How extreme does Arlington Heights's weather get?

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

Based on 30 years of daily weather observations (1996–present), from the Chicago Palwaukee Ap station 7 km away. Updated through June 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 Arlington Heights has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

108°F Nov 26, 1999

That is about 60°F hotter than a normal November afternoon in Arlington Heights (typical high near 49°F).

The three most extreme on record

1 108°F Nov 26, 1999

2 104°F Jul 6, 2012

3 103°F Jul 4, 2012

❄️ Coldest night

-21°F Jan 30, 2019

About 39°F colder than a normal January night in Arlington Heights (typical low near 18°F).

The three most extreme on record

1 -21°F Jan 30, 2019

2 -20°F Jan 31, 2019

3 -16°F Jan 5, 1999

🌧️ Most rain in one day

4.53 in Jun 26, 2013

More rain in a single day than Arlington Heights usually gets in the whole month of June (typical June total about 4.0 in).

The three most extreme on record

1 4.53 in Jun 26, 2013

2 4.36 in Sep 13, 2008

3 3.72 in Jun 9, 2018

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

Arlington Heights's record heat sits well above even a hot day for the season — November's 108°F is about 60°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, Arlington Heights's warmest days reach the mid-80s°F and its coldest nights drop to the high 10s°F. But across the record it has gone as high as 108°F and as low as −21°F. A single day has delivered over 5 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 Chicago Palwaukee AP (NOAA GHCN station USW00004838), about 7 km from the city centre.

How we build these numbers →

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