December weather forecast and climate
North Cascades National Park, WA

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

December, the first month of the winter, in North Cascades National Park, is also a subzero cold month, with average temperature ranging between max 30.2°F (-1°C) and min 17.6°F (-8°C).

Temperature

The coldest months are January and December, with an average high-temperature of 30.2°F (-1°C).

Rainfall

December is the month with the most rainfall in North Cascades National Park. Rain falls for 18 days and accumulates 7.83" (199mm) of precipitation.

Daylight

December has the shortest days of the year, with an average of 8.4h of daylight.

Sunshine

Months with the least sunshine are January, November and December, with an average of 2h of sunshine.

UV index

Months with the lowest UV index in North Cascades National Park 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 vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 1 in December transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
[Resources]

FAQ

What are the coldest months in North Cascades National Park?

The coldest months in North Cascades National Park, Washington, are January and December, with an average high-temperature of 30.2°F (-1°C).

What is the temperature in December in North Cascades National Park?

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).

How many days does it rain in December in North Cascades National Park?

In North Cascades National Park, in December, during 18 rainfall days, 7.83" (199mm) of precipitation is typically accumulated.

What is the rainiest month in North Cascades National Park?

December is the month with the most rainfall in North Cascades National Park. Rain falls for 18 days and accumulates 7.83" (199mm) of precipitation.

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

With an average of 8.4h of daylight, December has the shortest days of the year in North Cascades National Park.

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

In December, the average length of the day in North Cascades National Park is 8.4h.

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?

In North Cascades National Park, Washington, the average sunshine 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 in North Cascades National Park.

What is the UV index intensity in December in North Cascades National Park?

In North Cascades National Park, the average daily maximum UV index in December is 1. A UV Index estimate of 2, and below, represents a low health risk from the exposure to the Sun's UV radiation.

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).
Months with the lowest average high temperature are January and December (30°F).

  • Average low temperature in December: 18°F

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).

[Resources]

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").

[Resources]

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).

[Resources]

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: 8.4h

The month with the longest days is June (Average daylight: 16.1h).
The month with the shortest days is December (Average daylight: 8.4h).

  • Average sunshine in December: 2h

The month with the most sunshine is July (Average sunshine: 9h).
Months with the least sunshine are January, November and December (Average sunshine: 2).

[Resources]

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

Months with the highest UV index are June, July and August (UV index 7).
Months with the lowest UV index are January, November and December (UV index 1).

[Resources]