Phoenix
Arizona, USA
Long-term weather forecast
Long-term weather forecast
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December weather forecast and Climate
Phoenix, AZ

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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.
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  • The 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).

  • The 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).

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  • The 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%).

  • The 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").

  • The 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).

  • The average daylight in December: 10h

Months with the longest days are May, June and July (Average daylight: 14h).
Months with shortest days are January, November and December (Average daylight: 10h).

  • The 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).

  • The 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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