Portland, IA Climate


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Portland, IA features a humid continental climate. Summers in Portland tend to be warm and muggy, with highs in the mid-80s and nighttime lows in the mid-60s. Winters are cold and snowy, with temperatures that typically range from the mid-teens to low 30s and heavy snowfall throughout much of December, January, and February. Spring and fall are generally mild with moderate temperatures ranging from the high 40s to upper 70s.

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Portland is 6.6 (10=best), which means it is one of the least comfortable places in Iowa.

9.1 Summer - 4 Winter
June, August and July are the most pleasant months in Portland, while January and December are the least comfortable months.

  ClimatePortland, IowaUnited States
  35.1 in.38.1 in.
  39.0 in.27.8 in.
  101.2 days106.2 days
  188 days205 days
  82.0°85.8°
  6.4°21.7°
  6.67
  3.84.3
  1079 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 Portland with an average high temperature of 82.0°, which ranks it as one of the coolest places in Iowa. In Portland, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Portland are June, August and July.
In Portland, there are 8.6 days annually when the high temperature is over 90°, which is cooler than most places in Iowa.
January has the coldest nighttime temperatures for Portland with an average of 6.4°. This is one of the coldest places in Iowa.
In Portland, there are 160.0 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Iowa.
In Portland, there are 25.9 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 Portland 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 Portland with 5.2 inches of rain, and the driest month is January with 0.8 inches. The wettest season is Autumn with 40% of yearly precipitation and 9% occurs in Spring, which is the driest season. The annual rainfall of 35.1 inches in Portland means that it is drier than most places in Iowa.
May is the rainiest month in Portland with 11.5 days of rain, and February is the driest month with only 5.7 rainy days. There are 101.2 rainy days annually in Portland, which is rainier than most places in Iowa. The rainiest season is Summer when it rains 29% of the time and the driest is Spring with only a 19% chance of a rainy day.
An annual snowfall of 39.0 inches in Portland means that it is one of the snowiest places in Iowa. December is the snowiest month in Portland with 9.7 inches of snow, and 6 months of the year have significant snowfall.
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