St. Mary, ND Climate


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United States / North Dakota / No Metro Area / McLean County / St. Mary / Zip Codes
St. Mary, ND has an extreme climate with temperatures ranging from hot summers to cold winters. During the summer months, temperatures can reach up to 90 degrees Fahrenheit or higher while in winter they can drop well below zero. St. Mary typically receives between 18 and 22 inches of precipitation each year, which is spread throughout the year as rain and snowfall. The area also experiences strong winds from time to time throughout the year, so it is important to dress appropriately when venturing outdoors.

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for St. Mary is 6.5 (10=best), which means it is more comfortable than most places in North Dakota.

9.2 Summer - 3.8 Winter
July, August and June are the most pleasant months in St. Mary, while January and December are the least comfortable months.

  ClimateSt. Mary, North DakotaUnited States
  17.5 in.38.1 in.
  39.6 in.27.8 in.
  75.9 days106.2 days
  200 days205 days
  81.0°85.8°
  0.9°21.7°
  6.57
  3.14.3
  1914 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.

August is the hottest month for St. Mary with an average high temperature of 81.3°, which ranks it as cooler than most places in North Dakota. In St. Mary, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Mary are July, August and June.
In St. Mary, there are 10.8 days annually when the high temperature is over 90°, which is cooler than most places in North Dakota.
January has the coldest nighttime temperatures for St. Mary with an average of 0.9°. This is warmer than most places in North Dakota.
In St. Mary, there are 183.9 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in North Dakota.
In St. Mary, there are 39.7 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in North Dakota.
Humidity in St. Mary is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are July, August and June.
June is the wettest month in St. Mary with 3.6 inches of rain, and the driest month is February with 0.4 inches. The wettest season is Autumn with 48% of yearly precipitation and 8% occurs in Spring, which is the driest season. The annual rainfall of 17.5 inches in St. Mary means that it is drier than most places in North Dakota.
June is the rainiest month in St. Mary with 10.8 days of rain, and February is the driest month with only 4.0 rainy days. There are 75.9 rainy days annually in St. Mary, which is about average compared to other places in North Dakota. The rainiest season is Autumn when it rains 34% of the time and the driest is Spring with only a 18% chance of a rainy day.
An annual snowfall of 39.6 inches in St. Mary means that it is about average compared to other places in North Dakota. December is the snowiest month in St. Mary with 9.7 inches of snow, and 8 months of the year have significant snowfall.
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