St. Mary, MO Climate


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United States / Missouri / No Metro Area / Ste. Genevieve County / St. Mary / Zip Codes
St. Mary, MO experiences a humid subtropical climate with four distinct seasons and moderate precipitation throughout the year. Winters in St. Mary are mild with temperatures dipping into the 30s and light snowfall possible. Summers are hot and humid with temperatures regularly reaching into the 80s and 90s and occasional thunderstorms in the area. The spring and autumn months bring warm temperatures, pleasant humidity levels, and occasional rain showers. Overall, St. Mary experiences a temperate climate with plenty of sunshine throughout the year for outdoor activities!

St. Mary, Missouri gets 44 inches of rain, on average, per year. The US average is 38 inches of rain per year.

St. Mary averages 8 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 207 sunny days per year in St. Mary. The US average is 205 sunny days.

St. Mary 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 89 degrees
Winter Low: the January low is 22
Rain: averages 44 inches of rain a year
Snow: averages 8 inches of snow a year

Bestplaces Comfort Index

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

7.4 Summer - 5.8 Winter
September, May and October are the most pleasant months in St. Mary, while January and December are the least comfortable months.

  ClimateSt. Mary, MissouriUnited States
  43.9 in.38.1 in.
  7.6 in.27.8 in.
  88.0 days106.2 days
  207 days205 days
  89.1°85.8°
  22.0°21.7°
  7.27
  4.24.3
  387 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. Mary with an average high temperature of 89.1°, which ranks it as warmer than most places in Missouri. In St. Mary, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Mary are May, September and June.
In St. Mary, there are 39.3 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. Mary with an average of 22.0°. This is warmer than most places in Missouri.
In St. Mary, there are 103.0 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Missouri.
In St. Mary, there are 2.2 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. Mary 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. Mary.
May is the wettest month in St. Mary with 5.4 inches of rain, and the driest month is January with 2.5 inches. The wettest season is Summer with 29% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 43.9 inches in St. Mary means that it is about average compared to other places in Missouri.
May is the rainiest month in St. Mary with 10.4 days of rain, and January is the driest month with only 5.5 rainy days. There are 88.0 rainy days annually in St. Mary, which is one of the least rainy places in Missouri. The rainiest season is Summer when it rains 31% of the time and the driest is Spring with only a 21% chance of a rainy day.
An annual snowfall of 7.6 inches in St. Mary means that it is one of the least snowy places in Missouri. February is the snowiest month in St. Mary with 2.5 inches of snow, and 4 months of the year have significant snowfall.
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