Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December, with an average high of 34°F (1.1°C) and a low of 23.9°F (-4.5°C), signifies the coldest month of the year.Humidity
The average relative humidity in December is 82%.Rainfall
In Cascade Valley, Washington, during December, the rain falls for 9.9 days and regularly aggregates up to 0.98" (25mm) of precipitation. In Cascade Valley, during the entire year, the rain falls for 103.1 days and collects up to 7.8" (198mm) of precipitation.Snowfall
January through April, September, November and December are months with snowfall. The month with the most snowfall in Cascade Valley is December, when snow falls for 6.8 days and typically aggregates up to 2.6" (66mm) of snow.Daylight
With an average of 8h and 36min of daylight, December has the shortest days of the year.On the first day of December in Cascade Valley, Washington, 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.
Sunshine
In December, the average sunshine in Cascade Valley is 5h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the average person.Note: The average daily UV index of 2 in December transforms into the following instructions:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Frequently asked questions
What are the coldest months in Cascade Valley?
How cold is it in Cascade Valley in December?
What is the average humidity in December in Cascade Valley?
How many days does it rain in December in Cascade Valley?
What is the snowiest month in Cascade Valley?
How many days does it snow in December in Cascade Valley?
What is the month with the shortest days in Cascade Valley?
How many hours of daylight does Cascade Valley have in December?
What time are sunrise and sunset in December in Cascade Valley?
How long on average sun shines in December in Cascade Valley?
When is the lowest UV index in Cascade Valley?
How high is the UV index in December in Cascade Valley?
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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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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