Denison climate — normals and trends
Denison (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 17.7 °C and it receives 1,005 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (28.5 °C on average) and the coldest is January (5.8 °C). Rainfall peaks in May.
Denison averages 30 frost days, 98 hot days (≥ 30 °C) and 94 rainy days per year.
Denison has warmed by +1.6 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The number of frost days there went from about 34 to 26 per year over the period.
The hottest day of the period reached 41.8 °C (on 21 July 2018) and the coldest -18.7 °C (on 23 December 1989).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
DenisonTexas
- coords
- 33.76°, -96.54°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
17.7°C
Average daily high
22.7°C
Average daily low
13.1°C
Annual rainfall
1,005mm
Sunshine / day
9.4h
Mean relative humidity
67%
Average peak wind
18.1km/h
Seasonal range
22.7°C
Frost days (< 0 °C)
30 d/yr
Hot days (≥ 30 °C)
98 d/yr
Rainy days (≥ 1 mm)
94 d/yr
Annual snowfall
8.6 cm
Average feels-like high
22.6 °C
Average feels-like low
11.8 °C
Average peak gust
36.7 km/h
Tropical nights (≥ 20 °C)
110 d/yr
Solar radiation
16.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.35 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
41.8 °C
21 July 2018
Coldest day
-18.7 °C
23 December 1989
Wettest day
124 mm
13 May 1982
Windiest day
44.5 km/h
15 March 2001
Strongest gust
100.1 km/h
10 April 2008
Hottest feels-like
45.5 °C
27 June 1980
Coldest feels-like
-24.1 °C
23 December 1989
Snowiest day
19.0 cm
9 January 2025
Sunniest day
13.8 h
26 June 1940
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 9.9 °C | -1.0 °C | 102 mm | +44 mm |
| Feb | 13.6 °C | +0.2 °C | 32 mm | -37 mm |
| Mar | 22.2 °C | +4.3 °C | 89 mm | -9 mm |
| Apr | 23.9 °C | +1.4 °C | 163 mm | +40 mm |
| May | 27.0 °C | +0.4 °C | 154 mm | +5 mm |
| Jun | 31.3 °C | +0.4 °C | 88 mm | 0 mm |
| Jul | 33.8 °C | +0.4 °C | 64 mm | +14 mm |
| Aug | 32.7 °C | -0.9 °C | 53 mm | +7 mm |
| Sep | 31.2 °C | +1.6 °C | 40 mm | -38 mm |
| Oct | 27.0 °C | +2.9 °C | 69 mm | -28 mm |
| Nov | 21.2 °C | +3.8 °C | 78 mm | -6 mm |
| Dec | 15.8 °C | +3.2 °C | 9 mm | -57 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Denison?
Denison has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 17.7 °C and it receives 1,005 mm of precipitation per year.
What is the hottest day ever recorded in Denison?
The hottest day measured in Denison between 1940 and 2025 was 21 July 2018, reaching 41.8 °C.
What is the coldest day in Denison?
The coldest day measured in Denison between 1940 and 2025 was 23 December 1989, at -18.7 °C.
Does it snow in Denison?
Yes. Denison gets on average 8.6 cm of snow per year and has around 30 frost days.
Has the climate of Denison warmed?
Yes: Denison warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Denison?
The wettest day measured in Denison between 1940 and 2025 was 13 May 1982, with 124 mm of rain in 24 hours.
What was the windiest day in Denison?
The windiest day measured in Denison between 1940 and 2025 was 15 March 2001, with winds reaching 44.5 km/h.
What is the warmest month in Denison?
The warmest month in Denison is July (28.5 °C on average); the coldest is January (5.8 °C).
How much does it rain in Denison?
Denison receives on average 1,005 mm of precipitation per year, spread over about 94 rainy days.
Is it sunny in Denison?
Denison gets on average 9.4 hours of sunshine per day, roughly 3,431 hours per year over 1940-2025.
What is the biggest single-day snowfall in Denison?
The heaviest 24-hour snowfall measured in Denison between 1940 and 2025 was 9 January 2025, with 19.0 cm.
Are there tropical nights in Denison?
Yes: Denison has on average 110 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Denison?
In Denison, between 1940 and 2025, the highest apparent temperature reached 45.5 °C on 27 June 1980, and the lowest was -24.1 °C on 23 December 1989.
Compare Denison with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Denison