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, with average temperatures reaching a high of 43.5°F (6.4°C) and a low of 34.3°F (1.3°C), is the coldest month.Humidity
The months with the highest humidity are January and December, with an average relative humidity of 85%.Rainfall
The month with the most rainfall is December, when the rain falls for 13.5 days and typically aggregates up to 2.2" (56mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In December, it is snowing for 1.6 days. Throughout December, 0.47" (12mm) of snow is accumulated. In Tukwila, during the entire year, snow falls for 9.8 days and aggregates up to 4.72" (120mm) of snow.Daylight
December has the shortest days of the year in Tukwila, with an average of 8h and 30min of daylight.On the first day of December, sunrise is at 7:36 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:56 am and sunset at 4:28 pm PST.
Sunshine
December has the least sunshine of the year in Tukwila, with an average of 4.1h of sunshine.UV index
The months with the lowest UV index in Tukwila 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 ordinary person.Note: A maximum UV index of 2 in December translates into the following recommendations:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest in Tukwila?
How cold is December in Tukwila?
What are the most humid months in Tukwila?
What is the average humidity in December in Tukwila?
What is the rainiest month in Tukwila?
How much does it rain in Tukwila in December?
How many days does it snow in December in Tukwila?
What is the month with the shortest days in Tukwila?
How many hours of daylight does Tukwila have in December?
When are sunrise and sunset in December in Tukwila?
What is the month with the least sunshine in Tukwila?
How many hours of sunshine does Tukwila have in December?
What are the months with the lowest UV index in Tukwila?
What is the UV index intensity in December in Tukwila?
Average temperature in December
Tukwila, WA
- Average high temperature in December: 43.5°F
The warmest month (with the highest average high temperature) is August (77.7°F).
The month with the lowest average high temperature is December (43.5°F).
- Average low temperature in December: 34.3°F
The month with the highest average low temperature is August (53.6°F).
The coldest month (with the lowest average low temperature) is December (34.3°F).
Average pressure in December
Tukwila, WA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in December
Tukwila, WA
- Average wind speed in December: 4.8mph
The windiest month (with the highest average wind speed) is March (5.3mph).
The calmest months (with the lowest average wind speed) are July and August (3.6mph).
Average humidity in December
Tukwila, WA
- Average humidity in December: 85%
The months with the highest relative humidity are January and December (85%).
The month with the lowest relative humidity is July (68%).
Average rainfall in December
Tukwila, WA
- Average rainfall in December: 2.2"
The wettest month (with the highest rainfall) is December (2.2").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in December
Tukwila, WA
- Average rainfall days in December: 13.5 days
The month with the highest number of rainy days is April (14.9 days).
The month with the least rainy days is August (5.7 days).
Average snowfall in December
Tukwila, WA
- Average snowfall in December: 0.47"
The month with the highest snowfall is February (2.52").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Tukwila, WA
- Average snowfall days in December: 1.6 days
The month with the highest number of snowfall days is February (3.4 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
Tukwila, WA
- Average daylight in December: 8h and 3min
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 1min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).
Average sunshine days in December
Tukwila, WA
- Average sunshine days in December: 14.2 days
The month with the most sunshine days is August (22.8 days).
The month with the least sunshine days is February (13 days).
Average UV index in December
Tukwila, WA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Tukwila, WA
- Average cloud cover in December: 58
The month with the most cloud cover is December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in December
Tukwila, WA
- Average visibility in December: 5mi
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, October, November and December (5mi).
Tukwila, Washington, USA
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