Keystone weather in December 2024

Expect 2°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in Keystone in December. Check more long-term weather averages for Keystone in December before you book your next holiday to South Dakota in 2024/2025.

  • 2°C maximum daytime temperature in December in Keystone2
    2°C max day temperature
  • 5 hours of sunshine per day
  • 7 days with some rainfall in December in Keystone7
    7 days with some rainfall
  • -11°C minimum night-time temperature in December in Keystone-11
    -11°C min night temperature
  • 9 hours of daylight per day in December in Keystone9
    9 hours of daylight per day
  • No heat & humidity in December in Keystone0
    No heat & humidity
  • 11 mm monthly rainfall in December in Keystone11
    11 mm of monthly rainfall
  • UV (maximum) index 1 (Low) in December in Keystone1
    1 (Low) UV index

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