Irmo, SC Climate

Irmo, SC has a humid subtropical climate with hot, humid summers and mild winters. The hottest months are July and August, when temperatures can reach a balmy 90 degrees Fahrenheit. Winters in Irmo tend to be mild, with temperatures rarely dropping below freezing. The average rainfall in the area is around 46 inches per year, with April and October being the wettest months. In summer months, thunderstorms can bring heavy rains as well.

Irmo, South Carolina gets 45 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Irmo averages 1 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 222 sunny days per year in Irmo. The US average is 205 sunny days.

Irmo gets some kind of precipitation, on average, 103 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 93 degrees
Winter Low: the January low is 30
Rain: averages 45 inches of rain a year
Snow: averages 1 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Irmo is 7.2 (10=best), which means it is less comfortable than most places in South Carolina.

5.3 Summer - 7 Winter

May, October and April are the most pleasant months in Irmo, while July and August are the least comfortable months.

Climate	Irmo, South Carolina	United States
	44.8 in.	38.1 in.
	0.9 in.	27.8 in.
	103.3 days	106.2 days
	222 days	205 days
	93.0°	85.8°
	30.3°	21.7°
	7.2	7
	4.9	4.3
	358 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 Irmo with an average high temperature of 93.0°, which ranks it as one of the hottest places in South Carolina. In Irmo, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Irmo are April, October and May.

In Irmo, there are 72.7 days annually when the high temperature is over 90°, which is one of the hottest places in South Carolina.

January has the coldest nighttime temperatures for Irmo with an average of 30.3°. This is colder than most places in South Carolina.

In Irmo, there are 68.8 days annually when the nighttime low temperature falls below freezing, which is colder than most places in South Carolina.

In Irmo, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in South Carolina.

Humidity in Irmo can be uncomfortable during the summer, but comfortable for most of the year. The most uncomfortably humid months are July, August and June. The humid season runs from June-September and the most comfortable months are October-May.

August is the wettest month in Irmo with 5.5 inches of rain, and the driest month is April with 2.7 inches. The wettest season is Autumn with 32% of yearly precipitation and 22% occurs in Summer, which is the driest season. The annual rainfall of 44.8 inches in Irmo means that it is drier than most places in South Carolina.

July is the rainiest month in Irmo with 10.2 days of rain, and September is the driest month with only 7.1 rainy days. There are 103.3 rainy days annually in Irmo, which is about average compared to other places in South Carolina. The rainiest season is Autumn when it rains 29% of the time and the driest is Winter with only a 21% chance of a rainy day.

An annual snowfall of 0.9 inches in Irmo means that it is about average compared to other places in South Carolina. January is the snowiest month in Irmo with 0.6 inches of snow, and 1 month of the year have significant snowfall.

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Stephen · Calera, AL

A hidden gem in an up and coming state.

Over 5 years ago

I grew up in near Annapolis MD but lived in both Savannah and Atlanta GA for twenty years. Moved to Columbia in 2009 working in IT for SC Dept of Education. Had an More

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jmd · Irmo, SC

Evenly situated between the beach and the mountain

Over 12 years ago

...there's something for More

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Thomas · Irmo, SC

Moving to Irmo

Over 14 years ago

Any thing I should know about More

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