Grand River, IA Climate


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United States / Iowa / No Metro Area / Decatur County / Grand River / Zip Codes
Grand River, IA has a humid continental climate, with hot summers and cold winters. The area experiences moderate rainfall throughout the year, as well as some snowfall during the winter months. Average temperatures range from -3°C in January to 25°C in July. During summer months, temperatures can reach up to 32°C or higher on hot days. On average, Grand River receives about 160 days of sunshine each year.

Grand River, Iowa gets 38 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Grand River averages 25 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 198 sunny days per year in Grand River. The US average is 205 sunny days.

Grand River gets some kind of precipitation, on average, 99 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 85 degrees
Winter Low: the January low is 13
Rain: averages 38 inches of rain a year
Snow: averages 25 inches of snow a year

Bestplaces Comfort Index

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

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

  ClimateGrand River, IowaUnited States
  37.5 in.38.1 in.
  25.0 in.27.8 in.
  99.2 days106.2 days
  198 days205 days
  85.2°85.8°
  13.1°21.7°
  7.17
  3.94.3
  1014 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 Grand River with an average high temperature of 85.2°, which ranks it as warmer than most places in Iowa. In Grand River, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Grand River are September, June and August.
In Grand River, there are 15.6 days annually when the high temperature is over 90°, which is hotter than most places in Iowa.
January has the coldest nighttime temperatures for Grand River with an average of 13.1°. This is warmer than most places in Iowa.
In Grand River, there are 138.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Iowa.
In Grand River, there are 12.7 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Iowa.
The humidity is usually comfortable in Grand River but some summer months can be unpleasant. July is the most humid month, though humidity is low for most of the year. The most humid months in Grand River are July, August and June.
May is the wettest month in Grand River with 5.2 inches of rain, and the driest month is January with 0.8 inches. The wettest season is Autumn with 37% of yearly precipitation and 9% occurs in Spring, which is the driest season. The annual rainfall of 37.5 inches in Grand River means that it is one of the wettest places in Iowa.
May is the rainiest month in Grand River with 12.2 days of rain, and January is the driest month with only 5.0 rainy days. There are 99.2 rainy days annually in Grand River, which is about average compared to other places in Iowa. The rainiest season is Summer when it rains 31% of the time and the driest is Spring with only a 17% chance of a rainy day.
An annual snowfall of 25.0 inches in Grand River means that it is less snowy than most places in Iowa. January is the snowiest month in Grand River with 6.5 inches of snow, and 6 months of the year have significant snowfall.
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