Best year time to visit Alton (historical)

General weather information about Alton (historical)

Average annual temperature is 19.6 °C

Absolute maximum temperature: 38.0 °C

Absolute minimum temperature: -1.6 °C

Number of sunny days: 166 days

Number of rainy days: 199 days

Look at detailed online map of Alton (historical)

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

Alton (historical) air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)25.929.431.232.131.634.238.035.833.528.627.023.9
Average daytime temperature (°C)19.122.324.026.427.131.034.132.929.724.819.916.6
Average temperature (°C)12.516.017.219.621.324.927.927.423.818.914.111.5
Average night temperature (°C)7.511.411.614.116.420.223.123.019.214.39.97.6
Absolute minimum temperature (°C)-1.61.71.37.89.116.020.221.515.08.0-0.3-0.4

Alton (historical) monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.013.012.011.010.010.0
Daylight mean duration (h)10.311.112.013.013.814.214.013.312.411.410.510.1
Daylight minimum duration (h)10.010.011.012.013.014.013.012.011.010.010.010.0
Sunshine mean duration (h)7.38.48.89.510.110.711.311.510.19.06.76.4
Precipitation (mm)103955915713011697134846448120
Sunny days17151313868716231822
Rainy days1413181723242324148129
Snow days000000000000

Alton (historical) - weather forecast by months

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

Best time to visit Alton (historical):

The largest precipitation sum in Alton (historical) is at

  • April — 157(mm)
  • May — 130(mm)
  • August — 134(mm)

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    Frequently asked questions

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