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 to 30°F 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

In North Cascades National Park, the coldest period comes during January and December, when the average high-temperature touches 30.2°F.

Rainfall

The month with the most rainfall is December, when the rain falls for 18 days and typically aggregates up to 7.83" of precipitation.

Daylight

With an average of 8h and 18min of daylight, December has the shortest days of the year.
On the first day of December in North Cascades National Park, sunrise is at 7:36 am and sunset at 4:11 pm. On the last day of the month, sunrise is at 7:58 am and sunset at 4:18 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

The months with the lowest UV index are January, November and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: An average UV index of 1 in December transforms into this advice:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.