December weather forecast
Walnut Grove, WA

Share

Weather in December

December, the first month of the winter in Walnut Grove, is still a chilly month, with an average temperature ranging between max 43.7°F (6.5°C) and min 34°F (1.1°C).

Temperature

December is the month when Walnut Grove sees the lowest average temperatures, with a high of 43.7°F (6.5°C) and a low of 34°F (1.1°C).

Humidity

In Walnut Grove, the average relative humidity in December is 83%.

Rainfall

The month with the most rainfall is December, when the rain falls for 19.6 days and typically aggregates up to 5.08" (129mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall in Walnut Grove. In Walnut Grove, during December, snow falls for 0.6 days and regularly aggregates up to 0.35" (9mm) of snow. Throughout the year, there are 5.9 snowfall days, and 3.74" (95mm) of snow is accumulated.

Daylight

With an average of 8h and 48min of daylight, December has the shortest days of the year in Walnut Grove, Washington.
On the first day of December, sunrise is at 7:31 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:50 am and sunset at 4:36 pm PST.

Sunshine

In Walnut Grove, the average sunshine in December is 4.2h.

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 reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum UV index, 2 during December, leads to the following recommendations:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Updated: Aug 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest?

December brings the lowest temperatures, with an average high of 43.7°F (6.5°C) and an average low of 34°F (1.1°C).

Is it cold during December?

In December, the average high-temperature and low-temperature in Walnut Grove are 43.7°F (6.5°C) and 34°F (1.1°C) respectively. The average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is calculated to be 82.4°F (28°C).

What is the average humidity in December?

The average relative humidity in December is 83%.

What is the rainiest month?

The month with the most rainfall is December, when the rain falls for 19.6 days and typically aggregates up to 5.08" (129mm) of precipitation.

How many days does it rain in December?

In Walnut Grove, in December, during 19.6 rainfall days, 5.08" (129mm) of precipitation is typically accumulated.

How much does it snow in December?

In Walnut Grove, in December, during 0.6 snowfall days, 0.35" (9mm) 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 48min of daylight.

What is the average length of the day in December?

In December, the average day length in Walnut Grove is 8h and 46min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:31 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:50 am and sunset at 4:36 pm PST.

How many hours of sunshine does Walnut Grove have in December?

The average sunshine duration in December is 4.2h.

What are the months with the lowest UV index?

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

What is the UV index reading in December?

The average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents 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
Walnut Grove, WA

Average temperature in December - Walnut Grove, WA
  • Average high temperature in December: 43.7°F

The warmest month (with the highest average high temperature) is August (80.6°F).
The month with the lowest average high temperature is December (43.7°F).

  • Average low temperature in December: 34°F

The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (34°F).

Average pressure in December
Walnut Grove, WA

Average pressure in December - Walnut Grove, WA
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

Average wind speed in December
Walnut Grove, WA

Average wind speed in December - Walnut Grove, WA
  • Average wind speed in December: 5.2mph

The windiest month (with the highest average wind speed) is January (5.5mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).

Average humidity in December
Walnut Grove, WA

Average humidity in December - Walnut Grove, WA
  • Average humidity in December: 83%

The months with the highest relative humidity are January and February (84%).
The month with the lowest relative humidity is August (65%).

Average rainfall in December
Walnut Grove, WA

Average rainfall in December - Walnut Grove, WA
  • Average rainfall in December: 5.08"

The wettest month (with the highest rainfall) is December (5.08").
The driest month (with the least rainfall) is July (0.35").

Average rainfall days in December
Walnut Grove, WA

Average rainfall days in December - Walnut Grove, WA
  • Average rainfall days in December: 19.6 days

The month with the highest number of rainy days is March (20.6 days).
The month with the least rainy days is August (4.9 days).

Average snowfall in December
Walnut Grove, WA

Average snowfall in December - Walnut Grove, WA
  • Average snowfall in December: 0.35"

The month with the highest snowfall is February (1.42").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Walnut Grove, WA

Average snowfall days in December - Walnut Grove, WA
  • Average snowfall days in December: 0.6 days

The month with the highest number of snowfall days is February (2.1 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
Walnut Grove, WA

Average daylight in December / Average sunshine in December - Walnut Grove, WA
  • Average daylight in December: 8h and 5min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in December: 4h and 1min

The month with the most sunshine is August (Average sunshine: 11h and 0min).
The months with the least sunshine are January and February (Average sunshine: 4h and 6min).

Average sunshine days in December
Walnut Grove, WA

Average sunshine days in December - Walnut Grove, WA
  • Average sunshine days in December: 9.9 days

The month with the most sunshine days is July (24.1 days).
The month with the least sunshine days is February (7.9 days).

Average UV index in December
Walnut Grove, WA

Average UV index in December - Walnut Grove, 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, February, November and December (UV index 2).

Average cloud cover in December
Walnut Grove, WA

Average cloud cover in December - Walnut Grove, WA
  • Average cloud cover in December: 56

The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 23).

Average visibility in December
Walnut Grove, WA

Average visibility in December - Walnut Grove, WA
  • Average visibility in December: 5mi

The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (5mi).

Walnut Grove, Washington, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location