December weather forecast
Phoenix, AZ

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

Weather in December

December, the first month of the winter, in Phoenix, is also an enjoyable month, with average temperature ranging between max 63°F (17.2°C) and min 47.8°F (8.8°C).

Temperature

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

Humidity

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

Rainfall

In Phoenix, during December, the rain falls for 5 days and regularly aggregates up to 0.59" (15mm) of precipitation. In Phoenix, during the entire year, the rain falls for 44.6 days and collects up to 5.04" (128mm) of precipitation.

Snowfall

January through August, October through December are months without snowfall.

Daylight

The month with the shortest days in Phoenix is December, with an average of 10h of daylight.

Sunshine

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

UV index

With an average maximum UV index of 3, December is the month with the lowest UV index. A UV Index of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 3 in December interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. 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.
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FAQ

What is the coldest month in Phoenix?

The coldest month in Phoenix, Arizona, is December, 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 most humid month in Phoenix?

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

What is the average humidity in December in Phoenix?

The average relative humidity in December is 43%.

How much does it rain in Phoenix in December?

In Phoenix, in December, it is raining for 5 days, with typically 0.59" (15mm) of accumulated precipitation.

When it does not snow in Phoenix?

January through August, October through December are months without snowfall in Phoenix, Arizona.

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.

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

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

What is the month with the least sunshine in Phoenix?

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

How long on average sun shines in December in Phoenix?

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

What is the month with 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.

What is the UV index intensity in December in Phoenix?

The average daily maximum UV index in December in Phoenix, Arizona, is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in December
Phoenix, AZ

Average temperature in December - Phoenix, AZ
  • Average high temperature in December: 17.2°C

The warmest month (with the highest average high temperature) is July (39.8°C).
The month with the lowest average high temperature is December (17.2°C).

  • Average low temperature in December: 8.8°C

The month with the highest average low temperature is August (29.3°C).
The coldest month (with the lowest average low temperature) is January (8.6°C).

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Average pressure in December
Phoenix, AZ

Average pressure in December - Phoenix, AZ
  • Average pressure in December: 1017.8mbar

The month with the highest atmospheric pressure is January (1018.9mbar).
The month with the lowest atmospheric pressure is June (1009.5mbar).

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Average wind speed in December
Phoenix, AZ

Average wind speed in December - Phoenix, AZ
  • Average wind speed in December: 7km/h

The windiest month (with the highest average wind speed) is April (10.3km/h).
The calmest month (with the lowest average wind speed) is December (7km/h).

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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: 15mm

The wettest month (with the highest rainfall) is July (19mm).
The driest months (with the least rainfall) are May and June (2mm).

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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: 0mm

The month with the highest snowfall is September (1mm).
Months with the least snowfall are January, February, March, April, May, June, July, August, October, November and December (0mm).

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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).
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

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).

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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

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: 10km

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).

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