St. Mary Parish, LA Climate

St. Mary, LA County has a humid subtropical climate characterized by hot, humid summers and mild winters. The area generally experiences warm weather throughout the year with temperatures rarely dropping below freezing. During summertime, days are typically sunny and humid with temperatures often reaching into the upper 80s and 90s. Rainfall is fairly regular all year round but tends to be more frequent during spring and fall months. Although hurricane season can bring occasional storms, most of the time it is a relatively peaceful climate in St. Mary, LA County.

St. Mary County, Louisiana gets 62 inches of rain, on average, per year. The US average is 38 inches of rain per year.

St. Mary County averages 0 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 218 sunny days per year in St. Mary County. The US average is 205 sunny days.

St. Mary County gets some kind of precipitation, on average, 116 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 90 degrees
Winter Low: the January low is 43
Rain: averages 62 inches of rain a year
Snow: averages 0 inches of snow a year

Bestplaces Comfort Index

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

3.2 Summer - 8 Winter

October, April and November are the most pleasant months in St. Mary Parish, while July and August are the least comfortable months.

Climate	St. Mary, Louisiana	United States
	62.4 in.	38.1 in.
	0.1 in.	27.8 in.
	116.2 days	106.2 days
	218 days	205 days
	89.6°	85.8°
	43.1°	21.7°
	6.9	7
	5.8	4.3
	4 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.

August is the hottest month for St. Mary Parish with an average high temperature of 90.1°, which ranks it as one of the coolest places in Louisiana. In St. Mary Parish, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Mary Parish are April, October and May.

In St. Mary Parish, there are 48.3 days annually when the high temperature is over 90°, which is one of the coolest places in Louisiana.

January has the coldest nighttime temperatures for St. Mary Parish with an average of 43.1°. This is warmer than most places in Louisiana.

In St. Mary Parish, there are 8.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Louisiana.

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

Humidity in St. Mary Parish can be miserable in the summer, but pleasant for much of the year. The humidity here has been described as oppressive in the summer. The humid season runs from May-September and the most comfortable months are October-April.

June is the wettest month in St. Mary Parish with 7.6 inches of rain, and the driest month is April with 3.8 inches. The wettest season is Autumn with 34% of yearly precipitation and 20% occurs in Summer, which is the driest season. The annual rainfall of 62.4 inches in St. Mary Parish means that it is wetter than most places in Louisiana.

July is the rainiest month in St. Mary Parish with 14.6 days of rain, and April is the driest month with only 6.3 rainy days. There are 116.2 rainy days annually in St. Mary Parish, which is one of the rainiest places in Louisiana. The rainiest season is Autumn when it rains 35% of the time and the driest is Summer with only a 19% chance of a rainy day.

An annual snowfall of 0.1 inches in St. Mary Parish means that it is snowier than most places in Louisiana. December is the snowiest month in St. Mary Parish with 0.0 inches of snow, and no months of the year have significant snowfall.

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