Dillon (MT) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Dillon.
Climate overview of Dillon
The climate in Dillon, Montana, United States of America, is marked by large temperature swings across the seasons, ranging from 30°C (86°F) in July to 0°C (32°F) in December.
The city has a relatively dry climate, receiving around 288 mm (11 in) of rain/snowfall per year. It does experience a distinct dry season from July to April, with warm summers and very cold winters. May is the wettest month and January the driest.
Dillon Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Dillon - and find the best time to visit.
Monthly Temperature in Dillon
In Dillon, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a comfortable 30°C (86°F) in July to a very cold 0°C (32°F) in December.
Nighttime temperatures range from 10°C (50°F) in July to -11°C (12°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Dillon
Dillon's climate is marked by below-average rain/snowfall, accumulating 288 mm (11 in) of precipitation yearly. The seasons in Dillon bring significant changes in precipitation. The wettest month, May, receives moderate rainfall, with an average of 51 mm (2 in) of precipitation. This rainfall is distributed across 11 rainy days.
In contrast, the driest month, January, experiences much less snowfall, totaling 4.9 mm (0.2 in) over 4 snowy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Dillon 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 Dillon
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: June, August and September
- Warmest weather: July
- Seasonal pattern: A distinct dry season from July to April, with warm summers and very cold winters
- Coldest conditions: December, with freezing nights around -11°C (12°F).
Frequently asked questions about the climate in Dillon
What is the best time to visit Dillon?
June, August and September typically offer the most optimal weather in Dillon. In contrast, January, February and December tend to have less optimal conditions. Dillon has a distinct dry season from July to April, with warm summers and very cold winters.
What temperatures can I expect in Dillon?
Daytime highs range from 0°C (32°F) in December to 30°C (86°F) in July. Nighttime lows range from -11°C (12°F) to 10°C (50°F). Temperatures vary considerably through the year.
How much rain does Dillon get?
Annual rainfall is around 288 mm (11 in). May is the wettest month with 51 mm (2 in), while January is the driest with 4.9 mm (0.2 in).
Dillon 3-Day Forecast
Dillon on the map
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