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Mount Pleasant, South Carolina climate
Cfa Humid subtropical
Mount Pleasant has a seasonal warm-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is July with an average daily high near 33°C, while the coldest is January averaging around 3°C at night. Around 1311 mm of precipitation falls each year, peaking in August (171 mm) and easing off in November (76 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 countsMount Pleasant climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 15 | 16 | 20 | 24 | 28 | 31 | 33 | 32 | 30 | 26 | 21 | 17 |
| Avg temp (°C) | 9 | 10 | 13 | 18 | 23 | 26 | 28 | 27 | 25 | 20 | 15 | 11 |
| Avg low (°C) | 3 | 4 | 7 | 12 | 17 | 21 | 23 | 22 | 20 | 14 | 8 | 4 |
| Precipitation (mm) | 97 | 84 | 89 | 91 | 85 | 136 | 152 | 171 | 139 | 100 | 76 | 92 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 15 | 16 | 20 | 24 | 28 | 31 |
| Avg temp (°C) | 9 | 10 | 13 | 18 | 23 | 26 |
| Avg low (°C) | 3 | 4 | 7 | 12 | 17 | 21 |
| Precipitation (mm) | 97 | 84 | 89 | 91 | 85 | 136 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 33 | 32 | 30 | 26 | 21 | 17 |
| Avg temp (°C) | 28 | 27 | 25 | 20 | 15 | 11 |
| Avg low (°C) | 23 | 22 | 20 | 14 | 8 | 4 |
| Precipitation (mm) | 152 | 171 | 139 | 100 | 76 | 92 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 8 | 8 | 7 | 6 | 9 | 11 | 10 | 8 | 7 | 8 | 8 |
| Days with high ≥ 32°C (days) | — | — | — | 0.3 | 2 | 9 | 17 | 13 | 5 | 0.5 | — | — |
| Days with low ≤ 0°C (days) | 6 | 4 | 1 | 0.1 | — | — | — | — | — | 0.1 | 0.6 | 3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 8 | 8 | 7 | 6 | 9 |
| Days with high ≥ 32°C (days) | — | — | — | 0.3 | 2 | 9 |
| Days with low ≤ 0°C (days) | 6 | 4 | 1 | 0.1 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 10 | 8 | 7 | 8 | 8 |
| Days with high ≥ 32°C (days) | 17 | 13 | 5 | 0.5 | — | — |
| Days with low ≤ 0°C (days) | — | — | — | 0.1 | 0.6 | 3 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 68 | 70 | 60 | 49 | 50 | 57 | 57 | 59 | 58 | 51 | 56 | 66 |
| Clear days (≤ 30% cloud) | 4 | 3 | 7 | 11 | 10 | 7 | 7 | 6 | 7 | 11 | 9 | 5 |
| Partly cloudy days (30–70%) | 11 | 9 | 11 | 10 | 11 | 12 | 13 | 12 | 10 | 8 | 9 | 10 |
| Cloudy days (≥ 70%) | 17 | 16 | 13 | 10 | 10 | 12 | 11 | 13 | 12 | 11 | 12 | 16 |
| Relative humidity (%) | 81 | 81 | 78 | 75 | 73 | 76 | 77 | 79 | 80 | 79 | 79 | 82 |
| Wind speed (m/s) | 1.5 | 1.5 | 1.5 | 1.4 | 1.3 | 1.2 | 1.2 | 1.2 | 1.3 | 1.3 | 1.4 | 1.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 68 | 70 | 60 | 49 | 50 | 57 |
| Clear days (≤ 30% cloud) | 4 | 3 | 7 | 11 | 10 | 7 |
| Partly cloudy days (30–70%) | 11 | 9 | 11 | 10 | 11 | 12 |
| Cloudy days (≥ 70%) | 17 | 16 | 13 | 10 | 10 | 12 |
| Relative humidity (%) | 81 | 81 | 78 | 75 | 73 | 76 |
| Wind speed (m/s) | 1.5 | 1.5 | 1.5 | 1.4 | 1.3 | 1.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 59 | 58 | 51 | 56 | 66 |
| Clear days (≤ 30% cloud) | 7 | 6 | 7 | 11 | 9 | 5 |
| Partly cloudy days (30–70%) | 13 | 12 | 10 | 8 | 9 | 10 |
| Cloudy days (≥ 70%) | 11 | 13 | 12 | 11 | 12 | 16 |
| Relative humidity (%) | 77 | 79 | 80 | 79 | 79 | 82 |
| Wind speed (m/s) | 1.2 | 1.2 | 1.3 | 1.3 | 1.4 | 1.4 |
Methodology & sources
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Sullivans IS (NOAA GHCN station USC00388405), about 4 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.