St. Louis County, MO Climate

St. Louis, MO County has a humid continental climate, characterized by hot, humid summers and cold, dry winters. There is significant precipitation throughout the year in St. Louis, with average annual rainfall around 40 inches and snowfall averaging around 20 inches annually. The hottest month of the year is July when temperatures can reach into the upper 90s (Fahrenheit), while the coldest month is usually January when temperatures can drop to below freezing. Spring and fall are generally mild in St. Louis, although temperatures can still vary widely from day to day during these seasons.

St. Louis County, Missouri gets 43 inches of rain, on average, per year. The US average is 38 inches of rain per year.

St. Louis County averages 14 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 202 sunny days per year in St. Louis County. The US average is 205 sunny days.

St. Louis County gets some kind of precipitation, on average, 104 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 89 degrees
Winter Low: the January low is 23
Rain: averages 43 inches of rain a year
Snow: averages 14 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for St. Louis County is 7.2 (10=best), which means it is more comfortable than most places in Missouri.

7.4 Summer - 5.7 Winter

September, May and October are the most pleasant months in St. Louis County, while January and December are the least comfortable months.

Climate	St. Louis, Missouri	United States
	42.7 in.	38.1 in.
	13.8 in.	27.8 in.
	103.5 days	106.2 days
	202 days	205 days
	88.6°	85.8°
	22.6°	21.7°
	7.2	7
	4.3	4.3
	543 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 St. Louis County with an average high temperature of 88.6°, which ranks it as warmer than most places in Missouri. In St. Louis County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Louis County are May, September and June.

In St. Louis County, there are 36.4 days annually when the high temperature is over 90°, which is hotter than most places in Missouri.

January has the coldest nighttime temperatures for St. Louis County with an average of 22.6°. This is warmer than most places in Missouri.

In St. Louis County, there are 91.3 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Missouri.

In St. Louis County, there are 2.0 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Missouri.

The humidity can be uncomfortably heavy or close in St. Louis County during the summer months. July is the most humid month, though humidity is low for most of the year. July, August and June are the three most humid months in St. Louis County.

May is the wettest month in St. Louis County with 4.9 inches of rain, and the driest month is January with 2.4 inches. The wettest season is Summer with 29% of yearly precipitation and 18% occurs in Spring, which is the driest season. The annual rainfall of 42.7 inches in St. Louis County means that it is drier than most places in Missouri.

May is the rainiest month in St. Louis County with 11.2 days of rain, and September is the driest month with only 7.1 rainy days. There are 103.5 rainy days annually in St. Louis County, which is rainier than most places in Missouri. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 22% chance of a rainy day.

An annual snowfall of 13.8 inches in St. Louis County means that it is about average compared to other places in Missouri. January is the snowiest month in St. Louis County with 4.4 inches of snow, and 5 months of the year have significant snowfall.

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