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Slidell, Louisiana climate
Cfa Humid subtropical
Slidell has a seasonal warm-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 90°F, while the coldest is January averaging around 42°F at night. Precipitation is fairly even year-round, totalling about 66 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresClear vs cloudy days
Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day countsSlidell climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 61 | 64 | 70 | 76 | 83 | 88 | 90 | 90 | 87 | 79 | 70 | 63 |
| Avg temp (°F) | 51 | 55 | 61 | 67 | 74 | 80 | 82 | 82 | 78 | 69 | 60 | 54 |
| Avg low (°F) | 42 | 45 | 52 | 58 | 66 | 72 | 74 | 74 | 70 | 59 | 49 | 44 |
| Precipitation (in) | 5.9 | 4.4 | 5.3 | 5.5 | 5.8 | 5.8 | 7.7 | 7.6 | 5.0 | 4.2 | 4.2 | 5.0 |
| Snowfall (in) | — | — | 0.1 | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 61 | 64 | 70 | 76 | 83 | 88 |
| Avg temp (°F) | 51 | 55 | 61 | 67 | 74 | 80 |
| Avg low (°F) | 42 | 45 | 52 | 58 | 66 | 72 |
| Precipitation (in) | 5.9 | 4.4 | 5.3 | 5.5 | 5.8 | 5.8 |
| Snowfall (in) | — | — | 0.1 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 90 | 90 | 87 | 79 | 70 | 63 |
| Avg temp (°F) | 82 | 82 | 78 | 69 | 60 | 54 |
| Avg low (°F) | 74 | 74 | 70 | 59 | 49 | 44 |
| Precipitation (in) | 7.7 | 7.6 | 5.0 | 4.2 | 4.2 | 5.0 |
| Snowfall (in) | — | — | — | — | — | — |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 9 | 8 | 7 | 11 | 14 | 14 | 10 | 7 | 8 | 10 |
| Days with high ≥ 90°F (days) | — | — | — | — | 2 | 12 | 20 | 20 | 9 | 0.6 | — | — |
| Days with low ≤ 32°F (days) | 6 | 3 | 0.9 | — | — | — | — | — | — | 0.0 | 1 | 4 |
| Days with snowfall ≥ 1 in (days) | — | — | 0.0 | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 10 | 9 | 9 | 8 | 7 | 11 |
| Days with high ≥ 90°F (days) | — | — | — | — | 2 | 12 |
| Days with low ≤ 32°F (days) | 6 | 3 | 0.9 | — | — | — |
| Days with snowfall ≥ 1 in (days) | — | — | 0.0 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 14 | 14 | 10 | 7 | 8 | 10 |
| Days with high ≥ 90°F (days) | 20 | 20 | 9 | 0.6 | — | — |
| Days with low ≤ 32°F (days) | — | — | — | 0.0 | 1 | 4 |
| Days with snowfall ≥ 1 in (days) | — | — | — | — | — | — |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 61 | 57 | 53 | 49 | 54 | 57 | 54 | 47 | 42 | 48 | 61 |
| Clear days (≤ 30% cloud) | 7 | 7 | 8 | 9 | 10 | 7 | 6 | 7 | 11 | 14 | 11 | 7 |
| Partly cloudy days (30–70%) | 8 | 8 | 10 | 10 | 12 | 13 | 14 | 15 | 11 | 9 | 11 | 10 |
| Cloudy days (≥ 70%) | 15 | 14 | 13 | 11 | 9 | 10 | 11 | 9 | 8 | 8 | 9 | 15 |
| Relative humidity (%) | 84 | 84 | 82 | 81 | 79 | 79 | 79 | 80 | 80 | 81 | 83 | 86 |
| Wind speed (mph) | 0.5 | 0.5 | 0.5 | 0.5 | 0.4 | 0.4 | 0.4 | 0.4 | 0.5 | 0.5 | 0.6 | 0.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 61 | 57 | 53 | 49 | 54 |
| Clear days (≤ 30% cloud) | 7 | 7 | 8 | 9 | 10 | 7 |
| Partly cloudy days (30–70%) | 8 | 8 | 10 | 10 | 12 | 13 |
| Cloudy days (≥ 70%) | 15 | 14 | 13 | 11 | 9 | 10 |
| Relative humidity (%) | 84 | 84 | 82 | 81 | 79 | 79 |
| Wind speed (mph) | 0.5 | 0.5 | 0.5 | 0.5 | 0.4 | 0.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 54 | 47 | 42 | 48 | 61 |
| Clear days (≤ 30% cloud) | 6 | 7 | 11 | 14 | 11 | 7 |
| Partly cloudy days (30–70%) | 14 | 15 | 11 | 9 | 11 | 10 |
| Cloudy days (≥ 70%) | 11 | 9 | 8 | 8 | 9 | 15 |
| Relative humidity (%) | 79 | 80 | 80 | 81 | 83 | 86 |
| Wind speed (mph) | 0.4 | 0.4 | 0.5 | 0.5 | 0.6 | 0.5 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Slidell (NOAA GHCN station USC00168539), about 2 km from the city centre.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.