December weather forecast
Piedmont, WA

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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.
Updated: Aug 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest?

With average high and low temperatures of 39.4°F (4.1°C) and 31.5°F (-0.3°C) respectively, December is Piedmont's coldest month.

How cold is it in December?

An average high-temperature, in December, in Piedmont, is 39.4°F (4.1°C) and the average low-temperature is 31.5°F (-0.3°C).

What is the most humid month in Piedmont?

The months with the highest humidity in Piedmont are January and December, with an average relative humidity of 89%.

What is the average humidity in December?

The average relative humidity in December is 89%.

How many days does it rain in December?

In Piedmont, in December, during 15.3 rainfall days, 2.52" (64mm) of precipitation is typically accumulated.

How many days does it snow in December?

In Piedmont, in December, during 3.6 snowfall days, 0.94" (24mm) of snow is typically accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 8h and 24min of daylight.

How many hours of daylight does Piedmont have in December?

In Piedmont, the average day length in December is 8h and 26min.

What time are sunrise and sunset in December?

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.

How long on average sun shines in December?

In Piedmont, the average sunshine duration in December is 4.1h.

When is the lowest UV index?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index reading in December?

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Piedmont, WA

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / 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 - 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 - 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 - 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 - 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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