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Castries vs Charleston
Comparing Castries change · Charleston change
Castries is the warmer of the two — about 14°F on the annual average; Castries is the wetter, with 33 in more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Castries and Charleston, in everyday terms.
Summers
Charleston has hotter summers
Castries: Warm
Charleston: Hot
Winters
Castries has far milder winters
Castries: Stays warm
Charleston: Cool
Rain & snow
Castries is wetter
Castries: Very wet
Charleston: Wet
Sky
Castries is sunnier
Castries: Fairly sunny
Charleston: Partly cloudy
Month-by-month charts
Temperature
Castries is the warmer of the two — about 14°F on the annual average.
Precipitation
Castries is the wetter — about 33 in more across the year.
Clear skies
Castries has the clearer skies — the higher line.
Exact monthly numbers
Tap a metric to open its full table. Desktop shows all twelve months; on a phone each metric splits into Jan–Jun and Jul–Dec.
Avg high (°F) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 80 | 80 | 80 | 82 | 83 | 83 | 83 | 84 | 84 | 83 | 83 | 81 |
| Charleston | 58 | 60 | 66 | 72 | 79 | 84 | 88 | 86 | 83 | 76 | 67 | 61 |
| Difference | -22 | -20 | -15 | -9 | -4 | +1 | +4 | +3 | -1 | -8 | -15 | -20 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Charleston | 58 | 60 | 66 | 72 | 79 | 84 |
| Difference | -22 | -20 | -15 | -9 | -4 | +1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Charleston | 88 | 86 | 83 | 76 | 67 | 61 |
| Difference | +4 | +3 | -1 | -8 | -15 | -20 |
Avg low (°F) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 78 | 77 | 78 | 79 | 80 | 81 | 81 | 82 | 82 | 82 | 81 | 79 |
| Charleston | 44 | 46 | 52 | 60 | 68 | 74 | 77 | 77 | 73 | 63 | 53 | 47 |
| Difference | -34 | -31 | -26 | -19 | -12 | -7 | -4 | -5 | -10 | -18 | -28 | -33 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Charleston | 44 | 46 | 52 | 60 | 68 | 74 |
| Difference | -34 | -31 | -26 | -19 | -12 | -7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Charleston | 77 | 77 | 73 | 63 | 53 | 47 |
| Difference | -4 | -5 | -10 | -18 | -28 | -33 |
Precipitation (in) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Charleston | 2.6 | 2.6 | 3 | 3 | 2.6 | 4.9 | 5.1 | 6.1 | 5.3 | 4.1 | 2.3 | 2.9 |
| Difference | -1.9 | -0.4 | +0.4 | -0.6 | -1.9 | -0.4 | -3.4 | -5.4 | -3.6 | -5.6 | -7.3 | -3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Charleston | 2.6 | 2.6 | 3 | 3 | 2.6 | 4.9 |
| Difference | -1.9 | -0.4 | +0.4 | -0.6 | -1.9 | -0.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Charleston | 5.1 | 6.1 | 5.3 | 4.1 | 2.3 | 2.9 |
| Difference | -3.4 | -5.4 | -3.6 | -5.6 | -7.3 | -3 |
Cloud cover (%) Charleston runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 38 | 39 | 42 | 49 | 52 | 59 | 50 | 46 | 51 | 51 | 46 | 41 |
| Charleston | 68 | 70 | 60 | 49 | 50 | 57 | 57 | 59 | 58 | 51 | 56 | 66 |
| Difference | +30 | +31 | +18 | — | -2 | -2 | +7 | +13 | +7 | -1 | +10 | +26 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Charleston | 68 | 70 | 60 | 49 | 50 | 57 |
| Difference | +30 | +31 | +18 | — | -2 | -2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Charleston | 57 | 59 | 58 | 51 | 56 | 66 |
| Difference | +7 | +13 | +7 | -1 | +10 | +26 |
Relative humidity (%) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 76 | 75 | 75 | 76 | 77 | 79 | 79 | 79 | 79 | 79 | 79 | 77 |
| Charleston | 81 | 81 | 78 | 75 | 73 | 76 | 77 | 79 | 80 | 79 | 79 | 82 |
| Difference | +6 | +6 | +3 | -1 | -4 | -3 | -2 | — | +1 | -1 | — | +5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Charleston | 81 | 81 | 78 | 75 | 73 | 76 |
| Difference | +6 | +6 | +3 | -1 | -4 | -3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Charleston | 77 | 79 | 80 | 79 | 79 | 82 |
| Difference | -2 | — | +1 | -1 | — | +5 |
How both climates are changing
Both cities are warming. Each city has its own warming trend; see its trends page for the year-by-year detail. Castries trends → · Charleston trends →
Both cities' Köppen climate types are projected to hold steady through 2099 (SSP2-4.5).
Methodology & sources
Castries
Temperature — modelled for this location from ERA5-Land reanalysis, a ~9 km global grid, because no long-record weather station is close enough to use.
Precipitation — 1991–2020 normals computed from 10 years of daily observations at LE Lamentin, a weather station, about 66 km from the city centre. The underlying daily records come from NOAA's global station network.
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.
Charleston
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Dwtn Charleston (NOAA GHCN station USW00013782), inside the city.
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.
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