December weather forecast
Phoenix, AZ

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The city of Phoenix, Arizona at dusk
The city of Phoenix, Arizona at dusk

Weather in December

December in Phoenix rounds off the year under the gentle glow of winter sun. As the city greets the last month of the year, a soothing chill fills the air. Average high temperatures drop even further to a bearable 63°F (17.2°C), confirming the onset of winter. The city transforms into a winter wonderland with holiday decorations embellishing every corner. Despite the abundant sunshine and blue skies, the chilly touch of winter is unmistakeable in Phoenix this month.

Temperature

In Phoenix, the lowest average temperatures are observed in December, with a high of 63°F (17.2°C) and a low of 47.8°F (8.8°C).

Humidity

With an average relative humidity of 43%, December is the most humid month in Phoenix.

Rainfall

In Phoenix, in December, during 5 rainfall days, 0.59" (15mm) of precipitation is typically accumulated. Throughout the year, in Phoenix, there are 44.6 rainfall days, and 5.04" (128mm) of precipitation is accumulated.

Snowfall

In Phoenix, snow does not fall in January through August, October through December.

Daylight

December has the shortest days of the year, with an average of 10h and 0min of daylight.
On the first day of December in Phoenix, sunrise is at 7:14 am and sunset at 5:20 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 5:31 pm MST.

Sunshine

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

UV index

December is the month with the lowest UV index, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: During December, 3 as the daily maximum UV index converts into the following advice:
Exercise prevention - Precautions against solar damage are endorsed. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
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Frequently asked questions

What month is the coldest in Phoenix?

December stands out as Phoenix's coldest month, with an average high-temperature of 63°F (17.2°C) and a low-temperature of 47.8°F (8.8°C).

What is the average December temperature in Phoenix?

The high-temperature in Phoenix, Arizona, during December is 63°F (17.2°C) and the low-temperature is 47.8°F (8.8°C).

What is the most humid month in Phoenix?

The most humid month in Phoenix is December, with an average relative humidity of 43%.

What is the average humidity in December in Phoenix?

The average relative humidity in December in Phoenix is 43%.

How much does it rain in Phoenix in December?

In Phoenix, in December, during 5 rainfall days, 0.59" (15mm) of precipitation is typically accumulated.

When it does not snow in Phoenix?

In Phoenix, snow does not fall in January through August, October through December.

What is the month with the shortest days in Phoenix?

The month with the shortest days is December, with an average of 10h and 0min of daylight.

How many hours of daylight does Phoenix have in December?

The average day length in December in Phoenix is 9h and 59min.

When is the sunrise / sunset in December in Phoenix?

In December, on the first day of the month, sunrise is at 7:14 am and sunset at 5:20 pm. On the last day of the month, in Phoenix, Arizona, sunrise is at 7:32 am and sunset at 5:31 pm MST.

What is the month with the least sunshine in Phoenix?

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

How many hours of sunshine does Phoenix have in December?

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

When is the lowest UV index in Phoenix?

With an average maximum UV index of 3, December is the month with the lowest UV index in Phoenix.

How high is the UV index in December in Phoenix?

In Phoenix, the average daily maximum UV index in December is 3. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Phoenix, AZ

Average temperature in December - Phoenix, AZ
  • Average high temperature in December: 63°F

The warmest month (with the highest average high temperature) is July (103.6°F).
The month with the lowest average high temperature is December (63°F).

  • Average low temperature in December: 47.8°F

The month with the highest average low temperature is August (84.7°F).
The coldest month (with the lowest average low temperature) is January (47.5°F).

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Average pressure in December
Phoenix, AZ

Average pressure in December - Phoenix, AZ
  • Average pressure in December: 30.06"Hg

The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.81"Hg).

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Average wind speed in December
Phoenix, AZ

Average wind speed in December - Phoenix, AZ
  • Average wind speed in December: 4.3mph

The windiest month (with the highest average wind speed) is April (6.4mph).
The calmest month (with the lowest average wind speed) is December (4.3mph).

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Average humidity in December
Phoenix, AZ

Average humidity in December - Phoenix, AZ
  • Average humidity in December: 43%

The month with the highest relative humidity is December (43%).
The month with the lowest relative humidity is June (16%).

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Average rainfall in December
Phoenix, AZ

Average rainfall in December - Phoenix, AZ
  • Average rainfall in December: 0.59"

The wettest month (with the highest rainfall) is July (0.75").
The driest months (with the least rainfall) are May and June (0.08").

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Average rainfall days in December
Phoenix, AZ

Average rainfall days in December - Phoenix, AZ
  • Average rainfall days in December: 5 days

The month with the highest number of rainy days is July (7.8 days).
The month with the least rainy days is June (0.8 days).

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Average snowfall in December
Phoenix, AZ

Average snowfall in December - Phoenix, AZ
  • Average snowfall in December: 0"

The month with the highest snowfall is September (0.04").
The months with the least snowfall are January, February, March, April, May, June, July, August, October, November and December (0").

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Average snowfall days in December
Phoenix, AZ

Average snowfall days in December - Phoenix, AZ
  • Average snowfall days in December: 0 days

The month with the highest number of snowfall days is September (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 days).

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

Average daylight in December / Average sunshine in December - Phoenix, AZ
  • Average daylight in December: 10h and 0min

The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in December: 6h and 5min

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

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Average sunshine days in December
Phoenix, AZ

Average sunshine days in December - Phoenix, AZ
  • Average sunshine days in December: 25.5 days

The month with the most sunshine days is May (29.2 days).
The month with the least sunshine days is July (21.1 days).

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Average UV index in December
Phoenix, AZ

Average UV index in December - Phoenix, AZ
  • Average UV index in December: 3

The months with the highest UV index are May, June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in December
Phoenix, AZ

Average cloud cover in December - Phoenix, AZ
  • Average cloud cover in December: 21

The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is June (Cloud cover 5).

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Average visibility in December
Phoenix, AZ

Average visibility in December - Phoenix, 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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Phoenix, Arizona, USA

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