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Castries vs San Antonio
Comparing Castries change · San Antonio change
Castries is the warmer of the two — about 12°F on the annual average; Castries is the wetter, with 43 in more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Castries and San Antonio, in everyday terms.
Summers
San Antonio has much hotter summers
Castries: Warm
San Antonio: Very hot
Winters
Castries has far milder winters
Castries: Stays warm
San Antonio: Cool
Rain & snow
Castries is much wetter
Castries: Very wet
San Antonio: Moderate rainfall
Sky
Castries is sunnier
Castries: Fairly sunny
San Antonio: Partly cloudy
Month-by-month charts
Temperature
Castries is the warmer of the two — about 12°F on the annual average.
Precipitation
Castries is the wetter — about 43 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) Varies through 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 |
| San Antonio | 63 | 68 | 74 | 80 | 86 | 92 | 94 | 95 | 90 | 82 | 71 | 64 |
| Difference | -17 | -12 | -7 | -1 | +3 | +9 | +11 | +12 | +6 | -2 | -11 | -17 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| San Antonio | 63 | 68 | 74 | 80 | 86 | 92 |
| Difference | -17 | -12 | -7 | -1 | +3 | +9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| San Antonio | 94 | 95 | 90 | 82 | 71 | 64 |
| Difference | +11 | +12 | +6 | -2 | -11 | -17 |
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 |
| San Antonio | 40 | 44 | 51 | 57 | 66 | 72 | 74 | 74 | 69 | 59 | 49 | 41 |
| Difference | -38 | -34 | -27 | -21 | -15 | -9 | -7 | -8 | -13 | -22 | -32 | -38 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| San Antonio | 40 | 44 | 51 | 57 | 66 | 72 |
| Difference | -38 | -34 | -27 | -21 | -15 | -9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| San Antonio | 74 | 74 | 69 | 59 | 49 | 41 |
| Difference | -7 | -8 | -13 | -22 | -32 | -38 |
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 |
| San Antonio | 2.2 | 1.9 | 2.4 | 2.3 | 4.4 | 3.6 | 2.4 | 2.4 | 3.9 | 3.9 | 2.5 | 2.1 |
| Difference | -2.3 | -1.1 | -0.2 | -1.2 | -0.1 | -1.7 | -6.1 | -9 | -4.9 | -5.8 | -7.1 | -3.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| San Antonio | 2.2 | 1.9 | 2.4 | 2.3 | 4.4 | 3.6 |
| Difference | -2.3 | -1.1 | -0.2 | -1.2 | -0.1 | -1.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| San Antonio | 2.4 | 2.4 | 3.9 | 3.9 | 2.5 | 2.1 |
| Difference | -6.1 | -9 | -4.9 | -5.8 | -7.1 | -3.8 |
Cloud cover (%) Varies through 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 |
| San Antonio | 58 | 61 | 62 | 59 | 61 | 49 | 43 | 43 | 48 | 45 | 53 | 58 |
| Difference | +19 | +23 | +20 | +10 | +9 | -10 | -7 | -3 | -3 | -6 | +7 | +17 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| San Antonio | 58 | 61 | 62 | 59 | 61 | 49 |
| Difference | +19 | +23 | +20 | +10 | +9 | -10 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| San Antonio | 43 | 43 | 48 | 45 | 53 | 58 |
| Difference | -7 | -3 | -3 | -6 | +7 | +17 |
Relative humidity (%) Castries runs higher most of 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 |
| San Antonio | 71 | 70 | 69 | 66 | 69 | 67 | 63 | 61 | 67 | 68 | 70 | 71 |
| Difference | -5 | -4 | -5 | -10 | -9 | -12 | -15 | -18 | -12 | -11 | -9 | -6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| San Antonio | 71 | 70 | 69 | 66 | 69 | 67 |
| Difference | -5 | -4 | -5 | -10 | -9 | -12 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| San Antonio | 63 | 61 | 67 | 68 | 70 | 71 |
| Difference | -15 | -18 | -12 | -11 | -9 | -6 |
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 → · San Antonio 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.
San Antonio
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at San Antonio Incarnate Word (NOAA GHCN station USC00417947), about 6 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.
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