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
With an average high-temperature of 38.3°F (3.5°C) and an average low-temperature of 28.6°F (-1.9°C), December is the coldest month.Humidity
In December, the average relative humidity is 87%.Rainfall
In Sultan, during December, the rain falls for 19.9 days and regularly aggregates up to 7.48" (190mm) of precipitation. In Sultan, during the entire year, the rain falls for 200.6 days and collects up to 51.65" (1312mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Sultan, in December, snow falls for 3 days, with typically accumulated 1.65" (42mm) of snow. Throughout the year, there are 15.9 snowfall days, and 14.41" (366mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 30min of daylight.On the first day of December, sunrise is at 7:36 am and sunset at 4:16 pm. On the last day of the month, sunrise is at 7:56 am and sunset at 4:24 pm PST.
Sunshine
January and December, with an average of 3.7h of sunshine, are months with the least sunshine.UV index
January through April, October through 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 minimal health vulnerability from unsafe exposure to UV radiation for average individuals.Note: A daily maximum UV index of 2 in December translates into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest?
Is December cold?
What is the average humidity in December in Sultan?
How much does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Sultan have in December?
When is the sunrise / sunset in December?
What are the months with the least sunshine?
How many hours of sunshine does Sultan have in December?
What is the month with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Sultan, WA
- Average high temperature in December: 38.3°F
The warmest month (with the highest average high temperature) is August (73.4°F).
The month with the lowest average high temperature is December (38.3°F).
- Average low temperature in December: 28.6°F
The month with the highest average low temperature is August (48°F).
The coldest month (with the lowest average low temperature) is December (28.6°F).
Average pressure in December
Sultan, 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
Sultan, WA
- Average wind speed in December: 4.4mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest month (with the lowest average wind speed) is August (3.2mph).
Average humidity in December
Sultan, WA
- Average humidity in December: 87%
The months with the highest relative humidity are January, February and March (88%).
The month with the lowest relative humidity is July (72%).
Average rainfall in December
Sultan, WA
- Average rainfall in December: 7.48"
The wettest month (with the highest rainfall) is January (7.8").
The driest month (with the least rainfall) is August (0.79").
Average rainfall days in December
Sultan, WA
- Average rainfall days in December: 19.9 days
The month with the highest number of rainy days is March (22.3 days).
The month with the least rainy days is August (7.9 days).
Average snowfall in December
Sultan, WA
- Average snowfall in December: 1.65"
The month with the highest snowfall is February (5.43").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Sultan, WA
- Average snowfall days in December: 3 days
The month with the highest number of snowfall days is February (5.2 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
Sultan, WA
- Average daylight in December: 8h and 3min
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 30min).
- Average sunshine in December: 3h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are January and December (Average sunshine: 3h and 42min).
Average sunshine days in December
Sultan, WA
- Average sunshine days in December: 9.4 days
The month with the most sunshine days is August (19.9 days).
The month with the least sunshine days is March (7 days).
Average UV index in December
Sultan, 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, March, April, October, November and December (UV index 2).
Average cloud cover in December
Sultan, WA
- Average cloud cover in December: 61
The months with the most cloud cover are March and December (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in December
Sultan, 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).
Sultan, Washington, USA
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