December weather forecast
Plain, WA

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Weather in December

The first month of the winter, December, is also a subzero cold month in Plain, Washington, with an average temperature fluctuating between 18.7°F (-7.4°C) and 30.6°F (-0.8°C).

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.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month in Plain?

Plain records the coldest temperatures in December, averaging a high of 30.6°F (-0.8°C) and a low of 18.7°F (-7.4°C).

How cold is December in Plain?

An average high-temperature, in December, in Plain, is 30.6°F (-0.8°C) and the average low-temperature is 18.7°F (-7.4°C).

What is the average humidity in December in Plain?

The average relative humidity in December is 90%.

How much does it rain in Plain in December?

In December, in Plain, the rain falls for 13 days. Throughout December, 3.86" (98mm) of precipitation is accumulated.

How many days does it snow in December in Plain?

In Plain, in December, during 17 snowfall days, 15.28" (388mm) of snow is typically accumulated.

What is the month with the shortest days in Plain?

December has the shortest days of the year in Plain, Washington, with an average of 8h and 30min of daylight.

What is the average length of the day in December in Plain?

In December, the average day length is 8h and 29min.

When is the sunrise / sunset in December in Plain?

In December, on the first day of the month, sunrise is at 7:31 am and sunset at 4:12 pm. On the last day of the month, in Plain, sunrise is at 7:51 am and sunset at 4:20 pm PST.

How many hours of sunshine does Plain have in December?

In December, the average sunshine duration in Plain, Washington, is 4.4h.

How high is the UV index in December in Plain?

In Plain, Washington, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to Sun's UV rays.
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
Plain, WA

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