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Mandeville lies on the northern shore of Lake Pontchartrain in the southeastern part of Louisiana, not far from the Alabama border. The Lake Pontchartrain Causeway connects Mandeville to New Orleans, and a commute time between the two cities of less than 45 minutes has allowed Mandeville to grow into a bedroom community for New Orleans. In the first decade of the 21st century, Mandeville’s population increased by nearly 20 percent, according to Citi-Data. Visitors to Mandeville can expect typical Deep South weather, with conditions ranging from exceedingly agreeable to downright oppressive.

Features

Mandeville falls into the same climate category as most of the southeast U.S.: humid subtropical. This climate classification consists of relatively warm winters, sultry summers and abundant precipitation -- about 62 inches of rain fall on Mandeville each year. Mandeville experiences greater cloudiness and considerably more humid conditions than the national norm, with daily relative humidity typically ranging between 60 and 90 percent.

Winter

Compared to most of the country, Mandeville’s winters are quite agreeable. Daytime high temperatures during the coldest months of December, January and February average in the low- to mid-60s Fahrenheit, with nighttime lows averaging in the low 40s. Cold fronts periodically pass through, bringing considerably chillier temperatures and the occasional snow flurry. Measurable snowfall remains quite unusual, however.

Spring

Spring begins early in Mandeville, with daily high temperatures rising throughout the 70s in March and early April, and reaching the 80s into late April and May. Overnight lows during the same period climb from the upper 40s through the mid-60s. However, the exceedingly comfortable temperatures are offset by the threat of severe weather, as opposing air masses collide over the region, producing strong thunderstorms with dangerous lightening and hail. The risk for tornadoes in Mandeville is more than double the U.S. average, making it advisable to stay tuned to weather forecasts during this potentially volatile season.

Summer

Summer in Mandeville brings steamy conditions. Daytime highs in July and August average in the low 90s and overnight lows in the low 70s, with a lack of wind and elevated humidity that makes these temperatures seem even more stifling. Only the rain brings some relief, and rain it does during Mandeville summers: July and August are the wettest months of the year, with over 6 inches of rain falling each month, on average. Tropical systems, such as tropical depressions, tropical storms and, less frequently, hurricanes, account for a proportion of this ample precipitation.

Autumn

The clouds and rain decrease considerably throughout September. Typically, just under 4 inches of rain fall in October, making it the driest month of the year. Temperatures also begin to moderate in September, with daily highs averaging in the 80s and nightly lows in the 60s. October and November bring very pleasant temperatures, with daytime highs averaging in the 70s, and overnight lows in the 50s and upper 40s for comfortable sleeping weather.

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