Best year time to visit Alton

General weather information about Alton

Average annual temperature is 16.8 °C

Absolute maximum temperature: 35.0 °C

Absolute minimum temperature: -3.8 °C

Number of sunny days: 192 days

Number of rainy days: 173 days

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* 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)20.025.527.129.431.231.535.034.933.627.326.520.6
Average daytime temperature (°C)14.217.118.322.524.528.432.131.527.622.816.613.8
Average temperature (°C)9.111.912.416.418.922.526.325.721.917.010.88.5
Average night temperature (°C)5.07.67.110.914.017.421.721.017.012.16.34.1
Absolute minimum temperature (°C)-3.6-3.7-2.32.76.812.218.717.913.25.5-3.4-3.8

Alton monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.013.012.011.010.09.0
Daylight mean duration (h)10.110.912.013.114.014.514.213.412.411.310.49.9
Daylight minimum duration (h)9.010.011.012.013.014.013.012.011.010.010.09.0
Sunshine mean duration (h)6.37.08.48.99.710.911.710.910.18.97.86.5
Precipitation (mm)124851031634211663160683954124
Sunny days16131713171271019242321
Rainy days1515141714182421117710
Snow days000000000000

Alton - weather forecast by months

Alton weather in januaryAlton weather in februaryAlton weather in marchAlton weather in aprilAlton weather in mayAlton weather in juneAlton weather in julyAlton weather in augustAlton weather in septemberAlton weather in octoberAlton weather in novemberAlton weather in december

Best time to visit Alton:

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

  • July — 11.7(h)

The largest precipitation sum in Alton is at

  • January — 124(mm)
  • April — 163(mm)
  • August — 160(mm)
  • December — 124(mm)

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    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.