2025 Compare Climate & Weather:
Johnston, IA vs Prosper, TX

Highlights

On average, there are 228 sunny days per year in Prosper. Johnston averages 199 sunny days per year. The US average is 205 sunny days.

Prosper, Texas gets 41.3 inches of rain, on average, per year. Johnston, Iowa gets 35.9 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Prosper averages 1.3 inches of snow per year. Johnston averages 34.1 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Prosper, Texas
Summer High: the July high is around 93.9 degrees
Winter Low: the January low is 31.1
Rain: averages 41.3 inches of rain a year
Snow: averages 1.3 inches of snow a year

Johnston, Iowa
Summer High: the July high is around 85.7 degrees
Winter Low: the January low is 12.5
Rain: averages 35.9 inches of rain a year
Snow: averages 34.1 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Prosper is 7.2 (10=best), which means it is more comfortable than most places in Texas.

The annual BestPlaces Comfort Index for Johnston is 6.9 (10=best), which means it is more comfortable than most places in Iowa.

Today's Weather - Johnston, IA

83°F

Today's Weather - Prosper, TX

77°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Johnston / Prosper

July is the hottest month for Johnston with an average high temperature of 85.7°, which ranks it as warmer than most places in Iowa. In Johnston, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Johnston are September, June and May.

August is the hottest month for Prosper with an average high temperature of 95.0°, which ranks it as about average compared to other places in Texas. In Prosper, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Prosper are October, May and April.

January has the coldest nighttime temperatures for Johnston with an average of 12.5°. This is warmer than most places in Iowa.

January has the coldest nighttime temperatures for Prosper with an average of 31.1°. This is colder than most places in Texas.

In Johnston, there are 18.8 days annually when the high temperature is over 90°, which is hotter than most places in Iowa.

In Prosper, there are 77.1 days annually when the high temperature is over 90°, which is cooler than most places in Texas.

In Johnston, there are 135.0 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Iowa.

In Prosper, there are 52.9 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Texas.

In Johnston, there are 13.7 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Iowa.

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

June is the wettest month in Johnston with 5.1 inches of rain, and the driest month is January with 1.0 inches. The wettest season is Autumn with 39% of yearly precipitation and 9% occurs in Spring, which is the driest season. The annual rainfall of 35.9 inches in Johnston means that it is about average compared to other places in Iowa.


May is the wettest month in Prosper with 5.5 inches of rain, and the driest month is August with 2.3 inches. The wettest season is Summer with 31% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 41.3 inches in Prosper means that it is wetter than most places in Texas.

May is the rainiest month in Johnston with 12.4 days of rain, and January is the driest month with only 7.1 rainy days. There are 109.0 rainy days annually in Johnston, which is one of the rainiest places in Iowa. The rainiest season is Summer when it rains 29% of the time and the driest is Spring with only a 20% chance of a rainy day.

May is the rainiest month in Prosper with 8.8 days of rain, and August is the driest month with only 4.4 rainy days. There are 75.3 rainy days annually in Prosper, which is about average compared to other places in Texas. The rainiest season is Summer when it rains 30% of the time and the driest is Autumn with only a 21% chance of a rainy day.

An annual snowfall of 34.1 inches in Johnston means that it is snowier than most places in Iowa.

An annual snowfall of 1.3 inches in Prosper means that it is snowier than most places in Texas.

January is the snowiest month in Johnston with 8.6 inches of snow, and 6 months of the year have significant snowfall.

February is the snowiest month in Prosper with 0.6 inches of snow, and 1 month of the year have significant snowfall.