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
Grand Mound's December weather, with an average high temperature of 42.6°F (5.9°C) and an average low temperature of 33.1°F (0.6°C), tends to be the coldest of the year.Humidity
The average relative humidity in December in Grand Mound, Washington, is 89%.Rainfall
In Grand Mound, during December, the rain falls for 17.9 days and regularly aggregates up to 3.74" (95mm) of precipitation. Throughout the year, there are 168 rainfall days, and 23.94" (608mm) of precipitation is accumulated.Snowfall
January through March, November and December are months with snowfall. In December, in Grand Mound, it is snowing for 1.2 days. Throughout December, 0.31" (8mm) of snow is accumulated. Throughout the year, there are 7.9 snowfall days, and 4.02" (102mm) of snow is accumulated.Daylight
December has the shortest days of the year in Grand Mound, with an average of 8h and 36min of daylight.On the first day of the month, sunrise is at 7:37 am and sunset at 4:25 pm. On the last day of December, sunrise is at 7:56 am and sunset at 4:33 pm PST.
Sunshine
With an average of 3.5h of sunshine, December has the least sunshine of the year in Grand Mound.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Grand Mound. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: The average daily UV index of 2 in December transforms into the following instructions:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Frequently asked questions
What are the coldest months in Grand Mound?
Is December cold in Grand Mound?
What is the average humidity in December in Grand Mound?
How many days does it rain in December in Grand Mound?
How many days does it snow in December in Grand Mound?
What is the month with the shortest days in Grand Mound?
How many hours of daylight does Grand Mound have in December?
What time are sunrise and sunset in December in Grand Mound?
What is the month with the least sunshine in Grand Mound?
How long on average sun shines in December in Grand Mound?
What are the months with the lowest UV index in Grand Mound?
What is the UV index reading in December in Grand Mound?
Average temperature in December
Grand Mound, WA
- Average high temperature in December: 42.6°F
The warmest month (with the highest average high temperature) is August (77.4°F).
The month with the lowest average high temperature is December (42.6°F).
- Average low temperature in December: 33.1°F
The month with the highest average low temperature is August (49.8°F).
The coldest month (with the lowest average low temperature) is December (33.1°F).
Average pressure in December
Grand Mound, WA
- Average pressure in December: 30.08"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 (30.02"Hg).
Average wind speed in December
Grand Mound, WA
- Average wind speed in December: 4.2mph
The windiest months (with the highest average wind speed) are January, March and November (4.5mph).
The calmest month (with the lowest average wind speed) is September (3.6mph).
Average humidity in December
Grand Mound, WA
- Average humidity in December: 89%
The month with the highest relative humidity is November (90%).
The month with the lowest relative humidity is July (73%).
Average rainfall in December
Grand Mound, WA
- Average rainfall in December: 3.74"
The wettest month (with the highest rainfall) is January (3.86").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in December
Grand Mound, WA
- Average rainfall days in December: 17.9 days
The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (5.6 days).
Average snowfall in December
Grand Mound, WA
- Average snowfall in December: 0.31"
The month with the highest snowfall is February (1.54").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Grand Mound, WA
- Average snowfall days in December: 1.2 days
The month with the highest number of snowfall days is February (2.7 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
Grand Mound, WA
- Average daylight in December: 8h and 4min
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 3min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is December (Average sunshine: 3h and 30min).
Average sunshine days in December
Grand Mound, WA
- Average sunshine days in December: 10.8 days
The month with the most sunshine days is August (20.9 days).
The months with the least sunshine days are February and March (9.3 days).
Average UV index in December
Grand Mound, 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
Grand Mound, WA
- Average cloud cover in December: 65
The month with the most cloud cover is January (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 38).
Average visibility in December
Grand Mound, WA
- Average visibility in December: 4mi
The month with the highest visibility is July (5mi).
The months with the lowest visibility are January, February, March, April, May, June, August, September, October, November and December (4mi).
Grand Mound, Washington, USA
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