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 period tends to be December, when average temperatures fluctuate between a high of 30.6°F (-0.8°C) and a low of 18.7°F (-7.4°C).Humidity
The average relative humidity in December in Plain is 90%.Rainfall
In December, in Plain, the rain falls for 13 days. Throughout December, 3.86" (98mm) of precipitation is accumulated. Throughout the year, there are 159.9 rainfall days, and 25.63" (651mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. In Plain, Washington, during December, snow falls for 17 days and regularly aggregates up to 15.28" (388mm) of snow. Throughout the year, there are 73.4 snowfall days, and 57.99" (1473mm) of snow is accumulated.Daylight
With an average of 8h and 30min of daylight, December has the shortest days of the year in Plain.On the first day of December in Plain, Washington, sunrise is at 7:31 am and sunset at 4:12 pm. On the last day of the month, sunrise is at 7:51 am and sunset at 4:20 pm PST.
Sunshine
In Plain, the average sunshine in December is 4.4h.UV index
The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The daily high UV index of 2 during December translates into the following recommendations:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month in Plain?
How cold is December in Plain?
What is the average humidity in December in Plain?
How much does it rain in Plain in December?
How many days does it snow in December in Plain?
What is the month with the shortest days in Plain?
What is the average length of the day in December in Plain?
When is the sunrise / sunset in December in Plain?
How many hours of sunshine does Plain have in December?
How high is the UV index in December in Plain?
Average temperature in December
Plain, WA
- Average high temperature in December: 30.6°F
The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is December (30.6°F).
- Average low temperature in December: 18.7°F
The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is December (18.7°F).
Average pressure in December
Plain, WA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is August (29.95"Hg).
Average wind speed in December
Plain, WA
- Average wind speed in December: 3.5mph
The windiest month (with the highest average wind speed) is June (5.7mph).
The calmest month (with the lowest average wind speed) is December (3.5mph).
Average humidity in December
Plain, WA
- Average humidity in December: 90%
The month with the highest relative humidity is January (92%).
The months with the lowest relative humidity are July and August (56%).
Average rainfall in December
Plain, WA
- Average rainfall in December: 3.86"
The wettest month (with the highest rainfall) is January (4.33").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in December
Plain, WA
- Average rainfall days in December: 13 days
The month with the highest number of rainy days is March (18.2 days).
The month with the least rainy days is August (6.3 days).
Average snowfall in December
Plain, WA
- Average snowfall in December: 15.28"
The month with the highest snowfall is January (16.73").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Plain, WA
- Average snowfall days in December: 17 days
The month with the highest number of snowfall days is December (17 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Plain, 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 2min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in December
Plain, WA
- Average sunshine days in December: 8.9 days
The month with the most sunshine days is August (21.9 days).
The month with the least sunshine days is February (6.8 days).
Average UV index in December
Plain, WA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and February (UV index 1).
Average cloud cover in December
Plain, WA
- Average cloud cover in December: 55
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in December
Plain, WA
- Average visibility in December: 4mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, November and December (4mi).
Plain, Washington, USA
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