Climate in St. Louis, Missouri

St. Louis, MO has a humid continental climate with hot and humid summers and cold winters. Winters are typically cold with temperatures often dropping below freezing, with occasional snowfall. Summers are generally hot and humid, with temperatures usually rising to the mid-80s. Spring and fall are mild, with temperatures varying between the low 70s and mid-50s. The area receives an average of about 39 inches of rain annually, primarily concentrated during the warmer months of April to October.

St. Louis, Missouri gets 42 inches of rain, on average, per year. The US average is 38 inches of rain per year.

St. Louis averages 16 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. The US average is 205 sunny days.

St. Louis gets some kind of precipitation, on average, 105 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.

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Weather Highlights

Summer High: the July high is around 89 degrees
Winter Low: the January low is 23
Rain: averages 42 inches of rain a year
Snow: averages 16 inches of snow a year

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BESTPLACES COMFORT INDEX

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

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

July is the hottest month for St. Louis with an average high temperature of 88.5°, which ranks it as about average compared to other places in Missouri. In St. Louis, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Louis are May, September and June.

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In St. Louis, there are 36.0 days annually when the high temperature is over 90°, which is hotter than most places in Missouri.

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January has the coldest nighttime temperatures for St. Louis with an average of 22.8°. This is warmer than most places in Missouri.

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In St. Louis, there are 91.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Missouri.

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In St. Louis, there are 1.5 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Missouri.

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The humidity can be uncomfortably heavy or close in St. Louis 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.

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May is the wettest month in St. Louis with 4.8 inches of rain, and the driest month is February with 2.3 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 42.2 inches in St. Louis means that it is drier than most places in Missouri.

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May is the rainiest month in St. Louis with 11.3 days of rain, and September is the driest month with only 7.0 rainy days. There are 105.3 rainy days annually in St. Louis, 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 23% chance of a rainy day.

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An annual snowfall of 15.5 inches in St. Louis means that it is snowier than most places in Missouri. January is the snowiest month in St. Louis with 4.9 inches of snow, and 5 months of the year have significant snowfall.

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