Duncan, IA Climate


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United States / Iowa / No Metro Area / Hancock County / Duncan / Zip Codes
Duncan, IA is located in the Midwestern United States and is known for its hot, humid summers and cold winters. Average high temperatures range from the mid-30s during winter to the mid-80s during summer. Precipitation is spread relatively evenly throughout the year, with occasional snowfall in winter and occasional severe storm systems bringing heavy rains and sometimes flooding in summer. Duncan enjoys four distinct seasons that provide a variety of conditions to enjoy outdoor activities.

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Duncan is 6.7 (10=best), which means it is less comfortable than most places in Iowa.

9.1 Summer - 4.1 Winter
June, August and September are the most pleasant months in Duncan, while January and December are the least comfortable months.

  ClimateDuncan, IowaUnited States
  33.0 in.38.1 in.
  36.1 in.27.8 in.
  94.1 days106.2 days
  190 days205 days
  82.2°85.8°
  6.2°21.7°
  6.77
  3.74.3
  1240 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 Duncan with an average high temperature of 82.2°, which ranks it as one of the coolest places in Iowa. In Duncan, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Duncan are June, August and July.
In Duncan, there are 8.4 days annually when the high temperature is over 90°, which is cooler than most places in Iowa.
January has the coldest nighttime temperatures for Duncan with an average of 6.2°. This is one of the coldest places in Iowa.
In Duncan, there are 159.3 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Iowa.
In Duncan, there are 26.2 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Iowa.
The humidity is usually comfortable in Duncan but some summer months can be sticky or muggy. July is the most humid month, though humidity is low for most of the year. The most humid months are July, August and June.
June is the wettest month in Duncan with 5.0 inches of rain, and the driest month is January with 0.7 inches. The wettest season is Autumn with 41% of yearly precipitation and 8% occurs in Spring, which is the driest season. The annual rainfall of 33.0 inches in Duncan means that it is drier than most places in Iowa.
June is the rainiest month in Duncan with 10.9 days of rain, and February is the driest month with only 5.0 rainy days. There are 94.1 rainy days annually in Duncan, which is less rainy than most places in Iowa. The rainiest season is Autumn when it rains 30% of the time and the driest is Spring with only a 18% chance of a rainy day.
An annual snowfall of 36.1 inches in Duncan means that it is snowier than most places in Iowa. December is the snowiest month in Duncan with 8.9 inches of snow, and 6 months of the year have significant snowfall.
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