

The three most extreme on record

1 10.00 in Jul 18, 1996
2 5.02 in Jun 8, 1993
3 4.60 in Jul 3, 2023
Most snow in one day
14.0 in Feb 2, 2011

The three most extreme on record

1 14.0 in Feb 2, 2011
2 10.5 in Jan 31, 2002
3 9.9 in Mar 6, 2013

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.

-30°-10°10°30°50°70°90°110°130° all-time high 104°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Darien's record heat sits well above even a hot day for the season — July's 104°F is about 14°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, Darien's warmest days reach the low 90s°F and its coldest nights drop to the mid-10s°F. But across the record it has gone as high as 104°F and as low as −19°F. A single day has delivered over 10 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 Aurora Water (NOAA GHCN station USC00110338), about 28 km from the city centre.

How we build these numbers →