December weather forecastNorth Cascades National Park, WA
December
Weather in December
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
North Cascades National Park, WA
- Average high temperature in December: 30°F
The warmest months (with the highest average high temperature) are July and August (70°F).
The months with the lowest average high temperature are January and December (30°F).
- Average low temperature in December: 18°F
The months with the highest average low temperature are July and August (45°F).
The coldest months (with the lowest average low temperature) are January and December (18°F).
Average rainfall in December
North Cascades National Park, WA
- Average rainfall in December: 7.8"
The wettest month (with the highest rainfall) is December (7.8").
The driest months (with the least rainfall) are July and August (1.7").
Average rainfall days in December
North Cascades National Park, WA
- Average rainfall days in December: 18 days
The month with the highest number of rainy days is December (18 days).
The month with the least rainy days is July (8 days).
Average daylight in December /
Average sunshine in December
North Cascades National Park, WA
- Average daylight in December: 8h and 18min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in December: 2h
The month with the most sunshine is July (Average sunshine: 9h).
The months with the least sunshine are January, November and December (Average sunshine: 2h).
Average UV index in December
North Cascades National Park, WA
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 1).
