December weather forecast
Saint Johns, AZ

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Weather in December

December, the first month of the winter in Saint Johns, is also a frosty month, with an average temperature varying between 29.1°F (-1.6°C) and 46.6°F (8.1°C).

Temperature

During the transition into December, Saint Johns observes a decrease in the average high-temperature, falling from a refreshing 57.4°F (14.1°C) in November to a frosty 46.6°F (8.1°C). The low-temperature averages to a freezing cold 29.1°F (-1.6°C) during the nights of December.

Humidity

In December, the average relative humidity is 55%.

Rainfall

In Saint Johns, in December, during 6 rainfall days, 0.67" (17mm) of precipitation is typically accumulated. In Saint Johns, during the entire year, the rain falls for 67.8 days and collects up to 6.34" (161mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall in Saint Johns. In Saint Johns, during December, snow falls for 4.5 days and regularly aggregates up to 1.77" (45mm) of snow. Throughout the year, there are 14.9 snowfall days, and 7.87" (200mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 54min of daylight.
On the first day of the month, sunrise is at 7:06 am and sunset at 5:07 pm. On the last day of December, sunrise is at 7:24 am and sunset at 5:17 pm MST.

Sunshine

With an average of 7h of sunshine, December has the least sunshine of the year in Saint Johns.

UV index

The months with the lowest UV index are January, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum high daily UV index of 2 during December translates into the following directions:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Updated: Aug 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average December temperature?

An average high-temperature, in December, in Saint Johns, is 46.6°F (8.1°C) and the average low-temperature is 29.1°F (-1.6°C).

What is the average humidity in December?

In December, the average relative humidity is 55%.

How many days does it rain in December?

In Saint Johns, Arizona, in December, during 6 rainfall days, 0.67" (17mm) of precipitation is typically accumulated.

How much does it snow in December?

In December, it is snowing for 4.5 days. Throughout December, 1.77" (45mm) of snow is accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 54min of daylight.

How many hours of daylight does Saint Johns have in December?

In December, the average day length is 9h and 53min.

When is the sunrise / sunset in December?

On the first day of December in Saint Johns, sunrise is at 7:06 am and sunset at 5:07 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:17 pm MST.

What is the month with the least sunshine?

December has the least sunshine of the year, with an average of 7h of sunshine.

How many hours of sunshine does Saint Johns have in December?

In December, the average sunshine duration is 7h.

When is the lowest UV index?

January, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index reading in December?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Saint Johns, AZ

Average temperature in December - Saint Johns, AZ
  • Average high temperature in December: 46.6°F

The warmest months (with the highest average high temperature) are June and July (86.5°F).
The month with the lowest average high temperature is January (45.5°F).

  • Average low temperature in December: 29.1°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (28.2°F).

Average pressure in December
Saint Johns, AZ

Average pressure in December - Saint Johns, AZ
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

Average wind speed in December
Saint Johns, AZ

Average wind speed in December - Saint Johns, AZ
  • Average wind speed in December: 7.4mph

The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is January (6.2mph).

Average humidity in December
Saint Johns, AZ

Average humidity in December - Saint Johns, AZ
  • Average humidity in December: 55%

The month with the highest relative humidity is January (61%).
The month with the lowest relative humidity is June (21%).

Average rainfall in December
Saint Johns, AZ

Average rainfall in December - Saint Johns, AZ
  • Average rainfall in December: 0.67"

The wettest month (with the highest rainfall) is July (0.83").
The driest months (with the least rainfall) are May and June (0.28").

Average rainfall days in December
Saint Johns, AZ

Average rainfall days in December - Saint Johns, AZ
  • Average rainfall days in December: 6 days

The month with the highest number of rainy days is July (10.2 days).
The month with the least rainy days is November (2.9 days).

Average snowfall in December
Saint Johns, AZ

Average snowfall in December - Saint Johns, AZ
  • Average snowfall in December: 1.77"

The month with the highest snowfall is February (2.44").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Saint Johns, AZ

Average snowfall days in December - Saint Johns, AZ
  • Average snowfall days in December: 4.5 days

The month with the highest number of snowfall days is December (4.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Saint Johns, AZ

Average daylight in December / Average sunshine in December - Saint Johns, AZ
  • Average daylight in December: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in December: 7h and 0min

The month with the most sunshine is August (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).

Average sunshine days in December
Saint Johns, AZ

Average sunshine days in December - Saint Johns, AZ
  • Average sunshine days in December: 22 days

The month with the most sunshine days is June (25.8 days).
The month with the least sunshine days is July (17.4 days).

Average UV index in December
Saint Johns, AZ

Average UV index in December - Saint Johns, AZ
  • Average UV index in December: 2

The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, November and December (UV index 2).

Average cloud cover in December
Saint Johns, AZ

Average cloud cover in December - Saint Johns, 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 9).

Average visibility in December
Saint Johns, AZ

Average visibility in December - Saint Johns, AZ
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Saint Johns, Arizona, USA

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