December weather forecastRollingbay, WA
December
Weather in December
December, the first month of the winter in Rollingbay, is also a frosty month, with temperature in the range of an average high of 43.5°F (6.4°C) and an average low of 36.3°F (2.4°C).Temperature
December, characterized by an average high temperature of 43.5°F (6.4°C) and a low temperature of 36.3°F (2.4°C), is generally the coldest month.Humidity
January and December, with an average relative humidity of 85%, are the most humid months.Rainfall
December is the month with the most rainfall. Rain falls for 17.5 days and accumulates 3.58" (91mm) of precipitation.Snowfall
January through March, November and December are months with snowfall in Rollingbay. In Rollingbay, Washington, during December, snow falls for 1.5 days and regularly aggregates up to 0.35" (9mm) of snow. Throughout the year, there are 8.7 snowfall days, and 4.25" (108mm) of snow is accumulated.Daylight
December has the shortest days of the year in Rollingbay, with an average of 8h and 30min of daylight.On the first day of December, sunrise is at 7:38 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:58 am and sunset at 4:28 pm PST.
Sunshine
With an average of 4.3h of sunshine, December has the least sunshine of the year.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 low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In December, the maximum UV index of 2 suggests these recommendations:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Rollingbay, WA
- Average high temperature in December: 43.5°F
The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is December (43.5°F).
- Average low temperature in December: 36.3°F
The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is December (36.3°F).
Average pressure in December
Rollingbay, WA
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in December
Rollingbay, WA
- Average wind speed in December: 5.4mph
The windiest month (with the highest average wind speed) is March (6.1mph).
The calmest months (with the lowest average wind speed) are July and August (3.7mph).
Average humidity in December
Rollingbay, WA
- Average humidity in December: 85%
The months with the highest relative humidity are January and December (85%).
The months with the lowest relative humidity are July and August (71%).
Average rainfall in December
Rollingbay, WA
- Average rainfall in December: 3.58"
The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in December
Rollingbay, WA
- Average rainfall days in December: 17.5 days
The month with the highest number of rainy days is March (19.9 days).
The month with the least rainy days is August (5.9 days).
Average snowfall in December
Rollingbay, WA
- Average snowfall in December: 0.35"
The month with the highest snowfall is February (2.32").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Rollingbay, 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
Rollingbay, WA
- Average daylight in December: 8h and 30min
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 30min).
- Average sunshine in December: 4h and 18min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).
Average sunshine days in December
Rollingbay, WA
- Average sunshine days in December: 11.2 days
The month with the most sunshine days is August (22.9 days).
The month with the least sunshine days is November (9.2 days).
Average UV index in December
Rollingbay, WA
- Average UV index in December: 2
The months with the highest UV index are June and 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
Rollingbay, WA
- Average cloud cover in December: 55
The month with the most cloud cover is December (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in December
Rollingbay, 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).
