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, having an average high-temperature of 42.6°F (5.9°C) and an average low-temperature of 36.3°F (2.4°C), is the coldest month.Humidity
In Mount Vernon, the average relative humidity in December is 82%.Rainfall
In Mount Vernon, during December, the rain falls for 19.5 days and regularly aggregates up to 4.06" (103mm) of precipitation. Throughout the year, in Mount Vernon, there are 185.2 rainfall days, and 34.72" (882mm) of precipitation is accumulated.Snowfall
Months with snowfall in Mount Vernon are January through April, November and December. In December, it is snowing for 1.5 days. Throughout December, 0.47" (12mm) of snow is accumulated. In Mount Vernon, during the entire year, snow falls for 9.9 days and aggregates up to 7.91" (201mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 24min of daylight.On the first day of December in Mount Vernon, sunrise is at 7:40 am and sunset at 4:16 pm. On the last day of the month, sunrise is at 8:00 am and sunset at 4:24 pm PST.
Sunshine
With an average of 3.9h of sunshine, December has the least sunshine of the year.UV index
The months with the lowest UV index in Mount Vernon, Washington, are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum UV index of 2 during December leads to these instructions:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Frequently asked questions
What part of the year is the coldest in Mount Vernon?
How cold is it in Mount Vernon in December?
What is the average humidity in December in Mount Vernon?
How many days does it rain in December in Mount Vernon?
How much does it snow in Mount Vernon in December?
What is the month with the shortest days in Mount Vernon?
What is the average length of the day in December in Mount Vernon?
When is the sunrise / sunset in December in Mount Vernon?
What is the month with the least sunshine in Mount Vernon?
How many hours of sunshine does Mount Vernon have in December?
When is the lowest UV index in Mount Vernon?
What is the UV index intensity in December in Mount Vernon?
Average temperature in December
Mount Vernon, WA
- Average high temperature in December: 42.6°F
The warmest months (with the highest average high temperature) are July and August (68.4°F).
The month with the lowest average high temperature is December (42.6°F).
- Average low temperature in December: 36.3°F
The month with the highest average low temperature is August (54.1°F).
The coldest month (with the lowest average low temperature) is February (36.1°F).
Average pressure in December
Mount Vernon, 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
Mount Vernon, WA
- Average wind speed in December: 7.2mph
The windiest month (with the highest average wind speed) is November (7.5mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in December
Mount Vernon, WA
- Average humidity in December: 82%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is July (75%).
Average rainfall in December
Mount Vernon, WA
- Average rainfall in December: 4.06"
The wettest month (with the highest rainfall) is November (4.96").
The driest month (with the least rainfall) is July (0.63").
Average rainfall days in December
Mount Vernon, WA
- Average rainfall days in December: 19.5 days
The month with the highest number of rainy days is March (20.8 days).
The month with the least rainy days is August (7.2 days).
Average snowfall in December
Mount Vernon, WA
- Average snowfall in December: 0.47"
The month with the highest snowfall is February (3.54").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Mount Vernon, WA
- Average snowfall days in December: 1.5 days
The month with the highest number of snowfall days is February (3.6 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
Mount Vernon, WA
- Average daylight in December: 8h and 2min
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 24min).
- Average sunshine in December: 3h and 5min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
Average sunshine days in December
Mount Vernon, WA
- Average sunshine days in December: 9.9 days
The month with the most sunshine days is August (22.3 days).
The month with the least sunshine days is November (8.1 days).
Average UV index in December
Mount Vernon, 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, November and December (UV index 2).
Average cloud cover in December
Mount Vernon, WA
- Average cloud cover in December: 59
The month with the most cloud cover is December (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in December
Mount Vernon, WA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Mount Vernon, Washington, USA
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