December weather forecastPiedmont, WA
December
Weather in December
The first month of the winter, December, is also an icy month in Piedmont, Washington, with temperature in the range of an average high of 39.4°F (4.1°C) and an average low of 31.5°F (-0.3°C).Temperature
December, recording an average high temperature of 39.4°F (4.1°C) and a low temperature of 31.5°F (-0.3°C), is Piedmont's coldest month.Humidity
The months with the highest humidity 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. Throughout the year, there are 150.3 rainfall days, and 17.36" (441mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In Piedmont, in December, during 3.6 snowfall days, 0.94" (24mm) of snow is typically accumulated. Throughout the year, there are 20 snowfall days, and 11.06" (281mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 8h and 24min of daylight.On the first day of December, sunrise is at 7:45 am and sunset at 4:23 pm. On the last day of the month, sunrise is at 8:05 am and sunset at 4:31 pm PST.
Sunshine
In Piedmont, the average sunshine in December is 4.1h.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Piedmont. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, an average UV index of 2 transforms into the following instructions:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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 24min
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 6min
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).
