December Weather in Keystone

Last updated: March 2, 2024

The weather in Keystone, United States, during December is characterized by an average temperature of -11°C (13°F). Highs can soar to 4°C (40°F), while lows may dip to -26°C (-15°F). Typically, the humidity level in Keystone throughout December hovers around 89%.

-26°C (-15°F)

Minimum temperature

-11°C (13°F)

Average temperature

4°C (40°F)

Maximum temperature

89%

Humidity

Precipitation and Sunshine hours

In December, Keystone averages 43 mm (1.7 inches) of rainfall, typically over the course of 10 rainy days. The month enjoys an average of 9 hours 25 minutes of daylight, with the sun shining for approximately 7 hours 39 minutes each day. Additionally, there is a 53% probability of sunny days during this period.

43 mm (1.7 inches)

Precipitation

10 rainy days

Rainy days

7 hours 39 minutes

Sunshine hours

53%

Chance of sun

UV Index

In December, the UV Index in Keystone reaches a maximum of 4, indicating a level of Moderate exposure. The most intense UV radiation typically occurs between 11:00 and 13:00, during which unprotected skin may burn in as little as 30 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 0 1 2 2 3 3 3 2 1 1 0 0 0
Exposure Low Moderate Low
Time to burn 45 min 30 min 45 min

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