Alton climate

Typical historical weather for Alton, United States, averaged across 10 years of hourly climate data. Pick a date for a specific day.

Want today's actual conditions instead? See the current forecast for Alton.

Annual average

15°C

across all months

Warmest month

31.9°C

Jul average high

Coolest month

-2°C

Jan average low

Annual rainfall

1263mm

total per year

Monthly averages

Average daily high/low temperature (band) and monthly rainfall (bars).

● Avg high● Avg low▮ Rainfall

Records on file

Hottest day

39.8°C

8 July 2022

Coldest day

-21.9°C

16 February 2021

Wettest day

97.8mm

14 August 2016

Windiest day

7.7m/s

19 March 2025