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
December, with its average high-temperature of 24.3°F (-4.3°C) and an average low-temperature of 8.8°F (-12.9°C), holds the record as the coldest month.Humidity
In Swan Valley, the average relative humidity in December is 91%.Rainfall
In Swan Valley, in December, during 5.8 rainfall days, 2.01" (51mm) of precipitation is typically accumulated. Throughout the year, there are 127 rainfall days, and 24.29" (617mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. In Swan Valley, during December, snow falls for 22.3 days and regularly aggregates up to 15.83" (402mm) of snow. Throughout the year, there are 126.6 snowfall days, and 110.28" (2801mm) of snow is accumulated.Daylight
The month with the shortest days in Swan Valley is December, with an average of 9h and 0min of daylight.On the first day of the month, sunrise is at 7:39 am and sunset at 4:50 pm. On the last day of December, sunrise is at 7:58 am and sunset at 4:59 pm MST.
Sunshine
The average sunshine in December is 4.2h.UV index
January through March, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.Note: A daily maximum UV index of 1 in December translates into the following instructions:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. Around midday, solar radiation is most harmful; hence, exposure should be limited. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the coldest months?
How cold is December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Swan Valley have in December?
What time are sunrise and sunset in December?
How many hours of sunshine does Swan Valley have in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
Average temperature in December
Swan Valley, ID
- Average high temperature in December: 24.3°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is December (24.3°F).
- Average low temperature in December: 8.8°F
The months with the highest average low temperature are July and August (45.3°F).
The coldest month (with the lowest average low temperature) is January (7.3°F).
Average pressure in December
Swan Valley, ID
- Average pressure in December: 30.25"Hg
The month with the highest atmospheric pressure is January (30.28"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Swan Valley, ID
- Average wind speed in December: 4.4mph
The windiest month (with the highest average wind speed) is June (5.7mph).
The calmest month (with the lowest average wind speed) is January (4.3mph).
Average humidity in December
Swan Valley, ID
- Average humidity in December: 91%
The month with the highest relative humidity is February (94%).
The month with the lowest relative humidity is August (46%).
Average rainfall in December
Swan Valley, ID
- Average rainfall in December: 2.01"
The wettest month (with the highest rainfall) is February (2.91").
The driest month (with the least rainfall) is July (0.91").
Average rainfall days in December
Swan Valley, ID
- Average rainfall days in December: 5.8 days
The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is January (4.6 days).
Average snowfall in December
Swan Valley, ID
- Average snowfall in December: 15.83"
The month with the highest snowfall is February (22.91").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Swan Valley, ID
- Average snowfall days in December: 22.3 days
The months with the highest number of snowfall days are February and December (22.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Swan Valley, ID
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 4h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).
Average sunshine days in December
Swan Valley, ID
- Average sunshine days in December: 9.3 days
The month with the most sunshine days is September (16.2 days).
The month with the least sunshine days is April (5.3 days).
Average UV index in December
Swan Valley, ID
- Average UV index in December: 1
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover in December
Swan Valley, ID
- Average cloud cover in December: 61
The month with the most cloud cover is February (Cloud cover 67).
The months with the least cloud cover are July and August (Cloud cover 13).
Average visibility in December
Swan Valley, ID
- Average visibility in December: 3mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (3mi).
Swan Valley, Idaho, USA
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