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
The coldest month is December, with an average high-temperature of 38.3°F (3.5°C) and an average low-temperature of 28.6°F (-1.9°C).Humidity
The average relative humidity in December in Sultan is 87%.Rainfall
In December, the rain falls for 19.9 days. Throughout December, 7.48" (190mm) of precipitation is accumulated. Throughout the year, in Sultan, there are 200.6 rainfall days, and 51.65" (1312mm) of precipitation is accumulated.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
With an average of 8h and 30min of daylight, December has the shortest days of the year in Sultan.On the first day of the month, sunrise is at 7:36 am and sunset at 4:16 pm. On the last day of December, sunrise is at 7:56 am and sunset at 4:24 pm PST.
Sunshine
The months with the least sunshine in Sultan are January and December, with an average of 3.7h of sunshine.UV index
The months with the lowest UV index are January through April, October through December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In December, the maximum UV index of 2 suggests this advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Frequently asked questions
What is the coldest month in Sultan?
How cold is it in Sultan in December?
What is the average humidity in December in Sultan?
How many days does it rain in December in Sultan?
How many days does it snow in December in Sultan?
What is the month with the shortest days in Sultan?
What is the average length of the day in December in Sultan?
When is the sunrise / sunset in December in Sultan?
What is the month with the least sunshine in Sultan?
How many hours of sunshine does Sultan have in December?
When is the lowest UV index in Sultan?
What is the UV index reading in December in Sultan?
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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