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
Clayton experiences its lowest temperatures in December, with an average peak of 31.3°F (-0.4°C) and a low of 20.3°F (-6.5°C).Humidity
The average relative humidity in December is 89%.Rainfall
In December, the rain falls for 9.2 days. Throughout December, 2.28" (58mm) of precipitation is accumulated. Throughout the year, in Clayton, there are 124.9 rainfall days, and 17.44" (443mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall in Clayton. In Clayton, during December, snow falls for 16.9 days and regularly aggregates up to 10.47" (266mm) of snow. In Clayton, during the entire year, snow falls for 69.2 days and aggregates up to 42.99" (1092mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 30min of daylight.On the first day of the month, sunrise is at 7:19 am and sunset at 3:59 pm. On the last day of December, in Clayton, sunrise is at 7:39 am and sunset at 4:07 pm PST.
Sunshine
In Clayton, Washington, the average sunshine in December is 3.5h.UV index
February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Clayton. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The daily high UV index of 1 in December translates into this advice:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Frequently asked questions
What are the coldest months in Clayton?
How cold is it in Clayton in December?
What is the average humidity in December in Clayton?
How much does it rain in Clayton in December?
How much does it snow in Clayton in December?
What is the month with the shortest days in Clayton?
How many hours of daylight does Clayton have in December?
When are sunrise and sunset in December in Clayton?
How many hours of sunshine does Clayton have in December?
When is the lowest UV index in Clayton?
What is the UV index intensity in December in Clayton?
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 3min
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 3min
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).
Clayton, Washington, USA
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