December weather forecast and climate
Phoenix, AZ

The city of Phoenix, Arizona, at dusk
The city of Phoenix, Arizona, at dusk
December is pleasant and inviting with its festivities that are made possible by the warm temperatures ranging between 39.2°F (4°C) and 66.2°F (19°C). Although these temperatures are almost high as the highest temperatures some U.S. cities reach during summer, this is the coldest Phoenix gets, as the sun shines for up to eight hours in a day.
The rain will fall for an average of four days all month long collecting precipitation of 0.9" (22.9mm). With a 22% humidity score, there is no better way to close the year than indulging in the outdoor celebrations of the festivities.

What is the coldest month in Phoenix?

The coldest month in Phoenix, Arizona, is December, with an average high-temperature of 66°F (18.9°C) and an average low-temperature of 44.8°F (7.1°C).

What is the temperature in December in Phoenix?

In December, in Phoenix, the average high-temperature is 66°F (18.9°C), and the average low-temperature is 44.8°F (7.1°C).

What is the most humid month in Phoenix?

December is the most humid month in Phoenix, Arizona, with an average relative humidity of 51.8%.

What is the average humidity in December in Phoenix?

In Phoenix, Arizona, the average relative humidity in December is 51.8%.

How much does it rain in Phoenix in December?

In Phoenix, in December, it is raining for 3.9 days, with typically 0.9" (22.4mm) of accumulated precipitation.

What is the month with the shortest days in Phoenix?

With an average of 10h of daylight, December has the shortest days of the year.

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

In December, the average length of the day in Phoenix is 10h.

What is the month with the least sunshine in Phoenix?

December has the least sunshine of the year in Phoenix, with an average of 7.9h of sunshine.

How long on average sun shines in December in Phoenix?

In Phoenix, the average sunshine in December is 7.9h.

What is the month with the lowest UV index in Phoenix?

January and December, with an average UV index of 3, are months with the lowest UV index in Phoenix.

What is the UV index reading in December in Phoenix?

In Phoenix, the average UV index in December is 3.
Average temperature in December - Phoenix, AZ
  • Average high temperature in December: 66°F

The warmest month (with the highest average high temperature) is July (106.1°F).
The month with the lowest average high temperature is December (66°F).

  • Average low temperature in December: 44.8°F

The month with the highest average low temperature is July (83.5°F).
The coldest month (with the lowest average low temperature) is December (44.8°F).

Average humidity in December - Phoenix, AZ
  • Average humidity in December: 51.8%

The month with the highest relative humidity is December (51.8%).
The month with the lowest relative humidity is June (19.4%).

Average rainfall in December - Phoenix, AZ
  • Average rainfall in December: 0.9"

The wettest month (with the highest rainfall) is July (1.1").
The driest month (with the lowest rainfall) is June (0").

Average rainfall days in December - Phoenix, AZ
  • Average rainfall days in December: 3.9 days

The month with the highest number of rainy days is August (5 days).
The month with the lowest number of rainy days is June (0.5 days).

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

The month with the longest days is June (Average daylight: 14.3h).
The month with shortest days is December (Average daylight: 10h).

  • Average sunshine in December: 7.9h

The month with most sunshine is June (Average sunshine: 13.6h).
The month with least sunshine is December (Average sunshine: 7.9h).

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

The month with the highest UV index is July (UV index 11).
Months with the lowest UV index are January and December (UV index 3).

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