December weather forecastTumwater, WA
December
Weather in December
The first month of the winter, December, is also a frosty month in Tumwater, Washington, with an average temperature ranging between min 33.4°F (0.8°C) and max 43°F (6.1°C).Temperature
December stands out as Tumwater's coldest month, with an average high-temperature of 43°F (6.1°C) and a low-temperature of 33.4°F (0.8°C).Humidity
The months with the highest humidity are January, November and December, with an average relative humidity of 89%.Rainfall
December is the month with the most rainfall. Rain falls for 18.8 days and accumulates 5.79" (147mm) of precipitation.Snowfall
Months with snowfall in Tumwater are January through March, November and December. In Tumwater, in December, during 1.4 snowfall days, 0.31" (8mm) of snow is typically accumulated. In Tumwater, during the entire year, snow falls for 8.7 days and aggregates up to 5.31" (135mm) of snow.Daylight
December has the shortest days of the year in Tumwater, with an average of 8h and 36min of daylight.On the first day of December, sunrise is at 7:37 am and sunset at 4:24 pm. On the last day of the month, sunrise is at 7:57 am and sunset at 4:32 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 3.4h of sunshine.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 of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the average person.Note: A typical high UV index of 2 in December suggests the following recommendations:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Tumwater, WA
- Average high temperature in December: 43°F
The warmest month (with the highest average high temperature) is August (78.6°F).
The month with the lowest average high temperature is December (43°F).
- Average low temperature in December: 33.4°F
The month with the highest average low temperature is August (50.5°F).
The coldest month (with the lowest average low temperature) is December (33.4°F).
Average pressure in December
Tumwater, WA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is March (30.01"Hg).
Average wind speed in December
Tumwater, WA
- Average wind speed in December: 4.2mph
The windiest months (with the highest average wind speed) are March and November (4.6mph).
The calmest month (with the lowest average wind speed) is September (3.8mph).
Average humidity in December
Tumwater, WA
- Average humidity in December: 89%
The months with the highest relative humidity are January, November and December (89%).
The month with the lowest relative humidity is July (71%).
Average rainfall in December
Tumwater, WA
- Average rainfall in December: 5.79"
The wettest month (with the highest rainfall) is December (5.79").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in December
Tumwater, WA
- Average rainfall days in December: 18.8 days
The month with the highest number of rainy days is March (20.4 days).
The month with the least rainy days is August (5.5 days).
Average snowfall in December
Tumwater, WA
- Average snowfall in December: 0.31"
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
Tumwater, WA
- Average snowfall days in December: 1.4 days
The month with the highest number of snowfall days is February (3.3 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
Tumwater, WA
- Average daylight in December: 8h and 36min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in December: 3h and 24min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 3h and 24min).
Average sunshine days in December
Tumwater, WA
- Average sunshine days in December: 9.8 days
The month with the most sunshine days is August (22.4 days).
The month with the least sunshine days is February (8.4 days).
Average UV index in December
Tumwater, 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
Tumwater, WA
- Average cloud cover in December: 65
The months with the most cloud cover are January and December (Cloud cover 65).
The months with the least cloud cover are July and August (Cloud cover 35).
Average visibility in December
Tumwater, WA
- Average visibility in December: 4mi
The months with the highest visibility are June, July and August (5mi).
The months with the lowest visibility are January, February, March, April, May, September, October, November and December (4mi).
