Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
Stepping into December, Saint Johns observes a temperature decline, with the average high falling from November's mild 57.4°F (14.1°C) to a chilly 46.6°F (8.1°C). Saint Johns's average low-temperature during December nights is observed to be a subzero cold 29.1°F (-1.6°C).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, in Saint Johns, there are 14.9 snowfall days, and 7.87" (200mm) of snow is accumulated.Daylight
December has the shortest days of the year in Saint Johns, with an average of 9h and 54min of daylight.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.
Sunshine
December has the least sunshine of the year in Saint Johns, with an average of 7h of sunshine.UV index
January, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Saint Johns. A UV Index of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, a daily UV index of 2 turns into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Frequently asked questions
What are December temperatures in Saint Johns?
What is the average humidity in December in Saint Johns?
How much does it rain in Saint Johns in December?
How many days does it snow in December in Saint Johns?
What is the month with the shortest days in Saint Johns?
What is the average length of the day in December in Saint Johns?
When is the sunrise / sunset in December in Saint Johns?
What is the month with the least sunshine in Saint Johns?
How many hours of sunshine does Saint Johns have in December?
What is the month with the lowest UV index in Saint Johns?
What is the UV index reading in December in Saint Johns?
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 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: 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).
Saint Johns, Arizona, USA
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