December weather forecastLewiston, ID
December
Weather in December
Winter takes full effect in December with temperatures dropping significantly from November. The snowfall equivalent to January resumes, blanketing Lewiston in a white cover once again. Daylight is at its minimal, with imminent Christmas festivities lighting up the long and chilly nights. The higher humidity and lower visibility due to the snow bring a poetic end to the year in Lewiston, Idaho. Weather conditions during this month call for warm clothing, hot beverages, and cozy indoors.Temperature
Lewiston's coldest month, December, registers temperatures that range from a high of 36.1°F (2.3°C) to a low of 24.4°F (-4.2°C).Humidity
In Lewiston, the average relative humidity in December is 83%.Rainfall
In Lewiston, during December, the rain falls for 12.9 days and regularly aggregates up to 1.77" (45mm) of precipitation. In Lewiston, during the entire year, the rain falls for 142.4 days and collects up to 14.21" (361mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. In Lewiston, in December, snow falls for 8.1 days, with typically accumulated 2.56" (65mm) of snow. Throughout the year, there are 24.2 snowfall days, and 10.16" (258mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 42min of daylight.On the first day of December, sunrise is at 7:11 am and sunset at 4:02 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:11 pm PST.
Sunshine
In Lewiston, the average sunshine in December is 5.4h.UV index
In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the ordinary person.Note: In December, a daily UV index of 2 turns into the following recommendations:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. To cut down UV radiation exposure by about half, sport a wide-brim hat. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Lewiston, ID
- Average high temperature in December: 36.1°F
The warmest month (with the highest average high temperature) is August (85.3°F).
The month with the lowest average high temperature is December (36.1°F).
- Average low temperature in December: 24.4°F
The month with the highest average low temperature is August (59.2°F).
The coldest month (with the lowest average low temperature) is December (24.4°F).
Average pressure in December
Lewiston, ID
- Average pressure in December: 30.18"Hg
The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in December
Lewiston, ID
- Average wind speed in December: 5mph
The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest months (with the lowest average wind speed) are July, August and September (4.3mph).
Average humidity in December
Lewiston, ID
- Average humidity in December: 83%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is August (38%).
Average rainfall in December
Lewiston, ID
- Average rainfall in December: 1.77"
The wettest month (with the highest rainfall) is March (1.85").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days in December
Lewiston, ID
- Average rainfall days in December: 12.9 days
The month with the highest number of rainy days is March (17.6 days).
The month with the least rainy days is August (5.2 days).
Average snowfall in December
Lewiston, ID
- Average snowfall in December: 2.56"
The month with the highest snowfall is February (3.27").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Lewiston, ID
- Average snowfall days in December: 8.1 days
The month with the highest number of snowfall days is December (8.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Lewiston, ID
- Average daylight in December: 8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 5h and 24min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in December
Lewiston, ID
- Average sunshine days in December: 13.3 days
The month with the most sunshine days is July (24 days).
The months with the least sunshine days are February and March (10.8 days).
Average UV index in December
Lewiston, ID
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in December
Lewiston, ID
- Average cloud cover in December: 45
The month with the most cloud cover is February (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in December
Lewiston, ID
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
