Barnhart Weather Forecast

    • 34
    • 37

    Decreasing Clouds

    • 21
    • 41

    Mostly Cloudy

    • 7
    • 32

    Mostly Cloudy

    • 11
    • 21

    Mostly Sunny

    • 27
    • 41

    Partly Sunny

    • 36
    • 46

    Mostly Cloudy

Today 11 Dec Jefferson

Mostly cloudy. Cooler with Highs in the upper 30s. Southwest Winds around 5 Mph, becoming south in the afternoon.

Tonight 11 Dec Jefferson

Mostly cloudy. Near steady temperature in the mid 30s. South Winds around 5 Mph, becoming west after midnight.

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Barnhart Temperature Statistics

December Temperature

St. Louis Downtown Airport (19.9 miles)

  • Lowest 5 December, 2025

    10 °F

  • Average December

    28.9 °F

  • Highest 6 December, 2025

    48.9 °F

Climate (2020–Present)

St. Louis Downtown Airport (19.9 miles)

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  • Average Low 2020–2025

    47.5 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    68.6 °F
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