Chatham Weather Forecast

    • 0
    • 20

    Areas Freezing Fog

    • 23
    • 32

    Patchy Freezing Fog

    • 23
    • 32

    Chance Snow

    • 7
    • 29

    Mostly Cloudy

    • 16
    • 26

    Mostly Cloudy

    • 27
    • 36

    Mostly Cloudy

    • 17
    • 39

    Chance Rain

Today 4 Dec Sangamon

Sunny. Much cooler with Highs around 18. Northeast Winds around 5 Mph.

Tonight 4 Dec Sangamon

Mostly clear this Evening, then becoming partly cloudy. Patchy freezing fog this Evening, then Areas of freezing fog after midnight. Cold with Lows around 1 below. East Winds around 5 Mph, becoming south around 5 Mph after midnight.

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Chatham Temperature Statistics

December Temperature

Springfield - Abraham Lincoln Capital Airport (11.2 miles)

  • Lowest 1 December, 2025

    15.1 °F

  • Average December

    22 °F

  • Highest 1 December, 2025

    26.1 °F

Climate (2020–Present)

Springfield - Abraham Lincoln Capital Airport (11.2 miles)

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  • Average Low 2020–2025

    45 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    65.1 °F
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