Alton Weather & Climate: Best Time to Visit

The climate in Alton is known for significant temperature differences throughout the year, making the weather dynamic. Average daytime temperatures reach a pleasant 21°C (70°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 8°C (46°F).

At night, temperatures range from around 12°C (54°F) in July to 2°C (36°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Generally, Alton receives mid-range precipitation levels, with 870 mm (34 in) annually. Despite minor fluctuations, Alton enjoys fairly consistent precipitation throughout the year. In June, you can expect around 82 mm (3.2 in) of precipitation, while in March, Alton receives about 62 mm (2.4 in). For more details, please visit our Alton Precipitation page.

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

The average number of days each month with precipitation

Alton can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 6.2 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 1.2 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine