December weather forecastLewiston, UT
December
Weather in December
December, the first month of the winter in Lewiston, is still a freezing cold month, with an average temperature fluctuating between 15.1°F (-9.4°C) and 28.6°F (-1.9°C).Temperature
Lewiston's December weather, marked by an average high temperature of 28.6°F (-1.9°C) and an average low temperature of 15.1°F (-9.4°C), is the coldest in the year.Humidity
In December, the average relative humidity in Lewiston, Utah, is 86%.Rainfall
In December, in Lewiston, Utah, the rain falls for 8.2 days. Throughout December, 1.77" (45mm) of precipitation is accumulated. Throughout the year, there are 117.9 rainfall days, and 17.68" (449mm) of precipitation is accumulated.Snowfall
Months with snowfall in Lewiston, Utah, are January through May, September through December. In Lewiston, Utah, in December, during 15.1 snowfall days, 11.73" (298mm) of snow is typically accumulated. In Lewiston, Utah, during the entire year, snow falls for 71.1 days and aggregates up to 56.1" (1425mm) of snow.Daylight
With an average of 9h and 12min of daylight, December has the shortest days of the year in Lewiston.On the first day of the month, sunrise is at 7:36 am and sunset at 4:56 pm. On the last day of December, in Lewiston, sunrise is at 7:55 am and sunset at 5:06 pm MST.
Sunshine
In Lewiston, the average sunshine in December is 5.2h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the 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. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Lewiston, UT
- Average high temperature in December: 28.6°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is December (28.6°F).
- Average low temperature in December: 15.1°F
The month with the highest average low temperature is July (55.4°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).
Average pressure in December
Lewiston, UT
- 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 (29.89"Hg).
Average wind speed in December
Lewiston, UT
- Average wind speed in December: 4.3mph
The windiest months (with the highest average wind speed) are April, June and August (5.7mph).
The calmest month (with the lowest average wind speed) is January (4.2mph).
Average humidity in December
Lewiston, UT
- Average humidity in December: 86%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (38%).
Average rainfall in December
Lewiston, UT
- Average rainfall in December: 1.77"
The wettest month (with the highest rainfall) is January (2.24").
The driest month (with the least rainfall) is July (0.63").
Average rainfall days in December
Lewiston, UT
- Average rainfall days in December: 8.2 days
The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is November (6.7 days).
Average snowfall in December
Lewiston, UT
- Average snowfall in December: 11.73"
The month with the highest snowfall is January (16.73").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Lewiston, UT
- Average snowfall days in December: 15.1 days
The month with the highest number of snowfall days is January (15.9 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Lewiston, UT
- Average daylight in December: 9h and 12min
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: 5h and 12min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in December
Lewiston, UT
- Average sunshine days in December: 13.5 days
The month with the most sunshine days is October (19.4 days).
The month with the least sunshine days is February (9.1 days).
Average UV index in December
Lewiston, UT
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Lewiston, UT
- Average cloud cover in December: 46
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 10).
Average visibility in December
Lewiston, UT
- Average visibility in December: 4mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
