Irondale, MO Climate


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United States / Missouri / No Metro Area / Washington County / Irondale / Zip Codes
Irondale, MO enjoys a mild climate with all four seasons. Summers are hot and humid with temperatures reaching the high 80s and low 90s. Winters are cold but not frigid with temperatures usually hovering around the mid-30s. Spring is generally mild and beautiful, while autumn brings cool days and colorful foliage. Precipitation is moderate throughout the year, averaging around 41 inches per year.

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Irondale is 7.3 (10=best), which means it is one of the most pleasant places in Missouri.

7.9 Summer - 5.6 Winter
September, May and June are the most pleasant months in Irondale, while January and December are the least comfortable months.

  ClimateIrondale, MissouriUnited States
  45.3 in.38.1 in.
  12.0 in.27.8 in.
  103.6 days106.2 days
  201 days205 days
  87.1°85.8°
  21.4°21.7°
  7.37
  4.44.3
  814 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 Irondale with an average high temperature of 87.1°, which ranks it as cooler than most places in Missouri. In Irondale, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Irondale are September, May and June.
In Irondale, there are 24.0 days annually when the high temperature is over 90°, which is cooler than most places in Missouri.
January has the coldest nighttime temperatures for Irondale with an average of 21.4°. This is warmer than most places in Missouri.
In Irondale, there are 104.3 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Missouri.
In Irondale, there are 2.6 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Missouri.
The humidity can be uncomfortably heavy or close in Irondale 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 Irondale.
May is the wettest month in Irondale with 5.2 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 45.3 inches in Irondale means that it is wetter than most places in Missouri.
May is the rainiest month in Irondale with 11.1 days of rain, and January is the driest month with only 6.8 rainy days. There are 103.6 rainy days annually in Irondale, 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 21% chance of a rainy day.
An annual snowfall of 12.0 inches in Irondale means that it is less snowy than most places in Missouri. February is the snowiest month in Irondale with 3.5 inches of snow, and 4 months of the year have significant snowfall.
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