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 tends to be the coldest month, with temperatures averaging a daily high of 43.5°F (6.4°C) and a low of 37.9°F (3.3°C).Humidity
In December, the average relative humidity in Greenbank is 81%.Rainfall
In December, the rain falls for 18.5 days. Throughout December, 2.64" (67mm) of precipitation is accumulated. In Greenbank, during the entire year, the rain falls for 183.3 days and collects up to 23.03" (585mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Greenbank, during December, snow falls for 1.5 days and regularly aggregates up to 0.31" (8mm) of snow. In Greenbank, during the entire year, snow falls for 9.1 days and aggregates up to 5.63" (143mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 24min of daylight.On the first day of December, sunrise is at 7:40 am and sunset at 4:18 pm. On the last day of the month, sunrise is at 8:00 am and sunset at 4:26 pm PST.
Sunshine
The average sunshine in December is 4.7h.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 value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the average person.Note: The maximum UV index, 2 during December, leads to the following recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
Is December cold?
What is the average humidity in December?
How many days does it rain in December in Greenbank?
How much does it snow in Greenbank in December?
What is the month with the shortest days?
How many hours of daylight does Greenbank have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December in Greenbank?
When is the lowest UV index in Greenbank?
How high is the UV index in December?
Average temperature in December
Greenbank, WA
- Average high temperature in December: 43.5°F
The warmest month (with the highest average high temperature) is August (67.3°F).
The month with the lowest average high temperature is December (43.5°F).
- Average low temperature in December: 37.9°F
The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is December (37.9°F).
Average pressure in December
Greenbank, WA
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in December
Greenbank, WA
- Average wind speed in December: 7.8mph
The windiest month (with the highest average wind speed) is November (8mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in December
Greenbank, WA
- Average humidity in December: 81%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is July (76%).
Average rainfall in December
Greenbank, WA
- Average rainfall in December: 2.64"
The wettest month (with the highest rainfall) is November (3.19").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in December
Greenbank, WA
- Average rainfall days in December: 18.5 days
The month with the highest number of rainy days is March (20.7 days).
The month with the least rainy days is August (6.9 days).
Average snowfall in December
Greenbank, WA
- Average snowfall in December: 0.31"
The month with the highest snowfall is February (3.07").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Greenbank, WA
- Average snowfall days in December: 1.5 days
The month with the highest number of snowfall days is February (3.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Greenbank, WA
- Average daylight in December: 8h and 2min
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 24min).
- Average sunshine in December: 4h and 4min
The months with the most sunshine are July and August (Average sunshine: 10h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in December
Greenbank, WA
- Average sunshine days in December: 9.9 days
The month with the most sunshine days is August (23 days).
The month with the least sunshine days is February (8 days).
Average UV index in December
Greenbank, WA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Greenbank, WA
- Average cloud cover in December: 51
The months with the most cloud cover are January, February and December (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 22).
Average visibility in December
Greenbank, WA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Greenbank, Washington, USA
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