Denison, United States experiences average highs of 24°C (75°F) and lows of 15°C (59°F) throughout the year. Rainfall is moderate, averaging about 8 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have stayed broadly stable across the available records.
Denison, United States Weather & Climate 2026
Monthly climate averages for Denison, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Feb–Aug At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.4/10
Best: April, May, September, October
UV Index
6
High
Temperature 24°C / 15°C
Feels Like 24°C / 14°C
Rainy Days 8
Rainfall 92 mm
Sunshine 9 h
Humidity 67%
Wind Speed 18 km/h
Dew Point 13°C
Snow Days 1 days
Frost Days 4 days
Hottest Month
34°C
July
Avg Low25°C
Rain7days
Coldest Month
3°C
January
Avg High12°C
Rain7days
Driest Month
6days
September
Avg High31°C
Avg Low22°C
Windiest Month
22 km/h
April (Gusts 45)
Worst Time to Visit
Consider avoiding January, February, July, August due to less favorable weather conditions.
Sun Position
Sunrise 06:16
Daylight 14.4h
Sunset 20:40
Live conditions—
Denison on the map · live conditions
Denison, United States
- Continent
- Americas
- Country
- United States
- City
- Denison
- Population
- 23.2K
- Elevation
- 222 m
- Coordinates
- 33.76°, -96.54°
Seasonal Breakdown
Spring
Mar–May
Avg High 23°C
Avg Low 14°C
Rain 11 days/mo
2/3 best months
Summer
Jun–Aug
Avg High 33°C
Avg Low 24°C
Rain 8 days/mo
Autumn
Sep–Nov
Avg High 25°C
Avg Low 16°C
Rain 6 days/mo
2/3 best months
Winter
Dec–Feb
Avg High 14°C
Avg Low 5°C
Rain 7 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 12°C / 3°C . Feb: 15°C / 5°C . Mar: 20°C / 10°C . Apr: 23°C / 14°C . May: 27°C / 18°C . Jun: 31°C / 23°C . Jul: 34°C / 25°C . Aug: 34°C / 25°C . Sep: 31°C / 22°C . Oct: 25°C / 16°C . Nov: 18°C / 10°C . Dec: 14°C / 6°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 60 mm. Feb: 80 mm. Mar: 122 mm. Apr: 144 mm. May: 154 mm. Jun: 91 mm. Jul: 50 mm. Aug: 74 mm. Sep: 71 mm. Oct: 120 mm. Nov: 73 mm. Dec: 63 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 67%. Feb: 69%. Mar: 67%. Apr: 68%. May: 72%. Jun: 70%. Jul: 64%. Aug: 63%. Sep: 65%. Oct: 63%. Nov: 69%. Dec: 69%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 19 km/h . Feb: 20 km/h . Mar: 21 km/h . Apr: 22 km/h . May: 19 km/h . Jun: 17 km/h . Jul: 16 km/h . Aug: 15 km/h . Sep: 14 km/h . Oct: 18 km/h . Nov: 18 km/h . Dec: 18 km/h .
Sunshine
Sunshine
Sunshine: Jan: 7h. Feb: 7h. Mar: 8h. Apr: 9h. May: 10h. Jun: 12h. Jul: 12h. Aug: 12h. Sep: 10h. Oct: 9h. Nov: 8h. Dec: 7h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 3. Feb: UV 4. Mar: UV 6. Apr: UV 6. May: UV 7. Jun: UV 8. Jul: UV 8. Aug: UV 8. Sep: UV 7. Oct: UV 5. Nov: UV 4. Dec: UV 3.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 2 days. Feb: 1 days. Mar: 0 days. Apr: 0 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 0 days. Dec: 1 days.
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 33°C | Jul · 34°C |
| Coldest month | Jan 2025 · 1°C | Jan · 3°C |
| Wettest month | Apr 2025 · 162 mm | May · 154 mm |
| Windiest month | Mar 2025 · 24 km/h | Apr · 22 km/h |
Month-by-Month Weather Table
January
Fair 
February
Fair March
Good April best
Excellent May best
Excellent June
Fair July
Poor August
Poor September best
Excellent October best
Excellent November
Good December
Fair | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 12°C / 3°C | 9°C / -1°C | 7days (60 mm) Good | 7h Good | 67% Muggy | 3.4 Moderate | Fair | View Details |
| February | 15°C / 5°C | 12°C / 1°C | 8days (80 mm) Wet | 6.9h Fair | 69% Muggy | 4.3 Moderate | Fair | View Details |
| March | 20°C / 10°C | 19°C / 7°C | 10days (122 mm) Wet | 8.3h Good | 67% Muggy | 6 High | Good | View Details |
| April best | 23°C / 14°C | 23°C / 12°C | 10days (144 mm) Wet | 8.9h Good | 68% Muggy | 6.1 High | Excellent | View Details |
| May best | 27°C / 18°C | 29°C / 19°C | 12days (154 mm) Wet | 9.9h Good | 72% Muggy | 7.4 Very High | Excellent | View Details |
| June | 31°C / 23°C | 35°C / 25°C | 8days (91 mm) Wet | 11.6h Excellent | 70% Muggy | 7.9 Very High | Fair | View Details |
| July | 34°C / 25°C | 38°C / 28°C | 7days (50 mm) Good | 12.4h Excellent | 64% Muggy | 7.9 Very High | Poor | View Details |
| August | 34°C / 25°C | 37°C / 28°C | 8days (74 mm) Wet | 11.5h Excellent | 63% Muggy | 7.7 Very High | Poor | View Details |
| September best | 31°C / 22°C | 33°C / 24°C | 6days (71 mm) Good | 10.2h Excellent | 65% Muggy | 6.5 High | Excellent | View Details |
| October best | 25°C / 16°C | 25°C / 15°C | 7days (120 mm) Good | 8.7h Good | 63% Muggy | 5.2 High | Excellent | View Details |
| November | 18°C / 10°C | 17°C / 7°C | 6days (73 mm) Good | 7.5h Good | 69% Muggy | 3.9 Moderate | Good | View Details |
| December | 14°C / 6°C | 12°C / 3°C | 7days (63 mm) Good | 6.5h Fair | 69% Muggy | 3.2 Moderate | Fair | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Denison are April, May, September, October, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Denison, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Denison is July, with average daytime highs of 34°C (93°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Denison is January, with average overnight lows of 3°C (37°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Denison is May, averaging 154mm of precipitation across 12 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Denison runs through May, March, April, with the heaviest rainfall in May. Based on 10-year averages for Denison.
Denison receives approximately 109 sunshine hours per year. The sunniest month is July with around 12 hours. Based on climate data for Denison.
The least favorable months to visit Denison are January, February, July, August, primarily due to less favorable weather conditions. For the best conditions, consider April, May, September, October instead.
The annual average UV index in Denison is 6, classified as high. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Denison is 67%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Denison receives snow. Months with snowfall average 1 snow days and 2 cm (1 in) of accumulation, with about 4 frost days during winter.
Average wind speeds in Denison are 18 km/h (11 mph). The windiest month is April with peak winds reaching 22 km/h (13 mph) (gusts up to 45 km/h / 28 mph).
Denison averages 9 clear-sky days per month with overall cloud cover around 48%. The clearest skies occur in October.
The annual average dew point in Denison is 13°C (55°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
Denison has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Denison ranges from 14°C (57°F) to 24°C (75°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
June is not the best time to visit Denison, with a climate score of 5.3/10. Consider visiting during April, May, September, October instead for better conditions.
For June in Denison, pack Umbrella, Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses. With average highs of 31°C (88°F) and 8 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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