Lewis, ID County experiences a semi-arid climate that is characterized by hot summers and cold winters. Summers are marked by warm to hot temperatures and generally low precipitation. Winters tend to be cold with some snowfall. Average annual precipitation is just over 15 inches with most of it falling between late spring and early fall. Despite the dry climate, the area is rich in vegetation, including sagebrush, juniper, and pinyon pine trees. During the summer months, temperatures can reach into the upper 90s during the day while lows reach into the mid-50s at night. In the winter months, average highs range from the mid-40s to mid-50s while lows drop into the single digits and teens at night.
Lewis County, Idaho gets 23 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Lewis County averages 52 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 Lewis County. The US average is 205 sunny days.
Lewis County gets some kind of precipitation, on average, 131 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 81 degrees
Winter Low: the January low is 23
Rain: averages 23 inches of rain a year
Snow: averages 52 inches of snow a year