Best year time to visit Alton

General weather information about Alton

Average annual temperature is 10.4 °C

Absolute maximum temperature: 35.7 °C

Absolute minimum temperature: -20.8 °C

Number of sunny days: 168 days

Number of rainy days: 168 days

Number of snow days: 29 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)7.712.416.127.533.435.732.732.031.828.816.513.7
Average daytime temperature (°C)2.43.86.715.622.727.827.725.923.115.88.56.2
Average temperature (°C)-0.6-1.31.68.915.320.822.020.218.011.43.93.1
Average night temperature (°C)-2.9-5.6-2.33.68.714.517.015.713.78.10.51.0
Absolute minimum temperature (°C)-20.8-20.3-11.1-4.41.59.013.19.47.1-0.3-8.1-5.3

Alton monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.011.012.014.015.015.015.014.013.011.010.09.0
Daylight mean duration (h)9.410.511.913.414.715.315.013.912.511.09.89.1
Daylight minimum duration (h)9.09.011.012.014.015.014.013.011.010.09.09.0
Sunshine mean duration (h)2.86.36.59.010.411.612.010.38.05.76.23.3
Precipitation (mm)58101102793048145152401186350
Sunny days9131313201810161691714
Rainy days12101116111221151421916
Snow days1057100000141

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:

  • May — 10.4(h)
  • June — 11.6(h)
  • July — 12.0(h)
  • August — 10.3(h)

Months with the longest average daylight duration in Alton:

  • June — 15.3(h)

The largest precipitation sum in Alton is at

  • July — 145(mm)
  • August — 152(mm)
  • October — 118(mm)

    • Weather forecast in the closest to Alton admin centers

    Weather forecast in the closest towns to Alton

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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.