Zip 63109 (St. Louis, MO) Climate

The climate in 63109 St. Louis, MO is humid continental, with hot summers and cold winters. During the summer, temperatures can reach up to 90°F (32°C) with high humidity levels and frequent thunderstorms. In winter, temperatures can dip down to around 20°F (-7°C) with significant amounts of snowfall. The area typically experiences four distinct seasons each year, with cool fall and spring temperatures in between the extremes of summer and winter.

St. Louis (zip 63109), Missouri gets 42 inches of rain, on average, per year. The US average is 38 inches of rain per year.

St. Louis (zip 63109) averages 16 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 St. Louis (zip 63109). The US average is 205 sunny days.

St. Louis (zip 63109) gets some kind of precipitation, on average, 105 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 89 degrees
Winter Low: the January low is 23
Rain: averages 42 inches of rain a year
Snow: averages 16 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for the 63109 zip code is 7.2 (10=best), which means it is more comfortable than most places in Missouri.

7.4 Summer - 5.6 Winter

September, May and October are the most pleasant months in the 63109 zip code, while January and December are the least comfortable months.

Climate	St. Louis, Missouri	United States
	42.3 in.	38.1 in.
	15.9 in.	27.8 in.
	105.0 days	106.2 days
	202 days	205 days
	88.5°	85.8°
	22.7°	21.7°
	7.2	7
	4.2	4.3
	470 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 63109 zip code with an average high temperature of 88.5°, which ranks it as about average compared to other places in Missouri. In the 63109 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 63109 zip code are May, September and June.

In the 63109 zip code, there are 35.6 days annually when the high temperature is over 90°, which is hotter than most places in Missouri.

January has the coldest nighttime temperatures for the 63109 zip code with an average of 22.7°. This is warmer than most places in Missouri.

In the 63109 zip code, there are 92.8 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Missouri.

In the 63109 zip code, there are 1.4 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Missouri.

The humidity can be uncomfortably heavy or close in the 63109 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 63109 zip code.

May is the wettest month in the 63109 zip code with 4.8 inches of rain, and the driest month is February with 2.3 inches. The wettest season is Summer with 29% of yearly precipitation and 18% occurs in Spring, which is the driest season. The annual rainfall of 42.3 inches in the 63109 zip code means that it is drier than most places in Missouri.

May is the rainiest month in the 63109 zip code with 11.2 days of rain, and September is the driest month with only 7.0 rainy days. There are 105.0 rainy days annually in the 63109 zip code, which is rainier than most places in Missouri. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 23% chance of a rainy day.

An annual snowfall of 15.9 inches in the 63109 zip code means that it is snowier than most places in Missouri. January is the snowiest month in the 63109 zip code with 5.0 inches of snow, and 5 months of the year have significant snowfall.

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