December weather forecastPorthill, ID
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Porthill, Idaho, with temperature in the range of an average low of 16.3°F (-8.7°C) and an average high of 27.3°F (-2.6°C).Temperature
December, characterized by an average high temperature of 27.3°F (-2.6°C) and a low temperature of 16.3°F (-8.7°C), is generally the coldest month.Humidity
In December, the average relative humidity is 91%.Rainfall
December is the month with the most rainfall in Porthill, Idaho. Rain falls for 11.8 days and accumulates 2.76" (70mm) of precipitation.Snowfall
Months with snowfall are January through April, September through December. In Porthill, in December, snow falls for 17.4 days, with typically accumulated 9.45" (240mm) of snow. Throughout the year, there are 70.6 snowfall days, and 41.77" (1061mm) of snow is accumulated.Daylight
December has the shortest days of the year in Porthill, with an average of 8h and 18min of daylight.On the first day of December in Porthill, sunrise is at 8:19 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 8:39 am and sunset at 4:58 pm MST.
Sunshine
In December, the average sunshine in Porthill is 4.1h.UV index
January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Porthill. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for the average person.Note: The maximum daily UV index of 1 during December translates into the following directions:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Porthill, ID
- Average high temperature in December: 27.3°F
The warmest month (with the highest average high temperature) is August (76.3°F).
The month with the lowest average high temperature is December (27.3°F).
- Average low temperature in December: 16.3°F
The month with the highest average low temperature is August (47.7°F).
The coldest months (with the lowest average low temperature) are January and December (16.3°F).
Average pressure in December
Porthill, ID
- Average pressure in December: 30.17"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Porthill, ID
- Average wind speed in December: 3.5mph
The windiest month (with the highest average wind speed) is June (4.3mph).
The calmest month (with the lowest average wind speed) is December (3.5mph).
Average humidity in December
Porthill, ID
- Average humidity in December: 91%
The month with the highest relative humidity is January (94%).
The month with the lowest relative humidity is August (55%).
Average rainfall in December
Porthill, ID
- Average rainfall in December: 2.76"
The wettest month (with the highest rainfall) is December (2.76").
The driest month (with the least rainfall) is August (0.43").
Average rainfall days in December
Porthill, ID
- Average rainfall days in December: 11.8 days
The month with the highest number of rainy days is April (19.7 days).
The month with the least rainy days is August (6.5 days).
Average snowfall in December
Porthill, ID
- Average snowfall in December: 9.45"
The month with the highest snowfall is January (11.02").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in December
Porthill, ID
- Average snowfall days in December: 17.4 days
The month with the highest number of snowfall days is December (17.4 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Porthill, ID
- Average daylight in December: 8h and 18min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in December: 4h and 6min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in December
Porthill, ID
- Average sunshine days in December: 10 days
The month with the most sunshine days is August (21.8 days).
The month with the least sunshine days is March (7.7 days).
Average UV index in December
Porthill, 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, November and December (UV index 1).
Average cloud cover in December
Porthill, ID
- Average cloud cover in December: 60
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in December
Porthill, ID
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).
