December weather forecast
North Cascades National Park, WA

By December, winter is in full swing at North Cascades National Park. The weather is dominated by low temperatures from 18°F (-7.8°C) to 30°F (-1.1°C) and shorter days. This period is characterized by increased precipitation and more rainy days, reaching the highest levels compared to the rest of the months. The park is cloaked in snow, and sparkling icy scenes are commonplace, providing a surreal ambiance. With a mere 2 hours of sunshine a day, the landscape remains predominantly overcast, limiting outdoor activities.

Temperature

January and December are the coldest months in North Cascades National Park, with an average high-temperature of 30.2°F (-1°C).

Rainfall

December is the month with the most rainfall. Rain falls for 18 days and accumulates 7.83" (199mm) of precipitation.

Daylight

The month with the shortest days is December, with an average of 8h and 18min of daylight.
On the first day of December, sunrise is at 7:37 am and sunset at 4:11 pm. On the last day of the month, sunrise is at 7:58 am and sunset at 4:19 pm PST.

Sunshine

The months with the least sunshine in North Cascades National Park are January, November and December, with an average of 2h of sunshine.

UV index

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index in North Cascades National Park. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum daily UV index of 1 during December translates into the following directions:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.