Lewiston, ID has an extreme continental climate with hot summers and cold winters. The city is located in a deep river valley at the confluence of the Snake and Clearwater rivers, making it far more temperate than other parts of Idaho. Summer temperatures usually reach into the low 90s during the day while nighttime temperatures hover around 50 degrees Fahrenheit. Winters are cold with an average low temperature of 27 degrees Fahrenheit and snowfall occurring from November through March. Spring and fall are mild with temperatures ranging from 40 to 70 degrees Fahrenheit. Precipitation in Lewiston is mainly rain, although occasional light snow does occur during the winter months.
Lewiston, Idaho gets 16 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Lewiston averages 13 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 169 sunny days per year in Lewiston. The US average is 205 sunny days.
Lewiston gets some kind of precipitation, on average, 110 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Weather Highlights
Summer High: the July high is around 88 degrees
Winter Low: the January low is 29
Rain: averages 16 inches of rain a year
Snow: averages 13 inches of snow a year