December weather forecastSaint Johns, AZ
December
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 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: 9h and 54min
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: 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: 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: 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: 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).
