December weather forecast
Morton, WA

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Weather in December

The first month of the winter, December, is also a wintry month in Morton, Washington, with temperature in the range of an average high of 41.2°F (5.1°C) and an average low of 30.7°F (-0.7°C).

Temperature

December is the coldest month, with an average high-temperature of 41.2°F (5.1°C) and an average low-temperature of 30.7°F (-0.7°C).

Humidity

In December, the average relative humidity is 87%.

Rainfall

In Morton, in December, it is raining for 17.5 days, with typically 5.83" (148mm) of accumulated precipitation. Throughout the year, in Morton, Washington, there are 178.8 rainfall days, and 40.47" (1028mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall. In December, it is snowing for 3.5 days. Throughout December, 1.77" (45mm) of snow is accumulated. Throughout the year, there are 20 snowfall days, and 17.24" (438mm) of snow is accumulated.

Daylight

The month with the shortest days in Morton is December, with an average of 8h and 36min of daylight.
On the first day of December in Morton, sunrise is at 7:33 am and sunset at 4:23 pm. On the last day of the month, sunrise is at 7:53 am and sunset at 4:31 pm PST.

Sunshine

In December, the average sunshine in Morton is 3.9h.

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 the ordinary person.
Note: In December, the average maximum UV index of 2 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. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
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Frequently asked questions

What are the coldest months in Morton?

December, on average, is the coldest month, registering a high temperature of 41.2°F (5.1°C) and a low of 30.7°F (-0.7°C).

Is it cold in Morton during December?

The high-temperature, in December, in Morton, is 41.2°F (5.1°C), while the low-temperature averages to 30.7°F (-0.7°C).

What is the average humidity in December in Morton?

In December, the average relative humidity in Morton, Washington, is 87%.

How many days does it rain in December in Morton?

In Morton, during December, the rain falls for 17.5 days and regularly aggregates up to 5.83" (148mm) of precipitation.

How many days does it snow in December in Morton?

In Morton, Washington, in December, snow falls for 3.5 days, with typically accumulated 1.77" (45mm) of snow.

What is the month with the shortest days in Morton?

December has the shortest days of the year in Morton, Washington, with an average of 8h and 36min of daylight.

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

In Morton, the average day length in December is 8h and 38min.

When is the sunrise / sunset in December in Morton?

On the first day of December in Morton, Washington, sunrise is at 7:33 am and sunset at 4:23 pm. On the last day of the month, sunrise is at 7:53 am and sunset at 4:31 pm PST.

How many hours of sunshine does Morton have in December?

The average sunshine duration in December in Morton, Washington, is 3.9h.

What is the UV index reading in December in Morton?

In December, the average daily maximum UV index in Morton is 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's 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
Morton, WA

Average temperature in December - Morton, WA
  • Average high temperature in December: 41.2°F

The warmest month (with the highest average high temperature) is August (75.9°F).
The month with the lowest average high temperature is December (41.2°F).

  • Average low temperature in December: 30.7°F

The month with the highest average low temperature is August (47.3°F).
The coldest month (with the lowest average low temperature) is December (30.7°F).

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Average pressure in December
Morton, WA

Average pressure in December - Morton, WA
  • Average pressure in December: 30.09"Hg

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

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Average wind speed in December
Morton, WA

Average wind speed in December - Morton, WA
  • Average wind speed in December: 5mph

The windiest month (with the highest average wind speed) is January (5.3mph).
The calmest month (with the lowest average wind speed) is August (3.6mph).

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Average humidity in December
Morton, WA

Average humidity in December - Morton, WA
  • Average humidity in December: 87%

The month with the highest relative humidity is February (88%).
The month with the lowest relative humidity is July (71%).

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Average rainfall in December
Morton, WA

Average rainfall in December - Morton, WA
  • Average rainfall in December: 5.83"

The wettest month (with the highest rainfall) is January (6.46").
The driest month (with the least rainfall) is July (0.43").

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Average rainfall days in December
Morton, WA

Average rainfall days in December - Morton, WA
  • Average rainfall days in December: 17.5 days

The month with the highest number of rainy days is March (20.3 days).
The month with the least rainy days is July (6.3 days).

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Average snowfall in December
Morton, WA

Average snowfall in December - Morton, WA
  • Average snowfall in December: 1.77"

The month with the highest snowfall is January (5.51").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Morton, WA

Average snowfall days in December - Morton, WA
  • Average snowfall days in December: 3.5 days

The month with the highest number of snowfall days is February (6 days).
The months with the least snowfall days are June, July, August and October (0 days).

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

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

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

  • Average sunshine in December: 3h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are January and February (Average sunshine: 3h and 48min).

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Average sunshine days in December
Morton, WA

Average sunshine days in December - Morton, 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 February (8.2 days).

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Average UV index in December
Morton, WA

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

The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is November (UV index 1).

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Average cloud cover in December
Morton, WA

Average cloud cover in December - Morton, WA
  • Average cloud cover in December: 60

The month with the most cloud cover is March (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 30).

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Average visibility in December
Morton, WA

Average visibility in December - Morton, WA
  • Average visibility in December: 4mi

The months with the highest visibility are July, August and September (5mi).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (4mi).

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Morton, Washington, USA

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