December weather forecast
Window Rock, AZ

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Weather in December

The first month of the winter, December, is also an icy month in Window Rock, Arizona, with an average temperature varying between 23.4°F (-4.8°C) and 39.7°F (4.3°C).

Temperature

In December, the average high-temperature decreases from a cool 51.1°F (10.6°C) in November to a cold 39.7°F (4.3°C). Window Rock records an average low of 23.4°F (-4.8°C) throughout the nights in December.

Humidity

In December, the average relative humidity in Window Rock is 66%.

Rainfall

In Window Rock, in December, it is raining for 4 days, with typically 1.06" (27mm) of accumulated precipitation. In Window Rock, Arizona, during the entire year, the rain falls for 90.1 days and collects up to 11.93" (303mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. December is the month with the most snowfall in Window Rock. Snow falls for 8.5 days and accumulates 5.55" (141mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 48min of daylight.
On the first day of December, sunrise is at 7:08 am and sunset at 5:02 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 5:13 pm MST.

Sunshine

The months with the least sunshine are January and December, with an average of 6.4h of sunshine.

UV index

The months with the lowest UV index in Window Rock 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 radiation for the ordinary person.
Note: The maximum UV index of 2 during December leads to these instructions:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
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Frequently asked questions

How cold is December in Window Rock?

The average high-temperature, in December, in Window Rock, is 39.7°F (4.3°C), while the average low-temperature is 23.4°F (-4.8°C). In July, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, is evaluated at 82.4°F (28°C).

What is the average humidity in December in Window Rock?

In Window Rock, Arizona, the average relative humidity in December is 66%.

How much does it rain in Window Rock in December?

In Window Rock, in December, it is raining for 4 days, with typically 1.06" (27mm) of accumulated precipitation.

What is the snowiest month in Window Rock?

The month with the most snowfall in Window Rock, Arizona, is December, when snow falls for 8.5 days and typically aggregates up to 5.55" (141mm) of snow.

How many days does it snow in December in Window Rock?

In Window Rock, in December, snow falls for 8.5 days, with typically accumulated 5.55" (141mm) of snow.

What is the month with the shortest days in Window Rock?

With an average of 9h and 48min of daylight, December has the shortest days of the year in Window Rock.

What is the average length of the day in December in Window Rock?

In Window Rock, the average day length in December is 9h and 47min.

When are sunrise and sunset in December in Window Rock?

In December, on the first day of the month, sunrise is at 7:08 am and sunset at 5:02 pm. On the last day of the month, in Window Rock, Arizona, sunrise is at 7:25 am and sunset at 5:13 pm MST.

What is the month with the least sunshine in Window Rock?

January and December, with an average of 6.4h of sunshine, are months with the least sunshine in Window Rock.

How many hours of sunshine does Window Rock have in December?

In December, the average sunshine duration in Window Rock is 6.4h.

What are the months with the lowest UV index in Window Rock?

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

How high is the UV index in December in Window Rock?

In December, the average daily maximum UV index in Window Rock is 2. A UV Index estimate 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
Window Rock, AZ

Average temperature in December - Window Rock, AZ
  • Average high temperature in December: 39.7°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (38.5°F).

  • Average low temperature in December: 23.4°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

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Average pressure in December
Window Rock, AZ

Average pressure in December - Window Rock, AZ
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

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Average wind speed in December
Window Rock, AZ

Average wind speed in December - Window Rock, AZ
  • Average wind speed in December: 7.5mph

The windiest month (with the highest average wind speed) is April (11.4mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).

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Average humidity in December
Window Rock, AZ

Average humidity in December - Window Rock, AZ
  • Average humidity in December: 66%

The month with the highest relative humidity is January (70%).
The month with the lowest relative humidity is June (23%).

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Average rainfall in December
Window Rock, AZ

Average rainfall in December - Window Rock, AZ
  • Average rainfall in December: 1.06"

The wettest month (with the highest rainfall) is July (2.44").
The driest month (with the least rainfall) is June (0.35").

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Average rainfall days in December
Window Rock, AZ

Average rainfall days in December - Window Rock, AZ
  • Average rainfall days in December: 4 days

The month with the highest number of rainy days is July (19.2 days).
The month with the least rainy days is February (2.9 days).

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Average snowfall in December
Window Rock, AZ

Average snowfall in December - Window Rock, AZ
  • Average snowfall in December: 5.55"

The month with the highest snowfall is December (5.55").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Window Rock, AZ

Average snowfall days in December - Window Rock, AZ
  • Average snowfall days in December: 8.5 days

The month with the highest number of snowfall days is December (8.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Window Rock, AZ

Average daylight in December / Average sunshine in December - Window Rock, AZ
  • Average daylight in December: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in December: 6h and 2min

The month with the most sunshine is June (Average sunshine: 11h and 48min).
The months with the least sunshine are January and December (Average sunshine: 6h and 24min).

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Average sunshine days in December
Window Rock, AZ

Average sunshine days in December - Window Rock, AZ
  • Average sunshine days in December: 19.8 days

The month with the most sunshine days is November (23.7 days).
The month with the least sunshine days is July (8.3 days).

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Average UV index in December
Window Rock, AZ

Average UV index in December - Window Rock, AZ
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
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
Window Rock, AZ

Average cloud cover in December - Window Rock, AZ
  • Average cloud cover in December: 28

The month with the most cloud cover is January (Cloud cover 29).
The month with the least cloud cover is June (Cloud cover 10).

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Average visibility in December
Window Rock, AZ

Average visibility in December - Window Rock, AZ
  • Average visibility in December: 6mi

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

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Window Rock, Arizona, USA

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