December weather forecast
Wallula, WA

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Weather in December

The first month of the winter, December, is also a wintry month in Wallula, Washington, with temperature in the range of an average high of 38.3°F (3.5°C) and an average low of 27.9°F (-2.3°C).

Temperature

December, recording an average high temperature of 38.3°F (3.5°C) and a low temperature of 27.9°F (-2.3°C), is Wallula's coldest month.

Humidity

The average relative humidity in December is 78%.

Rainfall

The months with the most rainfall in Wallula, Washington, are March and December, with an average 0.94" (24mm) of precipitation.

Snowfall

Months with snowfall are January through March, November and December. In December, it is snowing for 3.1 days. Throughout December, 1.57" (40mm) of snow is accumulated. Throughout the year, in Wallula, there are 9.7 snowfall days, and 5.2" (132mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 8h and 42min of daylight.
On the first day of the month, sunrise is at 7:18 am and sunset at 4:11 pm. On the last day of December, in Wallula, sunrise is at 7:37 am and sunset at 4:20 pm PST.

Sunshine

In December, the average sunshine in Wallula is 5.5h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the average person.
Note: During December, 2 as the daily maximum UV index converts into the following advice:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Updated: Feb 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the coldest in Wallula?

The month of December, characterized by an average high of 38.3°F (3.5°C) and a low of 27.9°F (-2.3°C), is recognized as the coldest in Wallula.

Is it cold in Wallula during December?

During December, Wallula experiences an average high-temperature of 38.3°F (3.5°C) and a low-temperature of 27.9°F (-2.3°C).

What is the average humidity in December in Wallula?

In December, the average relative humidity in Wallula, Washington, is 78%.

What is the wettest month in Wallula?

The months with the most rainfall are March and December, with an average 0.94" (24mm) of precipitation.

How many days does it rain in December in Wallula?

In Wallula, during December, the rain falls for 11.5 days and regularly aggregates up to 0.94" (24mm) of precipitation.

How much does it snow in Wallula in December?

In Wallula, in December, during 3.1 snowfall days, 1.57" (40mm) of snow is typically accumulated.

What is the month with the shortest days in Wallula?

December has the shortest days of the year, with an average of 8h and 42min of daylight.

How many hours of daylight does Wallula have in December?

In Wallula, Washington, the average day length in December is 8h and 42min.

What time are sunrise and sunset in December in Wallula?

In December, on the first day of the month, sunrise is at 7:18 am and sunset at 4:11 pm. On the last day of the month, in Wallula, Washington, sunrise is at 7:37 am and sunset at 4:20 pm PST.

How long on average sun shines in December in Wallula?

In December, the average sunshine duration in Wallula is 5.5h.

What is the month with the lowest UV index in Wallula?

January, February, 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 in Wallula?

The average daily maximum UV index in December in Wallula, Washington, is 2. A UV Index of 2, and less, symbolizes a low health threat 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
Wallula, WA

Average temperature in December - Wallula, WA
  • Average high temperature in December: 38.3°F

The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is December (38.3°F).

  • Average low temperature in December: 27.9°F

The month with the highest average low temperature is August (64°F).
The coldest month (with the lowest average low temperature) is December (27.9°F).

Average pressure in December
Wallula, WA

Average pressure in December - Wallula, WA
  • Average pressure in December: 30.16"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).

Average wind speed in December
Wallula, WA

Average wind speed in December - Wallula, WA
  • Average wind speed in December: 5.8mph

The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is December (5.8mph).

Average humidity in December
Wallula, WA

Average humidity in December - Wallula, WA
  • Average humidity in December: 78%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is July (35%).

Average rainfall in December
Wallula, WA

Average rainfall in December - Wallula, WA
  • Average rainfall in December: 0.94"

The wettest months (with the highest rainfall) are March and December (0.94").
The driest month (with the least rainfall) is July (0.2").

Average rainfall days in December
Wallula, WA

Average rainfall days in December - Wallula, WA
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is March (13.3 days).
The month with the least rainy days is July (3.5 days).

Average snowfall in December
Wallula, WA

Average snowfall in December - Wallula, WA
  • Average snowfall in December: 1.57"

The month with the highest snowfall is February (2.2").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Wallula, WA

Average snowfall days in December - Wallula, WA
  • Average snowfall days in December: 3.1 days

The month with the highest number of snowfall days is December (3.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Wallula, WA

Average daylight in December / Average sunshine in December - Wallula, WA
  • Average daylight in December: 8h and 4min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in December: 5h and 3min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).

Average sunshine days in December
Wallula, WA

Average sunshine days in December - Wallula, WA
  • Average sunshine days in December: 16 days

The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is March (15.4 days).

Average UV index in December
Wallula, WA

Average UV index in December - Wallula, WA
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Wallula, WA

Average cloud cover in December - Wallula, WA
  • Average cloud cover in December: 43

The month with the most cloud cover is January (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 9).

Average visibility in December
Wallula, WA

Average visibility in December - Wallula, WA
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Wallula, Washington, USA

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