December weather forecast
Flagstaff, AZ

The brown iconic clock tower in the city of Flagstaff, Arizona, with the street signs of Birch Avenue and San Francisco Street
The brown iconic clock tower in the city of Flagstaff, Arizona, with the street signs of Birch Avenue and San Francisco Street

Weather in December

The first month of the winter, December, is also a wintry month in Flagstaff, Arizona, with temperature in the range of an average high of 42.6°F (5.9°C) and an average low of 24.8°F (-4°C).

Temperature

The coldest months are January and December, with an average high-temperature of 42.6°F (5.9°C).

Humidity

In December, the average relative humidity in Flagstaff is 64%.

Rainfall

In Flagstaff, during December, the rain falls for 3.6 days and regularly aggregates up to 1.1" (28mm) of precipitation. Throughout the year, in Flagstaff, there are 74.8 rainfall days, and 12.56" (319mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. December is the month with the most snowfall in Flagstaff. Snow falls for 7.4 days and accumulates 7.36" (187mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 50min of daylight.
On the first day of December in Flagstaff, sunrise is at 7:16 am and sunset at 5:14 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 5:24 pm MST.

Sunshine

The month with the least sunshine is December, with an average of 6.8h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 2 in December transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Flagstaff?

January and December, with an average high-temperature of 42.6°F (5.9°C), are the coldest months.

What is the average humidity in December in Flagstaff?

In December, the average relative humidity is 64%.

How many days does it rain in December in Flagstaff?

In Flagstaff, Arizona, in December, during 3.6 rainfall days, 1.1" (28mm) of precipitation is typically accumulated.

What is the snowiest month in Flagstaff?

The month with the most snowfall in Flagstaff, Arizona, is December, when snow falls for 7.4 days and typically aggregates up to 7.36" (187mm) of snow.

How many days does it snow in December in Flagstaff?

In Flagstaff, Arizona, in December, snow falls for 7.4 days, with typically accumulated 7.36" (187mm) of snow.

What is the month with the shortest days in Flagstaff?

With an average of 9h and 50min of daylight, December has the shortest days of the year in Flagstaff.

How many hours of daylight does Flagstaff have in December?

In Flagstaff, Arizona, the average day length in December is 9h and 50min.

When is the sunrise / sunset in December in Flagstaff?

On the first day of December in Flagstaff, sunrise is at 7:16 am and sunset at 5:14 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 5:24 pm MST.

What is the month with the least sunshine in Flagstaff?

With an average of 6.8h of sunshine, December has the least sunshine of the year in Flagstaff, Arizona.

How many hours of sunshine does Flagstaff have in December?

In Flagstaff, the average sunshine duration in December is 6.8h.

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

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

What is the UV index reading in December in Flagstaff?

The average daily maximum UV index in December in Flagstaff, Arizona, is 2. A UV Index estimate of 2, and below, represents a low health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Flagstaff, AZ

Average temperature in December - Flagstaff, AZ
  • Average high temperature in December: 42.6°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The months with the lowest average high temperature are January and December (42.6°F).

  • Average low temperature in December: 24.8°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is December (24.8°F).

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Average pressure in December
Flagstaff, AZ

Average pressure in December - Flagstaff, AZ
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).

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Average wind speed in December
Flagstaff, AZ

Average wind speed in December - Flagstaff, AZ
  • Average wind speed in December: 6.9mph

The windiest month (with the highest average wind speed) is April (9.6mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).

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Average humidity in December
Flagstaff, AZ

Average humidity in December - Flagstaff, AZ
  • Average humidity in December: 64%

The month with the highest relative humidity is January (66%).
The month with the lowest relative humidity is June (24%).

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Average rainfall in December
Flagstaff, AZ

Average rainfall in December - Flagstaff, AZ
  • Average rainfall in December: 1.1"

The wettest month (with the highest rainfall) is July (2.56").
The driest month (with the least rainfall) is June (0.24").

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Average rainfall days in December
Flagstaff, AZ

Average rainfall days in December - Flagstaff, AZ
  • Average rainfall days in December: 3.6 days

The month with the highest number of rainy days is July (16.2 days).
The months with the least rainy days are February and November (2.5 days).

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Average snowfall in December
Flagstaff, AZ

Average snowfall in December - Flagstaff, AZ
  • Average snowfall in December: 7.36"

The month with the highest snowfall is December (7.36").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Flagstaff, AZ

Average snowfall days in December - Flagstaff, AZ
  • Average snowfall days in December: 7.4 days

The month with the highest number of snowfall days is December (7.4 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in December /
Average sunshine in December
Flagstaff, AZ

Average daylight in December / Average sunshine in December - Flagstaff, AZ
  • Average daylight in December: 9h and 50min

The month with the longest days is June (Average daylight: 14h and 29min).
The month with the shortest days is December (Average daylight: 9h and 50min).

  • Average sunshine in December: 6h and 48min

The months with the most sunshine are June and August (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).

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Average sunshine days in December
Flagstaff, AZ

Average sunshine days in December - Flagstaff, AZ
  • Average sunshine days in December: 22.4 days

The month with the most sunshine days is June (25.8 days).
The month with the least sunshine days is July (11.4 days).

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Average UV index in December
Flagstaff, AZ

Average UV index in December - Flagstaff, 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
Flagstaff, AZ

Average cloud cover in December - Flagstaff, AZ
  • Average cloud cover in December: 24

The month with the most cloud cover is December (Cloud cover 24).
The month with the least cloud cover is June (Cloud cover 7).

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Average visibility in December
Flagstaff, AZ

Average visibility in December - Flagstaff, AZ
  • 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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