Denison, TX climate
Denison has mild winters and hot summers. A typical July afternoon reaches 94°, a January night drops to 33°, and about 2 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Denison feels like
Winter
Spring
Summer
Fall
Denison weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 53° | 33° | 2.3" | 0.7" | 6 | 0 | 39° – 52° |
| February | 58° | 37° | 2.6" | 0.4" | 6 | 0 | 39° – 55° |
| March | 66° | 45° | 3.6" | 0.5" | 7 | 0 | 50° – 63° |
| April | 74° | 52° | 3.7" | 0 | 7 | 0 | 58° – 68° |
| May | 81° | 61° | 5.5" | 0 | 9 | 0 | 68° – 76° |
| June | 89° | 69° | 4.2" | 0 | 6 | 0 | 76° – 84° |
| July | 94° | 73° | 2.8" | 0 | 5 | 0 | 79° – 90° |
| August | 94° | 72° | 2.7" | 0 | 4 | 0 | 77° – 91° |
| September | 87° | 65° | 3.6" | 0 | 6 | 0 | 72° – 82° |
| October | 76° | 54° | 4.2" | 0 | 6 | 0 | 59° – 70° |
| November | 64° | 44° | 3.0" | 0 | 5 | 0 | 47° – 60° |
| December | 55° | 35° | 3.3" | 0.4" | 5 | 0 | 36° – 50° |
| Year | 74° | 53° | 41.6" | 2.0" | 73 | 1 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Denison
Denison gets 42 inches of rain and melted snow a year. May is the wettest month and January the driest. Rain or snow falls on about 73 days a year.
About 250 frost-free days a year
In half of years the last 32° night comes by March 14 and the first one by November 19. That leaves about 250 frost-free days for gardens, longer than 90% of U.S. towns.
Heating and cooling a home in Denison
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Denison, 55% of that work is heating and 45% is cooling.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Denison and its neighbors
Denison borders 1 town with climate data. January nights across them vary by 0.3°. Sherman has both the coldest January nights (34°) and the hottest July afternoons (94°). Denison’s January low is 33° and its July high 94°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Denison compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Denison averaged 0.5° warmer than the 1900s. The biggest change is in January (+1.8°). The shift is smaller than in 97% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Denison’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 39° to 55°. June is the most reliable, staying within 8°.
Common questions about Denison’s climate
What is the coldest month in Denison?
January, with a typical high of 53° and a low of 33°.
What is the hottest month in Denison?
August, with a typical high of 94° and a low of 72°. About 73 days a year reach 90°.
How much snow does Denison get?
About 2 inches in a normal winter, most of it in January.
When is the first frost in Denison?
In half of years the first 32° night comes by November 19, and the last spring frost by March 14.
What is the rainiest month in Denison?
May, with 5.5 inches of rain and melted snow. The year totals 42 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Denison itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Durant, OK (20 mi, snow) and Sherman, TX (6 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.