Iona, SD Climate

Iona, SD has a continental climate, with warm to hot summers and cold winters. It experiences all four seasons, with temperatures ranging from 75°F in the summer months to an average of 17°F in the winter months. Precipitation is moderate throughout the year, averaging between 20-25 inches annually. The town gets an average of 43 days with measurable rainfall each year, mostly from April to September. Snowfall is also moderate, at around 30 inches annually. The humidity levels in Iona are fairly low year-round, making it a comfortable place to live for most people.

Bestplaces Comfort Index

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

9.1 Summer - 4.9 Winter

June, September and August are the most pleasant months in Iona, while January and December are the least comfortable months.

Climate	Iona, South Dakota	United States
	24.2 in.	38.1 in.
	43.3 in.	27.8 in.
	73.9 days	106.2 days
	225 days	205 days
	87.4°	85.8°
	11.3°	21.7°
	7.1	7
	3.5	4.3
	1808 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 Iona with an average high temperature of 87.4°, which ranks it as warmer than most places in South Dakota. In Iona, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Iona are September, June and August.

In Iona, there are 29.3 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 Iona with an average of 11.3°. This is warmer than most places in South Dakota.

In Iona, there are 156.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in South Dakota.

In Iona, there are 18.0 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in South Dakota.

Humidity in Iona 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 Iona with 4.0 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 24.2 inches in Iona means that it is about average compared to other places in South Dakota.

June is the rainiest month in Iona with 9.8 days of rain, and January is the driest month with only 3.2 rainy days. There are 73.9 rainy days annually in Iona, 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 43.3 inches in Iona means that it is snowier than most places in South Dakota. March is the snowiest month in Iona with 8.5 inches of snow, and 7 months of the year have significant snowfall.