Irwin, SD Climate


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United States / South Dakota / No Metro Area / Tripp County / Irwin / Zip Codes
Irwin, SD has a temperate climate with warm summers and cold winters. The average annual temperature in Irwin is around 49 degrees Fahrenheit. During the summer months, temperatures can reach highs of up to 90 degrees Fahrenheit and during the winter months, temperatures can often dip below freezing. Precipitation in Irwin is moderate throughout the year with an average of around 27 inches of rain per year and around 36 inches of snowfall annually. Overall, Irwin experiences a pleasant climate that makes it an ideal place to live for those who enjoy mild weather all year round.
Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Irwin is 7.1 (10=best), which means it is one of the most pleasant places in South Dakota.

9.1 Summer - 5 Winter
June, September and August are the most pleasant months in Irwin, while January and December are the least comfortable months.

  ClimateIrwin, South DakotaUnited States
    Unlock38.1 in.
  44.1 in.  Unlock
    Unlock106.2 days
  228 days  Unlock
  87.3°85.8°
    Unlock21.7°
  7.1  Unlock
    Unlock4.3
  2029 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 Irwin with an average high temperature of 87.3°, which ranks it as warmer than most places in South Dakota. In Irwin, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Irwin are September, June and August.
In Irwin, there are 28.9 days annually when the high temperature is over 90°, which is hotter than most places in South Dakota.
January has the coldest nighttime temperatures for Irwin with an average of 11.7°. This is warmer than most places in South Dakota.
In Irwin, there are 155.1 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in South Dakota.
In Irwin, there are 17.6 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in South Dakota.
Humidity in Irwin is generally low and comfortable. But there some days when the humidity becomes unpleasant, especially in July and August. The most humid months (but still comfortable) are July, August and June.
June is the wettest month in Irwin with 3.9 inches of rain, and the driest month is January with 0.5 inches. The wettest season is Autumn with 39% of yearly precipitation and 7% occurs in Spring, which is the driest season. The annual rainfall of 24.4 inches in Irwin means that it is wetter than most places in South Dakota.
June is the rainiest month in Irwin with 9.7 days of rain, and January is the driest month with only 3.1 rainy days. There are 72.3 rainy days annually in Irwin, which is less rainy than most places in South Dakota. The rainiest season is Autumn when it rains 33% of the time and the driest is Spring with only a 14% chance of a rainy day.
An annual snowfall of 44.1 inches in Irwin means that it is one of the snowiest places in South Dakota. March is the snowiest month in Irwin with 8.5 inches of snow, and 7 months of the year have significant snowfall.
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