Best year time to visit Alton

General weather information about Alton

Average annual temperature is 11.8 °C

Absolute maximum temperature: 32.6 °C

Absolute minimum temperature: -21.7 °C

Number of sunny days: 165 days

Number of rainy days: 197 days

Number of snow days: 3 days

Look at detailed online map of Alton

* Weather data for Alton United States is based on climate observations for 2026 year

Alton air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)17.119.814.331.528.328.132.329.932.627.817.516.1
Average daytime temperature (°C)7.76.79.116.220.223.428.125.923.019.010.58.9
Average temperature (°C)3.72.24.210.814.418.123.321.318.714.15.64.8
Average night temperature (°C)0.3-2.30.16.39.013.819.517.515.510.41.41.4
Absolute minimum temperature (°C)-5.3-21.7-3.8-1.92.87.214.913.89.35.3-4.9-6.6

Alton monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.015.015.014.013.011.010.09.0
Daylight mean duration (h)9.610.611.913.314.515.114.813.812.511.19.99.2
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)4.16.67.58.811.910.410.910.17.48.07.25.5
Precipitation (mm)1645611610784881751272166538176
Sunny days813161622810811132317
Rainy days2114151492221231918714
Snow days210000000000

Best time to visit Alton:

The best time to visit Alton during the most sunny months:

  • May — 11.9(h)
  • June — 10.4(h)
  • July — 10.9(h)

The largest precipitation sum in Alton is at

  • January — 164(mm)
  • July — 175(mm)
  • September — 216(mm)
  • December — 176(mm)
  • Frequently asked questions

    When is the best time to visit Alton?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Alton.
    What is the weather like in Alton?
    See average temperature, rainfall and daylight hours for Alton by month in the table above.
    How many sunny days does Alton have?
    The monthly weather statistics above show sunshine and rainfall patterns for Alton throughout the year.