December weather forecastCascade Valley, WA
December
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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 36min
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).
