St Johns Weather Forecast

    • 10
    • 34

    Chance Snow

    • 14
    • 25

    Partly Sunny

    • 33
    • 37

    Rain Likely

    • 24
    • 41

    Chance Snow

    • 16
    • 30

    Chance Snow

    • 4
    • 24

    Mostly Cloudy

Today 7 Dec Mercer

Mostly cloudy. Snow Likely, mainly in the morning. Snow accumulation an inch or less. Highs in the lower 30s. South Winds around 5 Mph, becoming west in the afternoon. Chance of snow 60 percent.

Tonight 7 Dec Mercer

Cloudy with a chance of freezing drizzle with a slight chance of snow. Patchy fog. Near steady Temperatures in the mid 20s. Light and variable Winds, becoming southeast around 5 Mph late. Chance of precipitation 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

St Johns Temperature Statistics

December Temperature

Versailles Darke County Airport (14.3 miles)

  • Lowest 4 December, 2025

    3.2 °F

  • Average December

    22.6 °F

  • Highest 1 December, 2025

    30.2 °F

Climate (2020–Present)

Versailles Darke County Airport (14.3 miles)

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  • Average Low 2020–2025

    43.3 °F

  • Average 2020–2025

    52.3 °F

  • Average High 2020–2025

    61.4 °F
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