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
Alton experiences its lowest average temperatures in December, reaching a peak of 25.2°F (-3.8°C) and a minimum of 9.5°F (-12.5°C).Humidity
The average relative humidity in December in Alton is 89%.Rainfall
In December, the rain falls for 8.5 days. Throughout December, 1.89" (48mm) of precipitation is accumulated. In Alton, Idaho, during the entire year, the rain falls for 117.5 days and collects up to 20.24" (514mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. In Alton, during December, snow falls for 21.6 days and regularly aggregates up to 14.49" (368mm) of snow. In Alton, during the entire year, snow falls for 116.1 days and aggregates up to 91.14" (2315mm) of snow.Daylight
The month with the shortest days in Alton is December, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:34 am and sunset at 4:53 pm. On the last day of December, sunrise is at 7:53 am and sunset at 5:02 pm MST.
Sunshine
The average sunshine in December is 4.7h.UV index
The months with the lowest UV index in Alton are January, November and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index of 1 in December converts into the following recommendations:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Boost your sun resistance with garments that are densely woven yet spacious. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
Frequently asked questions
What time of the year is the coldest in Alton?
How cold is December in Alton?
What is the average humidity in December in Alton?
How much does it rain in Alton in December?
How many days does it snow in December in Alton?
What is the month with the shortest days in Alton?
How many hours of daylight does Alton have in December?
When is the sunrise / sunset in December in Alton?
How many hours of sunshine does Alton have in December?
What is the month with the lowest UV index in Alton?
How high is the UV index in December in Alton?
Average temperature in December
Alton, ID
- Average high temperature in December: 25.2°F
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is December (25.2°F).
- Average low temperature in December: 9.5°F
The month with the highest average low temperature is July (48.9°F).
The coldest month (with the lowest average low temperature) is January (7.9°F).
Average pressure in December
Alton, ID
- Average pressure in December: 30.25"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Alton, ID
- Average wind speed in December: 4.2mph
The windiest month (with the highest average wind speed) is June (5.8mph).
The calmest months (with the lowest average wind speed) are January and December (4.2mph).
Average humidity in December
Alton, ID
- Average humidity in December: 89%
The months with the highest relative humidity are January and February (92%).
The month with the lowest relative humidity is August (42%).
Average rainfall in December
Alton, ID
- Average rainfall in December: 1.89"
The wettest month (with the highest rainfall) is May (2.6").
The driest month (with the least rainfall) is July (0.63").
Average rainfall days in December
Alton, ID
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (6 days).
Average snowfall in December
Alton, ID
- Average snowfall in December: 14.49"
The month with the highest snowfall is February (18.39").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Alton, ID
- Average snowfall days in December: 21.6 days
The month with the highest number of snowfall days is December (21.6 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Alton, ID
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in December: 4h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in December
Alton, ID
- Average sunshine days in December: 9.4 days
The month with the most sunshine days is July (18.8 days).
The month with the least sunshine days is February (6.8 days).
Average UV index in December
Alton, ID
- Average UV index in December: 1
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in December
Alton, ID
- Average cloud cover in December: 55
The month with the most cloud cover is February (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in December
Alton, ID
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January and February (3mi).
Alton, Idaho, USA
Weather forecast for your location
2. Allow the app to use your location
