December weather forecast
North Cascades National Park, WA

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The lovely Picture Lake reflecting the trees on the shores and the distant Mount Shuksan in the North Cascades National Park, Washington, USA
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 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.
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FAQ

What is the coldest month in North Cascades National Park?

North Cascades National Park's lowest temperatures tend to occur in January and December, with an average high-temperature of 30.2°F.

How cold is December in North Cascades National Park?

In December, in North Cascades National Park, the average high-temperature is 30.2°F, and the average low-temperature is 17.6°F.

What is the wettest month in North Cascades National Park?

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

How much does it rain in North Cascades National Park in December?

In North Cascades National Park, in December, it is raining for 18 days, with typically 7.83" of accumulated precipitation.

What is the month with the shortest days in North Cascades National Park?

The month with the shortest days in North Cascades National Park is December, with an average of 8h and 18min of daylight.

What is the average length of the day in December in North Cascades National Park?

In North Cascades National Park, the average day length in December is 8h and 20min.

When is the sunrise / sunset in December in North Cascades National Park?

In December, on the first day of the month, sunrise is at 7:36 am and sunset at 4:11 pm. On the last day of the month, in North Cascades National Park, Washington, sunrise is at 7:58 am and sunset at 4:18 pm PST.

What is the month with the least sunshine in North Cascades National Park?

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

How many hours of sunshine does North Cascades National Park have in December?

The average sunshine duration in December is 2h.

What are the months with the lowest UV index in North Cascades National Park?

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index.

How high is the UV index in December in North Cascades National Park?

In December, the average daily maximum UV index is 1. A UV Index reading of 2, and below, represents a low health threat from exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average rainfall
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in December
North Cascades National Park, WA

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).

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Average rainfall in December
North Cascades National Park, WA

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").

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Average rainfall days in December
North Cascades National Park, WA

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).

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Average daylight in December /
Average sunshine in December
North Cascades National Park, WA

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).

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Average UV index in December
North Cascades National Park, WA

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).

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North Cascades National Park, Washington, USA

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