December Weather in Sammamish

Last updated: March 2, 2024

The weather in Sammamish, United States, during December is characterized by an average temperature of 4°C (40°F). Highs can soar to 12°C (53°F), while lows may dip to -5°C (22°F). Typically, the humidity level in Sammamish throughout December hovers around 88%.

-5°C (22°F)

Minimum temperature

4°C (40°F)

Average temperature

12°C (53°F)

Maximum temperature

88%

Humidity

Precipitation and Sunshine hours

In December, Sammamish averages 248 mm (9.8 inches) of rainfall, typically over the course of 19 rainy days. The month enjoys an average of 8 hours 28 minutes of daylight, with the sun shining for approximately 2 hours 51 minutes each day. Additionally, there is a 12% probability of sunny days during this period.

248 mm (9.8 inches)

Precipitation

19 rainy days

Rainy days

2 hours 51 minutes

Sunshine hours

12%

Chance of sun

UV Index

In December, the UV Index in Sammamish reaches a maximum of 2, indicating a level of Low exposure. The most intense UV radiation typically occurs between 12:00 and 14:00, during which unprotected skin may burn in as little as 45 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 1 1 1 2 1 1 1 1 0 0 0
Exposure Low
Time to burn 45 min

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