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
The shift from November to December involves a decrease in the average high-temperature, dropping from a frosty 45.5°F (7.5°C) to a cold 32.9°F (0.5°C). Saint John's average low-temperature in December is measured at a freezing cold 19.8°F (-6.8°C).Humidity
In Saint John, the average relative humidity in December is 79%.Rainfall
In Saint John, during December, the rain falls for 8.5 days and regularly aggregates up to 1.77" (45mm) of precipitation. Throughout the year, there are 120.7 rainfall days, and 18.39" (467mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall in Saint John, Utah. The months with the most snowfall in Saint John are January and December, with an average 12.99" (330mm) of accumulated snow.Daylight
The month with the shortest days in Saint John is December, with an average of 9h and 24min of daylight.On the first day of the month, sunrise is at 7:34 am and sunset at 5:04 pm. On the last day of December, in Saint John, Utah, sunrise is at 7:52 am and sunset at 5:13 pm MST.
Sunshine
In December, the average sunshine in Saint John is 5.6h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.Note: A maximum UV index of 1 in December translates into the following recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Frequently asked questions
How cold is December in Saint John?
What is the average humidity in December in Saint John?
How many days does it rain in December in Saint John?
When does it snow the most in Saint John?
How many days does it snow in December in Saint John?
What is the month with the shortest days in Saint John?
How many hours of daylight does Saint John have in December?
When are sunrise and sunset in December in Saint John?
How long on average sun shines in December in Saint John?
What is the month with the lowest UV index in Saint John?
What is the UV index reading in December in Saint John?
Average temperature in December
Saint John, UT
- Average high temperature in December: 32.9°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (32.4°F).
- Average low temperature in December: 19.8°F
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in December
Saint John, UT
- Average pressure in December: 30.21"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in December
Saint John, UT
- Average wind speed in December: 6.2mph
The windiest month (with the highest average wind speed) is April (7.7mph).
The calmest month (with the lowest average wind speed) is January (5.3mph).
Average humidity in December
Saint John, UT
- Average humidity in December: 79%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (33%).
Average rainfall in December
Saint John, UT
- Average rainfall in December: 1.77"
The wettest month (with the highest rainfall) is April (2.09").
The driest month (with the least rainfall) is June (0.79").
Average rainfall days in December
Saint John, UT
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is May (13.3 days).
The month with the least rainy days is November (6.5 days).
Average snowfall in December
Saint John, UT
- Average snowfall in December: 12.99"
The months with the highest snowfall are January and December (12.99").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Saint John, UT
- Average snowfall days in December: 14.5 days
The month with the highest number of snowfall days is January (14.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Saint John, UT
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 4min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 12min).
Average sunshine days in December
Saint John, UT
- Average sunshine days in December: 14.1 days
The month with the most sunshine days is October (20.1 days).
The month with the least sunshine days is February (11.6 days).
Average UV index in December
Saint John, UT
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Saint John, UT
- Average cloud cover in December: 42
The month with the most cloud cover is January (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 12).
Average visibility in December
Saint John, UT
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
Saint John, Utah, USA
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