How extreme does Denison's weather get?

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

Based on 50+ years of daily weather observations (1971–present), from the Sherman station 11 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 Denison has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

110°F Jun 28, 1980

That is about 22°F hotter than a normal June afternoon in Denison (typical high near 88°F).

The three most extreme on record

1 110°F Jun 28, 1980

2 109°F Jun 27, 1980

3 109°F Jul 30, 1986

❄️ Coldest night

-3°F Feb 16, 2021

About 40°F colder than a normal February night in Denison (typical low near 37°F).

The three most extreme on record

1 -3°F Feb 16, 2021recent

2 -2°F Dec 23, 1989

3 0°F Dec 8, 2003

🌧️ Most rain in one day

10.00 in Aug 9, 1982

More rain in a single day than Denison usually gets in the whole month of August (typical August total about 2.9 in).

The three most extreme on record

1 10.00 in Aug 9, 1982

2 8.00 in May 13, 1982

3 7.93 in Nov 14, 1994

⛄ Most snow in one day

6.0 in Feb 7, 1979

The three most extreme on record

1 6.0 in Feb 7, 1979

2 5.7 in Feb 5, 2002

3 5.5 in Feb 18, 1978

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

Denison's record heat sits well above even a hot day for the season — June's 110°F is about 22°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, Denison's warmest days reach the low 90s°F and its coldest nights drop to the mid-30s°F. But across the record it has gone as high as 110°F and as low as −3°F. A single day has delivered over 10 inches of rain or close to 6 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 Sherman (NOAA GHCN station USC00418274), about 11 km from the city centre.

How we build these numbers →

← Denison city detail