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 lowest temperatures are recorded in December, with averages reaching a high of 39.4°F (4.1°C) and a low of 31.5°F (-0.3°C).Humidity
The months with the highest humidity in Piedmont are January and December, with an average relative humidity of 89%.Rainfall
In Piedmont, in December, it is raining for 15.3 days, with typically 2.52" (64mm) of accumulated precipitation. In Piedmont, Washington, during the entire year, the rain falls for 150.3 days and collects up to 17.36" (441mm) of precipitation.Snowfall
Months with snowfall in Piedmont are January through April, November and December. In December, it is snowing for 3.6 days. Throughout December, 0.94" (24mm) of snow is accumulated. Throughout the year, in Piedmont, Washington, there are 20 snowfall days, and 11.06" (281mm) of snow is accumulated.Daylight
December has the shortest days of the year in Piedmont, with an average of 8h and 24min of daylight.On the first day of the month, sunrise is at 7:45 am and sunset at 4:23 pm. On the last day of December, in Piedmont, sunrise is at 8:05 am and sunset at 4:31 pm PST.
Sunshine
The average sunshine in December is 4.1h.UV index
The months with the lowest UV index in Piedmont are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: In December, the maximum UV index of 2 suggests this advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Frequently asked questions
What time of the year is the coldest in Piedmont?
Is it cold in Piedmont during December?
What are the most humid months in Piedmont?
What is the average humidity in December in Piedmont?
How much does it rain in Piedmont in December?
How much does it snow in Piedmont in December?
What is the month with the shortest days in Piedmont?
What is the average length of the day in December in Piedmont?
What time are sunrise and sunset in December in Piedmont?
How long on average sun shines in December in Piedmont?
What are the months with the lowest UV index in Piedmont?
What is the UV index reading in December in Piedmont?
Average temperature in December
Piedmont, WA
- Average high temperature in December: 39.4°F
The warmest month (with the highest average high temperature) is August (69.1°F).
The month with the lowest average high temperature is December (39.4°F).
- Average low temperature in December: 31.5°F
The month with the highest average low temperature is August (48.6°F).
The coldest months (with the lowest average low temperature) are February and December (31.5°F).
Average pressure in December
Piedmont, WA
- Average pressure in December: 30.04"Hg
The month with the highest atmospheric pressure is July (30.07"Hg).
The month with the lowest atmospheric pressure is March (29.99"Hg).
Average wind speed in December
Piedmont, WA
- Average wind speed in December: 4.8mph
The windiest months (with the highest average wind speed) are January and November (5.2mph).
The calmest months (with the lowest average wind speed) are August and September (3.5mph).
Average humidity in December
Piedmont, WA
- Average humidity in December: 89%
The months with the highest relative humidity are January and December (89%).
The months with the lowest relative humidity are July and August (76%).
Average rainfall in December
Piedmont, WA
- Average rainfall in December: 2.52"
The wettest month (with the highest rainfall) is January (3.35").
The driest months (with the least rainfall) are July and August (0.43").
Average rainfall days in December
Piedmont, WA
- Average rainfall days in December: 15.3 days
The month with the highest number of rainy days is March (16.1 days).
The month with the least rainy days is August (5.4 days).
Average snowfall in December
Piedmont, WA
- Average snowfall in December: 0.94"
The month with the highest snowfall is February (4.53").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Piedmont, WA
- Average snowfall days in December: 3.6 days
The month with the highest number of snowfall days is February (7.2 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
Piedmont, 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: 4h and 1min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in December
Piedmont, WA
- Average sunshine days in December: 12.8 days
The month with the most sunshine days is August (22.5 days).
The month with the least sunshine days is February (9.6 days).
Average UV index in December
Piedmont, WA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Piedmont, WA
- Average cloud cover in December: 59
The month with the most cloud cover is February (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in December
Piedmont, WA
- Average visibility in December: 4mi
The months with the highest visibility are April, May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February, March and December (4mi).
Piedmont, Washington, USA
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