Hurricanes and Tornadoes That Hit Mandeville, LA

The nearest NOAA station with 1991–2020 climate normals is Covington 4 NNW, LA, 10 miles north of Mandeville at 40 feet. August is the warmest, with an average high of 90°F and low of 72°F; January is the coolest, at 62°F and 40°F. June is the wettest at 6.7 inches of precipitation on average and November the driest at 4.0 inches; the year adds up to 62.4 inches over 75 days with at least a tenth of an inch. June to November, the hurricane season months, bring 51% of the year's precipitation (31.7 of 62.4 inches); the other six months are drier. September has brought the most of the 68 tropical systems that passed within 75 miles (26); a normal September there has highs of 87°F and 4.1 inches of precipitation. Highs reach 90°F on about 83 days a year, almost all from May to October. Lows fall below freezing on about 29 nights a year. That 62.4 inches is more than at 51 of the 81 Louisiana stations used on this site (63%). Lacombe, 9 miles southeast, has its own station (Slidell Airport, LA): 61.9 inches a year, 0.5 less than here, and an August average high of 91°F against 90°F.

Water temperature at the NOAA tide station New Canal Station, LA, 25 miles south, averaged 90°F in August and 56°F in January over 2021–2025. It averaged 80°F or warmer from May to September. Sea level at the New Canal tide gauge, 25 miles from Mandeville, has risen 2.36 ± 0.19 inches per decade from 1982 to 2025, NOAA's linear trend; at that pace it is 23.6 inches in a hundred years. That is faster than at 131 of the 144 U.S. gauges with a NOAA trend.

Since 1996, the National Weather Service has logged 199 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Mandeville: 134 thunderstorm wind reports, 50 flash floods, 8 floods, 5 lightning strikes and 2 heavy rain events. They killed 2 people and injured 1, and the NWS estimated $4.1 million in property and crop damage. The strongest thunderstorm gust on record here was 81 mph, on April 4, 2011. July has had the most flash floods, 14 of 50. Of the 239 Louisiana cities on this site with a flash flood on record, 202 have had fewer than Mandeville.

Flood insurance policyholders in Mandeville's 2 ZIP codes have filed 4,636 claims with the National Flood Insurance Program since 1978, and were paid $79.2 million for buildings and contents, in the dollars of each year. The most came from Hurricane Katrina in 2005: 2,058 claims (44% of all) and $35.8 million, then Hurricane Isaac in 2012 with 454 and Flooding in 1995 with 450. 85% of the claims carry the name of a storm or flood event; the rest have no event name. Of the 219 Louisiana cities on this site with 10 or more claims, 202 have fewer than Mandeville.