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Sulphur, Louisiana climate
Cfa Humid subtropical
Sulphur has a seasonal warm-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 34°C, while the coldest is January averaging around 6°C at night. Around 1518 mm of precipitation falls each year, peaking in June (166 mm) and easing off in February (83 mm).
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 countsSulphur climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 17 | 19 | 23 | 26 | 30 | 33 | 33 | 34 | 32 | 28 | 22 | 19 |
| Avg temp (°C) | 12 | 14 | 17 | 21 | 25 | 28 | 29 | 29 | 27 | 22 | 16 | 13 |
| Avg low (°C) | 6 | 8 | 12 | 15 | 20 | 23 | 24 | 24 | 22 | 16 | 10 | 7 |
| Precipitation (mm) | 150 | 83 | 93 | 113 | 137 | 166 | 145 | 157 | 132 | 122 | 105 | 116 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 17 | 19 | 23 | 26 | 30 | 33 |
| Avg temp (°C) | 12 | 14 | 17 | 21 | 25 | 28 |
| Avg low (°C) | 6 | 8 | 12 | 15 | 20 | 23 |
| Precipitation (mm) | 150 | 83 | 93 | 113 | 137 | 166 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 33 | 34 | 32 | 28 | 22 | 19 |
| Avg temp (°C) | 29 | 29 | 27 | 22 | 16 | 13 |
| Avg low (°C) | 24 | 24 | 22 | 16 | 10 | 7 |
| Precipitation (mm) | 145 | 157 | 132 | 122 | 105 | 116 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 8 | 7 | 8 | 11 | 11 | 11 | 9 | 8 | 8 | 10 |
| Days with high ≥ 32°C (days) | — | — | 0.0 | 0.1 | 4 | 17 | 24 | 25 | 16 | 2 | — | — |
| Days with low ≤ 0°C (days) | 5 | 2 | 0.6 | — | — | — | — | — | — | 0.0 | 1.0 | 3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 9 | 8 | 7 | 8 | 11 |
| Days with high ≥ 32°C (days) | — | — | 0.0 | 0.1 | 4 | 17 |
| Days with low ≤ 0°C (days) | 5 | 2 | 0.6 | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 11 | 9 | 8 | 8 | 10 |
| Days with high ≥ 32°C (days) | 24 | 25 | 16 | 2 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 0.0 | 1.0 | 3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 62 | 65 | 62 | 59 | 57 | 53 | 52 | 50 | 47 | 43 | 52 | 62 |
| Clear days (≤ 30% cloud) | 7 | 6 | 7 | 7 | 7 | 8 | 8 | 9 | 11 | 13 | 9 | 6 |
| Partly cloudy days (30–70%) | 9 | 7 | 9 | 10 | 11 | 13 | 13 | 15 | 11 | 10 | 11 | 9 |
| Cloudy days (≥ 70%) | 15 | 15 | 15 | 13 | 12 | 9 | 9 | 8 | 9 | 8 | 11 | 15 |
| Relative humidity (%) | 84 | 84 | 83 | 80 | 79 | 77 | 78 | 76 | 77 | 77 | 80 | 84 |
| Wind speed (mph) | 8.1 | 8.2 | 8.3 | 8.6 | 7.8 | 6.7 | 5.8 | 5.5 | 6.7 | 7.3 | 7.7 | 8.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 62 | 65 | 62 | 59 | 57 | 53 |
| Clear days (≤ 30% cloud) | 7 | 6 | 7 | 7 | 7 | 8 |
| Partly cloudy days (30–70%) | 9 | 7 | 9 | 10 | 11 | 13 |
| Cloudy days (≥ 70%) | 15 | 15 | 15 | 13 | 12 | 9 |
| Relative humidity (%) | 84 | 84 | 83 | 80 | 79 | 77 |
| Wind speed (mph) | 8.1 | 8.2 | 8.3 | 8.6 | 7.8 | 6.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 52 | 50 | 47 | 43 | 52 | 62 |
| Clear days (≤ 30% cloud) | 8 | 9 | 11 | 13 | 9 | 6 |
| Partly cloudy days (30–70%) | 13 | 15 | 11 | 10 | 11 | 9 |
| Cloudy days (≥ 70%) | 9 | 8 | 9 | 8 | 11 | 15 |
| Relative humidity (%) | 78 | 76 | 77 | 77 | 80 | 84 |
| Wind speed (mph) | 5.8 | 5.5 | 6.7 | 7.3 | 7.7 | 8.0 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Lake Charles (NOAA GHCN station USW00003937), about 20 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.