Yosemite National Park is definitely worth a visit
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Denison (IA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Denison.
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Climate overview of Denison
Denison, Iowa, United States of America, experiences significant temperature variation throughout the year. Summers bring daytime highs of 29°C (84°F) in July, while winters cool to -2°C (28°F) in January.
The city receives around 923 mm (36 in) of rain/snowfall per year. It experiences a distinct dry season from January to March, with warm summers and very cold winters. August is the wettest month and January the driest.
Denison Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Denison - and find the best time to visit.
Monthly Temperature in Denison
Depending on the time of the year, temperatures range from comfortable to very cold in Denison. On average, daytime temperatures range from a comfortable 29°C (84°F) in July to a very cold -2°C (28°F) in January.
Nighttime temperatures range from 17°C (63°F) in July to -12°C (10°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Denison
Generally, Denison has a moderate amount of precipitation, averaging 923 mm (36 in) of rain/snowfall annually. The seasons in Denison bring significant changes in precipitation. The wettest month, August, receives high rainfall, with an average of 140 mm (5.5 in) of precipitation. This rainfall is distributed across 11 rainy days.
In contrast, the driest month, January, experiences much less snowfall, totaling 16 mm (0.6 in) over 6 snowy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Denison Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Denison
The most comfortable overall weather for exploring Denison is usually found in September. Conditions are generally least comfortable in January, February, March, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
very cold
Feb
cold
Mar
cold
Apr
mixed
May
very good
Jun
very good
Jul
very good
Aug
very good
Sep
excellent
Oct
good
Nov
cold
Dec
cold
- Best overall: September
- Warmest weather: July and August
- Fewest rainy days: January and November
- Wettest months: April, May, June, July, August and September, when rainfall is highest.
- Seasonal pattern: A distinct dry season from January to March, with warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -12°C (10°F).
Frequently asked questions about the climate in Denison
What is the best time to visit Denison?
September typically offers the most optimal weather in Denison. In contrast, January, February, March, November and December tend to have less optimal conditions. Denison has a distinct dry season from January to March, with warm summers and very cold winters.
What temperatures can I expect in Denison?
Daytime highs range from -2°C (28°F) in January to 29°C (84°F) in July. Nighttime lows range from -12°C (10°F) to 17°C (63°F). Temperatures vary considerably through the year.
How much rain does Denison get?
Annual rainfall is around 923 mm (36 in). August is the wettest month with 140 mm (5.5 in), while January is the driest with 16 mm (0.6 in).
Denison 3-Day Forecast
Denison on the map
Denison is highlighted - select any city to see its climate.
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