St Johns Weather Forecast

    • 21
    • 32

    Mostly Sunny

    • 37
    • 43

    Mostly Cloudy

    • 30
    • 50

    Mostly Cloudy

    • 43
    • 51

    Cloudy

    • 44
    • 59

    Mostly Cloudy

    • 32
    • 53

    Mostly Cloudy

Today 21 Dec Mercer

Sunny. Highs in the lower 30s. Northwest Winds 5 to 10 Mph.

Tonight 21 Dec Mercer

Mostly clear. Lows in the lower 20s. Light and variable Winds, becoming south around 5 Mph after midnight.

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St Johns Temperature Statistics

December Temperature

Versailles Darke County Airport (14.3 miles)

  • Lowest 14 December, 2025

    -4 °F

  • Average December

    25.1 °F

  • Highest 18 December, 2025

    53.6 °F

Climate (2020–Present)

Versailles Darke County Airport (14.3 miles)

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  • Average Low 2020–2025

    43.2 °F

  • Average 2020–2025

    52.3 °F

  • Average High 2020–2025

    61.4 °F
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