St. Marys, IA Climate


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United States / Iowa / Des Moines-West Des Moines Metro Area / Warren County / St. Marys / Zip Codes
St. Marys, IA has a humid continental climate with warm summers and cold winters. The average temperature in the summer is around 75 degrees Fahrenheit while the average winter temperature is around 25 degrees Fahrenheit. Precipitation levels are relatively high during all months of the year, but especially in summer and winter. Snowfall is common in the winter months, often bringing several inches of snow to the area. The highest monthly precipitation occurs in May, while October brings the lowest precipitation levels to St. Marys, IA.

St. Marys, Iowa gets 36 inches of rain, on average, per year. The US average is 38 inches of rain per year.

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

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

St. Marys gets some kind of precipitation, on average, 95 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 85 degrees
Winter Low: the January low is 11
Rain: averages 36 inches of rain a year
Snow: averages 28 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for St. Marys is 7.0 (10=best), which means it is more comfortable than most places in Iowa.

8.7 Summer - 4.9 Winter
June, September and August are the most pleasant months in St. Marys, while January and December are the least comfortable months.

  ClimateSt. Marys, IowaUnited States
    Unlock38.1 in.
  27.8 in.  Unlock
    Unlock106.2 days
  205 days  Unlock
  85.0°85.8°
    Unlock21.7°
  7  Unlock
    Unlock4.3
  1027 ft.  Unlock
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. Marys with an average high temperature of 85.0°, which ranks it as warmer than most places in Iowa. In St. Marys, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Marys are September, June and August.
In St. Marys, there are 15.6 days annually when the high temperature is over 90°, which is hotter than most places in Iowa.
January has the coldest nighttime temperatures for St. Marys with an average of 11.4°. This is warmer than most places in Iowa.
In St. Marys, there are 145.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Iowa.
In St. Marys, there are 15.8 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Iowa.
The humidity is usually comfortable in St. Marys but some summer months can be unpleasant. July is the most humid month, though humidity is low for most of the year. The most humid months in St. Marys are July, August and June.
May is the wettest month in St. Marys with 5.1 inches of rain, and the driest month is January with 0.9 inches. The wettest season is Autumn with 37% of yearly precipitation and 9% occurs in Spring, which is the driest season. The annual rainfall of 36.3 inches in St. Marys means that it is wetter than most places in Iowa.
May is the rainiest month in St. Marys with 11.9 days of rain, and January is the driest month with only 5.0 rainy days. There are 94.7 rainy days annually in St. Marys, which is less rainy than most places in Iowa. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 17% chance of a rainy day.
An annual snowfall of 27.8 inches in St. Marys means that it is less snowy than most places in Iowa. February is the snowiest month in St. Marys with 7.3 inches of snow, and 7 months of the year have significant snowfall.
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