December weather forecastGreenwater, WA
December
Weather in December
December, the first month of the winter in Greenwater, is also an icy month, with an average temperature varying between 39.9°F (4.4°C) and 30.2°F (-1°C).Temperature
December tends to be the coldest month, with temperatures averaging a daily high of 39.9°F (4.4°C) and a low of 30.2°F (-1°C).Humidity
The average relative humidity in December is 86%.Rainfall
In Greenwater, Washington, in December, during 17.6 rainfall days, 5.59" (142mm) of precipitation is typically accumulated. In Greenwater, during the entire year, the rain falls for 181.2 days and collects up to 38.82" (986mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In December, in Greenwater, it is snowing for 4.1 days. Throughout December, 2.36" (60mm) of snow is accumulated. Throughout the year, there are 20.8 snowfall days, and 14.29" (363mm) of snow is accumulated.Daylight
The month with the shortest days in Greenwater is December, with an average of 8h and 36min of daylight.On the first day of the month, sunrise is at 7:32 am and sunset at 4:18 pm. On the last day of December, sunrise is at 7:52 am and sunset at 4:27 pm PST.
Sunshine
With an average of 3.9h of sunshine, December has the least sunshine of the year.UV index
In Greenwater, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 2 during December translates into these guidelines:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Greenwater, WA
- Average high temperature in December: 39.9°F
The warmest month (with the highest average high temperature) is August (73.9°F).
The month with the lowest average high temperature is December (39.9°F).
- Average low temperature in December: 30.2°F
The month with the highest average low temperature is August (48.9°F).
The coldest month (with the lowest average low temperature) is December (30.2°F).
Average pressure in December
Greenwater, WA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).
Average wind speed in December
Greenwater, WA
- Average wind speed in December: 4.9mph
The windiest month (with the highest average wind speed) is January (5.3mph).
The calmest month (with the lowest average wind speed) is August (3.6mph).
Average humidity in December
Greenwater, WA
- Average humidity in December: 86%
The months with the highest relative humidity are January and February (87%).
The month with the lowest relative humidity is July (70%).
Average rainfall in December
Greenwater, WA
- Average rainfall in December: 5.59"
The wettest month (with the highest rainfall) is January (5.71").
The driest month (with the least rainfall) is July (0.59").
Average rainfall days in December
Greenwater, WA
- Average rainfall days in December: 17.6 days
The month with the highest number of rainy days is March (20.4 days).
The month with the least rainy days is August (6.8 days).
Average snowfall in December
Greenwater, WA
- Average snowfall in December: 2.36"
The month with the highest snowfall is February (4.76").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Greenwater, WA
- Average snowfall days in December: 4.1 days
The month with the highest number of snowfall days is February (5.9 days).
The months with the least snowfall days are June, July, August and October (0 days).
Average daylight in December /
Average sunshine in December
Greenwater, 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: 3h and 54min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
Average sunshine days in December
Greenwater, WA
- Average sunshine days in December: 10.8 days
The month with the most sunshine days is August (22.1 days).
The month with the least sunshine days is February (8.8 days).
Average UV index in December
Greenwater, WA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in December
Greenwater, WA
- Average cloud cover in December: 58
The month with the most cloud cover is March (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in December
Greenwater, WA
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, November and December (4mi).
