St Louis weather in December 2025

Expect daytime maximum temperatures of 6°C in St Louis in December based on long-term weather averages. There are 4 hours of sunshine per day on average with 10 days with some rainfall and typically 68 mm of rainfall in the month.

  • 6°C maximum daytime temperature in December in St Louis6
    6°C max day temperature
  • 4 hours of sunshine per day
  • 10 days with some rainfall in December in St Louis10
    10 days with some rainfall
  • -3°C minimum night-time temperature in December in St Louis-3
    -3°C min night temperature
  • 10 hours of daylight per day in December in St Louis10
    10 hours of daylight per day
  • No heat & humidity in December in St Louis0
    No heat & humidity
  • 68 mm monthly rainfall in December in St Louis68
    68 mm of monthly rainfall
  • UV (maximum) index 2 (Low) in December in St Louis2
    2 (Low) UV index

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The December weather guide for Missouri (St Louis) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How cold is it in St Louis in December?

Daytime temperatures usually reach 6°C in St Louis in December, falling to -3°C at night.

How sunny is it in St Louis in December?

There are normally 4 hours of bright sunshine each day in St Louis in December - that's 44% of daylight hours.

Does it rain in St Louis in December?

There are usually 10 days with some rain in St Louis in December and the average monthly rainfall is 68mm. Rain may fall as snow in this month.

St Louis December sunrise & sunset times

Browse the sunrise and sunset times for St Louis in December 2025. Select a month to view St Louis sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st December 2025 07:00 16:40
Tuesday, 16th December 2025 07:12 16:41
Wednesday, 31st December 2025 07:18 16:50

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