Slidell, LA climate
Slidell has warm winters and warm summers, with plenty of rain. A typical July afternoon reaches 91°, a January night drops to 42°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Slidell feels like
Winter
Spring
Summer
Fall
Slidell weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 62° | 42° | 5.7" | 0 | 11 | 0 | 44° – 59° |
| February | 66° | 45° | 4.5" | 0 | 9 | 0 | 46° – 66° |
| March | 72° | 51° | 5.1" | 0.1" | 9 | 0 | 55° – 70° |
| April | 77° | 57° | 5.5" | 0 | 8 | 0 | 63° – 72° |
| May | 84° | 65° | 5.2" | 0 | 8 | 0 | 71° – 78° |
| June | 89° | 71° | 6.6" | 0 | 11 | 0 | 78° – 83° |
| July | 91° | 73° | 7.2" | 0 | 14 | 0 | 80° – 84° |
| August | 91° | 73° | 6.7" | 0 | 14 | 0 | 79° – 85° |
| September | 87° | 69° | 5.1" | 0 | 10 | 0 | 76° – 82° |
| October | 80° | 59° | 3.9" | 0 | 7 | 0 | 66° – 74° |
| November | 70° | 49° | 4.2" | 0 | 8 | 0 | 54° – 65° |
| December | 64° | 44° | 4.8" | 0 | 10 | 0 | 47° – 62° |
| Year | 78° | 58° | 64.5" | 0.1" | 117 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Slidell
Slidell gets 65 inches of rain and melted snow a year. July is the wettest month and October the driest. Rain or snow falls on about 117 days a year.
About 281 frost-free days a year
In half of years the last 32° night comes by February 24 and the first one by December 1. That leaves about 281 frost-free days for gardens, longer than 94% of U.S. towns.
Heating and cooling a home in Slidell
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Slidell, 38% of that work is heating and 62% is cooling, so air conditioning is the bigger bill.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
How Slidell compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Slidell averaged 0.9° warmer than the 1900s. The biggest change is in February (+1.4°). The shift is smaller than in 80% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Slidell’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 46° to 66°. July is the most reliable, staying within 5°.
Common questions about Slidell’s climate
What is the coldest month in Slidell?
January, with a typical high of 62° and a low of 42°.
What is the hottest month in Slidell?
August, with a typical high of 91° and a low of 73°. About 64 days a year reach 90°.
How much snow does Slidell get?
Almost none. A normal year brings 0.1 inches.
When is the first frost in Slidell?
In half of years the first 32° night comes by December 1, and the last spring frost by February 24.
What is the rainiest month in Slidell?
July, with 7.2 inches of rain and melted snow. The year totals 65 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Slidell itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Slidell, LA (2 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.