December weather forecast and climate
Phoenix, AZ

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

Temperature

The coldest month 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).

Humidity

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

Rainfall

In Phoenix, during December, the rain falls for 5 days and regularly aggregates up to 0.59" (15mm) of precipitation. Throughout the year, in Phoenix, there are 44.6 rainfall days, and 5.04" (128mm) of precipitation is accumulated.

Snowfall

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

Daylight

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

Sunshine

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

UV index

The month with the lowest UV index in Phoenix is December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 3 in December transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the coldest month in Phoenix?

The coldest month in Phoenix 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 temperature in December in Phoenix?

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?

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

What is the average humidity in December in Phoenix?

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

How many days does it rain in December in Phoenix?

In December, in Phoenix, Arizona, the rain falls for 5 days. Throughout December, 0.59" (15mm) of precipitation is accumulated.

When it does not snow in Phoenix?

In Phoenix, Arizona, 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 in Phoenix, Arizona, is 10h.

What is the month with the least sunshine in Phoenix?

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

How many hours of sunshine does Phoenix have in December?

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

When is the lowest UV index in Phoenix?

December is the month with the lowest UV index, 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 is 3. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe exposure to the Sun's UV rays.
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).

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).

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).

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: 15mm

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

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: 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).

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: 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).