The most pleasant months of the year for Lewis and Clark County are August, July and June. In Lewis and Clark County, there are 4 comfortable months with high temperatures in the range of 70-85°. July is the hottest month for Lewis and Clark County with an average high temperature of 82.4°, which ranks it as cooler than most places in Montana. December is the snowiest month in Lewis and Clark County with 9.1 inches of snow, and 9 months of the year have significant snowfall. Days with noticeable humidity are rare throughout the year.
Summer High: the July high is around 82 degrees
Winter Low: the January low is 14
Rain: averages 14 inches of rain a year
Snow: averages 52 inches of snow a year
BESTPLACES COMFORT INDEX
The annual BestPlaces Comfort Index for the Lewis and Clark County area is 6.6 (10=best), which means it is more comfortable than most places in Montana.
6.6 / 10
A higher score indicates a more comfortable year-round climate. The US average for the comfort index is 7. Our index is based on the total number of days annually within the comfort range of 70-80 degrees, and we also applied a penalty for days of excessive humidity.
Average Monthly High and Low (°F)
Hot, Freezing, Rainy, Snowy Days: Lewis and Clark
YOU SHOULD KNOW
Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.
Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.
Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.