Fort Collins (CO) Weather & Climate: Best Time to Visit

In Fort Collins, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a very warm 31°C (88°F) in July to a chilly 5°C (41°F) in December.

Nighttime temperatures range from 15°C (59°F) in July to -10°C (14°F) in December.

Check out our detailed temperature page for more information.

Temperature ranges by month

Fort Collins typically sees modest rain/snowfall throughout the year, with an average annual precipitation of 404 mm (16 in). The seasons in Fort Collins bring significant changes in precipitation. The wettest month, May, receives moderate rainfall, with an average of 71 mm (2.8 in) of precipitation. This rainfall is distributed across 12 rainy days.

In contrast, the driest month, January, experiences much less snow/rainfall, totaling 9.5 mm (0.4 in) over 3 snowy/rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Fort Collins Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

In Fort Collins, summer days are longer and more sunny, with daily sunshine hours peaking at 10.7 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 5.9 hours per average day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is moderate throughout the year in Fort Collins.

The city experiences its highest humidity in March, reaching 57%. In October, the humidity drops to its lowest level at 51%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year