The lovely Picture Lake reflecting the trees on the shores and the distant Mount Shuksan in the North Cascades National Park, Washington, USA
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.
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.
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.
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.
Updated: Aug 2, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest?
North Cascades National Park's average lowest temperatures are recorded in January and December, reaching a high of 30.2°F (-1°C).
How cold is it in December?
In December, in North Cascades National Park, the average high-temperature is 30.2°F (-1°C), and the average low-temperature is 17.6°F (-8°C).
What is the rainiest month?
December is the month with the most rainfall. Rain falls for 18 days and accumulates 7.83" (199mm) of precipitation.
How many days does it rain in December?
In North Cascades National Park, during December, the rain falls for 18 days and regularly aggregates up to 7.83" (199mm) of precipitation.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 8h and 18min of daylight.
How many hours of daylight does North Cascades National Park have in December?
In December, the average day length is 8h and 20min.
When are sunrise and sunset in December?
In December, on the first day of the month, 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.
What is the month with the least sunshine?
January, November and December, with an average of 2h of sunshine, are months with the least sunshine.
How many hours of sunshine does North Cascades National Park have in December?
The average sunshine duration in December is 2h.
What is the month with the lowest UV index?
January, November and December, with an average maximum UV index of 1, are months with the lowest UV index.
What is the UV index intensity in December?
In December, the average daily maximum UV index is 1. A UV Index estimate of 2, and below, represents a low health risk from exposure to Sun's UV rays.
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 2min
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).
North Cascades National Park, Washington, USA
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