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

The temperature hits its lowest levels in January and December, recording an average high-temperature of 30.2°F (-1°C).

Rainfall

The month with the most rainfall is December, when the rain falls for 18 days and typically aggregates up to 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 the month, sunrise is at 7:37 am and sunset at 4:11 pm. On the last day of December, sunrise is at 7:58 am and sunset at 4:19 pm PST.

Sunshine

The months with the least sunshine 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 reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: During December, 1 as the daily maximum UV index converts into the following advice:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Stay sun-safe with clothing that is both closely woven and worn loosely.