Best year time to visit Illiana (historical)

General weather information about Illiana (historical)

Average annual temperature is 13.0 °C

Absolute maximum temperature: 36.5 °C

Absolute minimum temperature: -12.3 °C

Number of sunny days: 197 days

Number of rainy days: 162 days

Number of snow days: 6 days

Look at detailed online map of Illiana (historical)

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

Illiana (historical) air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)18.218.920.926.431.233.335.536.532.329.024.415.7
Average daytime temperature (°C)6.210.111.118.824.728.829.428.526.219.112.58.6
Average temperature (°C)2.33.75.211.618.122.423.923.220.514.06.84.3
Average night temperature (°C)-0.7-0.80.65.811.816.218.818.415.49.72.31.4
Absolute minimum temperature (°C)-11.6-12.3-8.4-2.12.79.714.712.411.0-3.0-8.8-7.6

Illiana (historical) monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)10.011.012.013.014.014.014.014.013.011.010.09.0
Daylight mean duration (h)9.710.712.013.314.414.914.713.712.511.210.09.4
Daylight minimum duration (h)9.010.011.012.013.014.014.013.011.010.09.09.0
Sunshine mean duration (h)3.87.56.49.311.012.012.411.110.37.37.74.8
Precipitation (mm)859813287317611612430822266
Sunny days121614191821111517152217
Rainy days1511161113920161316814
Snow days411000000000

Illiana (historical) - weather forecast by months

Illiana (historical) weather in januaryIlliana (historical) weather in februaryIlliana (historical) weather in marchIlliana (historical) weather in aprilIlliana (historical) weather in mayIlliana (historical) weather in juneIlliana (historical) weather in julyIlliana (historical) weather in augustIlliana (historical) weather in septemberIlliana (historical) weather in octoberIlliana (historical) weather in novemberIlliana (historical) weather in december

Best time to visit Illiana (historical):

The best time to visit Illiana (historical) during the most sunny months:

  • May — 11.0(h)
  • June — 12.0(h)
  • July — 12.4(h)
  • August — 11.1(h)

The largest precipitation sum in Illiana (historical) is at

  • March — 132(mm)
  • July — 116(mm)
  • August — 124(mm)

    • Weather forecast in the closest to Illiana (historical) admin centers

    Weather forecast in the closest towns to Illiana (historical)

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    Frequently asked questions

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