Lewis and Clark County, MT Climate

The climate in Lewis and Clark, MT County is typically quite dry. Temperatures range from the high 40s to the low 90s in the summer months, with occasional spikes into triple digits. Winter daytime highs average in the teens and twenties, with lows dipping into the single digits and below 0 at times. Annual precipitation averages 14 inches, mostly during spring and early summer with some snow scattered throughout the winter months. During late summer and fall there are often many days without rain or snowfall. This makes for a rather arid climate, however it does provide plenty of sunshine and beautiful weather throughout much of the year.

Lewis and Clark County, Montana gets 14 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Lewis and Clark County averages 52 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 186 sunny days per year in Lewis and Clark County. The US average is 205 sunny days.

Lewis and Clark County gets some kind of precipitation, on average, 88 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 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 Lewis and Clark County is 6.6 (10=best), which means it is about average compared to other places in Montana.

8.8 Summer - 4.5 Winter

July, August and June are the most pleasant months in Lewis and Clark County, while December and January are the least comfortable months.

Climate	Lewis and Clark, Montana	United States
	14.3 in.	38.1 in.
	52.1 in.	27.8 in.
	88.3 days	106.2 days
	186 days	205 days
	82.4°	85.8°
	14.1°	21.7°
	6.6	7
	3.9	4.3
	5333 ft.	2443 ft.

Climate

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.

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. In Lewis and Clark County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Lewis and Clark County are August, July and June.

In Lewis and Clark County, there are 13.1 days annually when the high temperature is over 90°, which is cooler than most places in Montana.

December has the coldest nighttime temperatures for Lewis and Clark County with an average of 13.8°. This is about average compared to other places in Montana.

In Lewis and Clark County, there are 178.4 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Montana.

In Lewis and Clark County, there are 18.2 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Montana.

Humidity is low in Lewis and Clark County, and some people might find the dryness to be uncomfortable. Days with noticeable humidity are rare throughout the year. A very dry climate can lead to cracked, itchy skin and dry eyes.

June is the wettest month in Lewis and Clark County with 2.3 inches of rain, and the driest month is January with 0.6 inches. The wettest season is Autumn with 35% of yearly precipitation and 13% occurs in Spring, which is the driest season. The annual rainfall of 14.3 inches in Lewis and Clark County means that it is about average compared to other places in Montana.

June is the rainiest month in Lewis and Clark County with 10.5 days of rain, and February is the driest month with only 5.8 rainy days. There are 88.3 rainy days annually in Lewis and Clark County, which is about average compared to other places in Montana. The rainiest season is Summer when it rains 29% of the time and the driest is Spring with only a 21% chance of a rainy day.

An annual snowfall of 52.1 inches in Lewis and Clark County means that it is snowier 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.

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