December weather forecast
Custer, WA

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Weather in December

The first month of the winter, December, is also a wintry month in Custer, Washington, with temperature in the range of an average high of 41.9°F (5.5°C) and an average low of 36°F (2.2°C).

Temperature

December, recording an average high temperature of 41.9°F (5.5°C) and a low temperature of 36°F (2.2°C), is Custer's coldest month.

Humidity

The average relative humidity in December in Custer, Washington, is 82%.

Rainfall

In Custer, in December, during 18.2 rainfall days, 6.34" (161mm) of precipitation is typically accumulated. Throughout the year, there are 176.1 rainfall days, and 43.78" (1112mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Custer are January through April, November and December. In Custer, during December, snow falls for 2 days and regularly aggregates up to 1.54" (39mm) of snow. Throughout the year, in Custer, there are 10.5 snowfall days, and 6.77" (172mm) of snow is accumulated.

Daylight

The month with the shortest days in Custer is December, with an average of 8h and 18min of daylight.
On the first day of the month, sunrise is at 7:43 am and sunset at 4:15 pm. On the last day of December, in Custer, sunrise is at 8:04 am and sunset at 4:23 pm PST.

Sunshine

January and December, with an average of 3.9h of sunshine, are months with the least sunshine.

UV index

The months with the lowest UV index in Custer are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for average individuals.
Note: A maximum high UV index of 2 in December translates into the following recommendations:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
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Frequently asked questions

What time of the year is the coldest in Custer?

In Custer, December records the average lowest temperatures, peaking at 41.9°F (5.5°C) and reaching a low of 36°F (2.2°C).

How cold is December in Custer?

The high-temperature, in December, in Custer, is 41.9°F (5.5°C), while the low-temperature averages to 36°F (2.2°C).

What is the average humidity in December in Custer?

In December, the average relative humidity in Custer, Washington, is 82%.

How much does it rain in Custer in December?

In Custer, Washington, in December, during 18.2 rainfall days, 6.34" (161mm) of precipitation is typically accumulated.

How much does it snow in Custer in December?

In Custer, in December, snow falls for 2 days, with typically accumulated 1.54" (39mm) of snow.

What is the month with the shortest days in Custer?

The month with the shortest days is December, with an average of 8h and 18min of daylight.

How many hours of daylight does Custer have in December?

The average day length in December in Custer is 8h and 19min.

What time are sunrise and sunset in December in Custer?

On the first day of December in Custer, sunrise is at 7:43 am and sunset at 4:15 pm. On the last day of the month, sunrise is at 8:04 am and sunset at 4:23 pm PST.

What are the months with the least sunshine in Custer?

January and December, with an average of 3.9h of sunshine, are months with the least sunshine in Custer.

How long on average sun shines in December in Custer?

In Custer, the average sunshine duration in December is 3.9h.

What are the months with the lowest UV index in Custer?

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

What is the UV index intensity in December in Custer?

In December, the average daily maximum UV index in Custer, Washington, is 2. A UV Index value 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
Custer, WA

Average temperature in December - Custer, WA
  • Average high temperature in December: 41.9°F

The warmest month (with the highest average high temperature) is August (70°F).
The month with the lowest average high temperature is December (41.9°F).

  • Average low temperature in December: 36°F

The month with the highest average low temperature is August (54.9°F).
The coldest month (with the lowest average low temperature) is February (35.8°F).

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Average pressure in December
Custer, WA

Average pressure in December - Custer, WA
  • Average pressure in December: 30.06"Hg

The month with the highest atmospheric pressure is January (30.07"Hg).
The month with the lowest atmospheric pressure is March (30"Hg).

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Average wind speed in December
Custer, WA

Average wind speed in December - Custer, WA
  • Average wind speed in December: 6.3mph

The windiest months (with the highest average wind speed) are November and December (6.3mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).

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Average humidity in December
Custer, WA

Average humidity in December - Custer, WA
  • Average humidity in December: 82%

The months with the highest relative humidity are January and November (83%).
The month with the lowest relative humidity is July (74%).

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Average rainfall in December
Custer, WA

Average rainfall in December - Custer, WA
  • Average rainfall in December: 6.34"

The wettest month (with the highest rainfall) is November (7.13").
The driest month (with the least rainfall) is July (0.67").

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Average rainfall days in December
Custer, WA

Average rainfall days in December - Custer, WA
  • Average rainfall days in December: 18.2 days

The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (6.1 days).

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Average snowfall in December
Custer, WA

Average snowfall in December - Custer, WA
  • Average snowfall in December: 1.54"

The month with the highest snowfall is February (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Custer, WA

Average snowfall days in December - Custer, WA
  • Average snowfall days in December: 2 days

The month with the highest number of snowfall days is February (3.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Custer, WA
  • Average daylight in December: 8h and 2min

The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).

  • Average sunshine in December: 3h and 5min

The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The months with the least sunshine are January and December (Average sunshine: 3h and 54min).

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Average sunshine days in December
Custer, WA

Average sunshine days in December - Custer, WA
  • Average sunshine days in December: 10.5 days

The month with the most sunshine days is August (23.2 days).
The month with the least sunshine days is November (8.8 days).

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Average UV index in December
Custer, WA

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

The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
Custer, WA

Average cloud cover in December - Custer, WA
  • Average cloud cover in December: 58

The months with the most cloud cover are January and December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 26).

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Average visibility in December
Custer, WA

Average visibility in December - Custer, 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).

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Custer, Washington, USA

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