December weather forecast and climate
Phoenix, AZ

The city of Phoenix, Arizona at dusk
The city of Phoenix, Arizona at dusk
The first month of the winter, December, is also an enjoyable month in Phoenix, Arizona, with temperature in the range of an average low of 47.8°F (8.8°C) and an average high of 63°F (17.2°C).

Temperature

With an average high-temperature of 63°F (17.2°C) and an average low-temperature of 47.8°F (8.8°C), December is the coldest month.

Humidity

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

Rainfall

In Phoenix, it is raining for 5 days, with typically 0.59" (15mm) of accumulated precipitation. Throughout the year, 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 in Phoenix, with an average of 10h of daylight.

Sunshine

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

UV index

The month with the lowest UV index is December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for average individuals.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the coldest month in Phoenix?

December is the coldest month in Phoenix, with an average high-temperature of 63°F (17.2°C) and an average low-temperature of 47.8°F (8.8°C).

What is the temperature in December in Phoenix?

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

What is the most humid month in Phoenix?

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

What is the average humidity in December in Phoenix?

In Phoenix, Arizona, the average relative humidity in December is 43%.

How much does it rain in Phoenix in December?

In Phoenix, Arizona, 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?

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

How many hours of daylight does Phoenix have in December?

The average length of the day in December is 10h.

What is the month with the least sunshine in Phoenix?

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

How many hours of sunshine does Phoenix have in December?

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

When is the lowest UV index in Phoenix?

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

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 value of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV radiation.
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).

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

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

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).

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%).

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").

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).

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

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

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).
Months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 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 the shortest days is December (Average daylight: 10h).

  • Average sunshine in December: 6.8h

The month with the most sunshine is June (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.8h).

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).

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

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).

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).

Average visibility in December - Phoenix, 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).