December weather forecastFlagstaff, AZ
December
Weather in December
December brings brilliance to winter in Flagstaff with temperatures dropping to an average low of 24.8°F (-4°C) and snowfall reaching its highest at 7.36" (187mm). Despite the chill, the city exhibits a striking winter appeal, attracting tourists. The snow blankets forest trails, mountains, and city landscapes, rendering beautiful snowy scenes. The daylight hours are minimal, marking shorter days. Thus, December symbolizes the peak of winter with a celebration of festivities amidst the snow.Temperature
Flagstaff experiences its coldest period in January and December, averaging a high-temperature of 42.6°F (5.9°C).Humidity
The average relative humidity in December is 64%.Rainfall
In Flagstaff, in December, during 3.6 rainfall days, 1.1" (28mm) of precipitation is typically accumulated. In Flagstaff, during the entire year, the rain falls for 74.8 days and collects up to 12.56" (319mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. The month with the most snowfall is December, when snow falls for 7.4 days and typically aggregates up to 7.36" (187mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 48min of daylight.On the first day of the month, sunrise is at 7:17 am and sunset at 5:14 pm. On the last day of December, in Flagstaff, sunrise is at 7:34 am and sunset at 5:24 pm MST.
Sunshine
December has the least sunshine of the year in Flagstaff, with an average of 6.8h of sunshine.UV index
The months with the lowest UV index in Flagstaff are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, the maximum UV index of 2 transforms into these recommendations:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Flagstaff, AZ
- Average high temperature in December: 42.6°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The months with the lowest average high temperature are January and December (42.6°F).
- Average low temperature in December: 24.8°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is December (24.8°F).
Average pressure in December
Flagstaff, AZ
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in December
Flagstaff, AZ
- Average wind speed in December: 6.9mph
The windiest month (with the highest average wind speed) is April (9.6mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in December
Flagstaff, AZ
- Average humidity in December: 64%
The month with the highest relative humidity is January (66%).
The month with the lowest relative humidity is June (24%).
Average rainfall in December
Flagstaff, AZ
- Average rainfall in December: 1.1"
The wettest month (with the highest rainfall) is July (2.56").
The driest month (with the least rainfall) is June (0.24").
Average rainfall days in December
Flagstaff, AZ
- Average rainfall days in December: 3.6 days
The month with the highest number of rainy days is July (16.2 days).
The months with the least rainy days are February and November (2.5 days).
Average snowfall in December
Flagstaff, AZ
- Average snowfall in December: 7.36"
The month with the highest snowfall is December (7.36").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Flagstaff, AZ
- Average snowfall days in December: 7.4 days
The month with the highest number of snowfall days is December (7.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Flagstaff, AZ
- Average daylight in December: 9h and 48min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in December: 6h and 48min
The months with the most sunshine are June and August (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).
Average sunshine days in December
Flagstaff, AZ
- Average sunshine days in December: 22.4 days
The month with the most sunshine days is June (25.8 days).
The month with the least sunshine days is July (11.4 days).
Average UV index in December
Flagstaff, AZ
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Flagstaff, AZ
- Average cloud cover in December: 24
The month with the most cloud cover is December (Cloud cover 24).
The month with the least cloud cover is June (Cloud cover 7).
Average visibility in December
Flagstaff, 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).
