Zip 63021 (Ballwin, MO) Climate

Ballwin, MO has a humid subtropical climate with hot and humid summer months and cold winters. The summers in Ballwin typically have temperatures in the high 80s and low 90s, with occasional heat waves that can push temperatures up near 100 degrees. Average winter temperatures are in the high 30s and low 40s, with occasional days dipping down to below freezing. Snowfall during the winter is usually light, and rainfall is spread out over most of the year, though summer storms often bring heavy rainfall during short periods of time.

Ballwin (zip 63021), Missouri gets 44 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Ballwin (zip 63021) averages 12 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 202 sunny days per year in Ballwin (zip 63021). The US average is 205 sunny days.

Ballwin (zip 63021) gets some kind of precipitation, on average, 98 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 88 degrees
Winter Low: the January low is 21
Rain: averages 44 inches of rain a year
Snow: averages 12 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for the 63021 zip code is 7.3 (10=best), which means it is one of the most pleasant places in Missouri.

7.7 Summer - 5.7 Winter

September, May and June are the most pleasant months in the 63021 zip code, while January and December are the least comfortable months.

Climate	Ballwin, Missouri	United States
	43.8 in.	38.1 in.
	12.3 in.	27.8 in.
	97.8 days	106.2 days
	202 days	205 days
	88.0°	85.8°
	21.3°	21.7°
	7.3	7
	4.3	4.3
	591 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 the 63021 zip code with an average high temperature of 88.0°, which ranks it as about average compared to other places in Missouri. In the 63021 zip code, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for the 63021 zip code are September, May and June.

In the 63021 zip code, there are 32.9 days annually when the high temperature is over 90°, which is about average compared to other places in Missouri.

January has the coldest nighttime temperatures for the 63021 zip code with an average of 21.3°. This is warmer than most places in Missouri.

In the 63021 zip code, there are 101.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Missouri.

In the 63021 zip code, there are 2.7 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Missouri.

The humidity can be uncomfortably heavy or close in the 63021 zip code during the summer months. July is the most humid month, though humidity is low for most of the year. July, August and June are the three most humid months in the 63021 zip code.

May is the wettest month in the 63021 zip code with 5.0 inches of rain, and the driest month is January with 2.4 inches. The wettest season is Summer with 28% of yearly precipitation and 18% occurs in Spring, which is the driest season. The annual rainfall of 43.8 inches in the 63021 zip code means that it is about average compared to other places in Missouri.

May is the rainiest month in the 63021 zip code with 10.8 days of rain, and January is the driest month with only 6.4 rainy days. There are 97.8 rainy days annually in the 63021 zip code, which is about average compared to other places in Missouri. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 21% chance of a rainy day.

An annual snowfall of 12.3 inches in the 63021 zip code means that it is less snowy than most places in Missouri. February is the snowiest month in the 63021 zip code with 3.7 inches of snow, and 5 months of the year have significant snowfall.

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Susan · Ballwin, MO

St. Louis is not a nice place to live

Over 13 years ago

I've lived in west county for 5 years. We have unfriendly neighbors, the church's are unwelcoming, the men here treat women like dirt. The police department is More

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