December weather forecast
Cascade Valley, WA

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Weather in December

The first month of the winter, December, is still a cold month in Cascade Valley, Washington, with an average temperature ranging between min 23.9°F (-4.5°C) and max 34°F (1.1°C).

Temperature

The coldest month is December, with an average high-temperature of 34°F (1.1°C) and an average low-temperature of 23.9°F (-4.5°C).

Humidity

In Cascade Valley, the average relative humidity in December is 82%.

Rainfall

In Cascade Valley, in December, during 9.9 rainfall days, 0.98" (25mm) of precipitation is typically accumulated. Throughout the year, there are 103.1 rainfall days, and 7.8" (198mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, September, November and December. December is the month with the most snowfall. Snow falls for 6.8 days and accumulates 2.6" (66mm) of snow.

Daylight

The month with the shortest days is December, with an average of 8h and 36min of daylight.
On the first day of the month, sunrise is at 7:23 am and sunset at 4:09 pm. On the last day of December, sunrise is at 7:43 am and sunset at 4:17 pm PST.

Sunshine

The average sunshine in December is 5h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, a regular UV index of 2 translates into these guidelines:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Updated: Aug 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month?

December is the coldest month, exhibiting average temperatures of 34°F (1.1°C) at the peak and 23.9°F (-4.5°C) at the base.

How cold is it in December?

The average high-temperature and low-temperature during December are 34°F (1.1°C) and 23.9°F (-4.5°C) respectively.

What is the average humidity in December?

The average relative humidity in December is 82%.

How many days does it rain in December?

In Cascade Valley, in December, it is raining for 9.9 days, with typically 0.98" (25mm) of accumulated precipitation.

What is the snowiest month in Cascade Valley?

The month with the most snowfall is December, when snow falls for 6.8 days and typically aggregates up to 2.6" (66mm) of snow.

How many days does it snow in December?

In Cascade Valley, in December, snow falls for 6.8 days, with typically accumulated 2.6" (66mm) of snow.

What is the month with the shortest days?

With an average of 8h and 36min of daylight, December has the shortest days of the year.

What is the average length of the day in December in Cascade Valley?

The average day length in December is 8h and 34min.

When are sunrise and sunset in December in Cascade Valley?

On the first day of December, sunrise is at 7:23 am and sunset at 4:09 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 4:17 pm PST.

How many hours of sunshine does Cascade Valley have in December?

In Cascade Valley, the average sunshine duration in December is 5h.

What is the month with the lowest UV index?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Cascade Valley, WA

Average temperature in December - Cascade Valley, WA
  • Average high temperature in December: 34°F

The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is December (34°F).

  • Average low temperature in December: 23.9°F

The month with the highest average low temperature is August (62.2°F).
The coldest month (with the lowest average low temperature) is December (23.9°F).

Average pressure in December
Cascade Valley, WA

Average pressure in December - Cascade Valley, WA
  • Average pressure in December: 30.15"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).

Average wind speed in December
Cascade Valley, WA

Average wind speed in December - Cascade Valley, WA
  • Average wind speed in December: 5.5mph

The windiest month (with the highest average wind speed) is April (7.9mph).
The calmest months (with the lowest average wind speed) are January and December (5.5mph).

Average humidity in December
Cascade Valley, WA

Average humidity in December - Cascade Valley, WA
  • Average humidity in December: 82%

The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are July and August (36%).

Average rainfall in December
Cascade Valley, WA

Average rainfall in December - Cascade Valley, WA
  • Average rainfall in December: 0.98"

The wettest month (with the highest rainfall) is January (1.02").
The driest month (with the least rainfall) is August (0.2").

Average rainfall days in December
Cascade Valley, WA

Average rainfall days in December - Cascade Valley, WA
  • Average rainfall days in December: 9.9 days

The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is July (3.8 days).

Average snowfall in December
Cascade Valley, WA

Average snowfall in December - Cascade Valley, WA
  • Average snowfall in December: 2.6"

The month with the highest snowfall is December (2.6").
The months with the least snowfall are May, June, July, August and October (0").

Average snowfall days in December
Cascade Valley, WA

Average snowfall days in December - Cascade Valley, WA
  • Average snowfall days in December: 6.8 days

The month with the highest number of snowfall days is December (6.8 days).
The months with the least snowfall days are May, June, July, August and October (0 days).

Average daylight in December /
Average sunshine in December
Cascade Valley, WA

Average daylight in December / Average sunshine in December - Cascade Valley, WA
  • Average daylight in December: 8h and 4min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 36min).

  • Average sunshine in December: 5h and 0min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).

Average sunshine days in December
Cascade Valley, WA

Average sunshine days in December - Cascade Valley, WA
  • Average sunshine days in December: 16.7 days

The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is March (14.2 days).

Average UV index in December
Cascade Valley, WA

Average UV index in December - Cascade Valley, WA
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Cascade Valley, WA

Average cloud cover in December - Cascade Valley, WA
  • Average cloud cover in December: 47

The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 11).

Average visibility in December
Cascade Valley, WA

Average visibility in December - Cascade Valley, WA
  • Average visibility in December: 5mi

The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).

Cascade Valley, Washington, USA

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