December weather forecastClayton, WA
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Clayton, Washington, with an average temperature ranging between min 20.3°F (-6.5°C) and max 31.3°F (-0.4°C).Temperature
The month of December sees the lowest average temperatures, reaching 31.3°F (-0.4°C) at the peak and 20.3°F (-6.5°C) at the low.Humidity
In December, the average relative humidity in Clayton is 89%.Rainfall
In Clayton, during December, the rain falls for 9.2 days and regularly aggregates up to 2.28" (58mm) of precipitation. In Clayton, during the entire year, the rain falls for 124.9 days and collects up to 17.44" (443mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. In Clayton, in December, during 16.9 snowfall days, 10.47" (266mm) of snow is typically accumulated. Throughout the year, there are 69.2 snowfall days, and 42.99" (1092mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 8h and 30min of daylight.On the first day of December, sunrise is at 7:19 am and sunset at 3:59 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 4:07 pm PST.
Sunshine
In December, the average sunshine in Clayton is 3.5h.UV index
The months with the lowest UV index are February, November and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: In December, the maximum UV index of 1 transforms into these recommendations:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Clayton, WA
- Average high temperature in December: 31.3°F
The warmest month (with the highest average high temperature) is August (84°F).
The month with the lowest average high temperature is December (31.3°F).
- Average low temperature in December: 20.3°F
The month with the highest average low temperature is August (54.3°F).
The coldest month (with the lowest average low temperature) is December (20.3°F).
Average pressure in December
Clayton, WA
- Average pressure in December: 30.17"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are June and August (29.91"Hg).
Average wind speed in December
Clayton, WA
- Average wind speed in December: 4mph
The windiest month (with the highest average wind speed) is April (5.6mph).
The calmest month (with the lowest average wind speed) is December (4mph).
Average humidity in December
Clayton, WA
- Average humidity in December: 89%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is August (43%).
Average rainfall in December
Clayton, WA
- Average rainfall in December: 2.28"
The wettest month (with the highest rainfall) is January (2.4").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days in December
Clayton, WA
- Average rainfall days in December: 9.2 days
The month with the highest number of rainy days is March (16.2 days).
The month with the least rainy days is August (5.1 days).
Average snowfall in December
Clayton, WA
- Average snowfall in December: 10.47"
The month with the highest snowfall is January (13.23").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Clayton, WA
- Average snowfall days in December: 16.9 days
The month with the highest number of snowfall days is December (16.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Clayton, WA
- Average daylight in December: 8h and 30min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in December: 3h and 30min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in December
Clayton, WA
- Average sunshine days in December: 11.5 days
The month with the most sunshine days is July (24.2 days).
The month with the least sunshine days is March (9.7 days).
Average UV index in December
Clayton, WA
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are February, November and December (UV index 1).
Average cloud cover in December
Clayton, WA
- Average cloud cover in December: 63
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in December
Clayton, WA
- Average visibility in December: 4mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).
