December weather forecast and climate
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 still a cold month in Flagstaff, Arizona, with average temperature varying between 24.8°F (-4°C) and 42.6°F (5.9°C).

Temperature

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

Humidity

In Flagstaff, the average relative humidity is 64%.

Rainfall

In Flagstaff, during December, the rain falls for 3.6 days and regularly aggregates up to 1.1" (28mm) of precipitation. In Flagstaff, during the entire year, the rain falls for 74.8 days and collects up to 12.56" (319mm) of precipitation.

Snowfall

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

Daylight

The month with the shortest days in Flagstaff is December, with an average of 9.8h of daylight.

Sunshine

December has the least sunshine of the year, 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 the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 2 interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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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 in Flagstaff, Arizona.

What is the temperature in December in Flagstaff?

In Flagstaff, in December, the average high-temperature is 42.6°F (5.9°C), and the average low-temperature is 24.8°F (-4°C).

What is the average humidity in December in Flagstaff?

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

How many days does it rain in December in Flagstaff?

In Flagstaff, during December, the rain falls for 3.6 days and regularly aggregates up to 1.1" (28mm) of precipitation.

How much does it snow in Flagstaff in December?

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

What is the snowiest month in Flagstaff?

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

What is the month with the shortest days in Flagstaff?

The month with the shortest days is December, with an average of 9.8h of daylight.

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

In December, the average length of the day in Flagstaff, Arizona, is 9.8h.

What is the month with the least sunshine in Flagstaff?

December has the least sunshine of the year, with an average of 6.8h of sunshine.

How many hours of sunshine does Flagstaff have in December?

The average sunshine in December in Flagstaff is 6.8h.

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

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

How high is the UV index in December in Flagstaff?

The average daily maximum UV index in December in Flagstaff is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from the exposure to the Sun's UV rays.

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).
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"

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

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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).
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").
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).
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: 9.8h

The month with the longest days is June (Average daylight: 14.5h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in December: 6.8h

Months with the most sunshine are June and August (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 6.8h).

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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

Months with the highest UV index are June, July and August (UV index 6).
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

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

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