December Weather in Lake Oswego

Last updated: March 2, 2024

The weather in Lake Oswego, United States, during December is characterized by an average temperature of 5°C (41°F). Highs can soar to 14°C (57°F), while lows may dip to -3°C (26°F). Typically, the humidity level in Lake Oswego throughout December hovers around 87%.

-3°C (26°F)

Minimum temperature

5°C (41°F)

Average temperature

14°C (57°F)

Maximum temperature

87%

Humidity

Precipitation and Sunshine hours

In December, Lake Oswego averages 183 mm (7.2 inches) of rainfall, typically over the course of 19 rainy days. The month enjoys an average of 8 hours 45 minutes of daylight, with the sun shining for approximately 3 hours 42 minutes each day. Additionally, there is a 14% probability of sunny days during this period.

183 mm (7.2 inches)

Precipitation

19 rainy days

Rainy days

3 hours 42 minutes

Sunshine hours

14%

Chance of sun

UV Index

In December, the UV Index in Lake Oswego reaches a maximum of 2, indicating a level of Low exposure. The most intense UV radiation typically occurs between 11:00 and 13:00, 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 2 2 1 1 1 1 0 0 0
Exposure Low
Time to burn 45 min

Compare Lake Oswego's Climate with Cities Worldwide