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Castries vs San Antonio
Comparing Castries change · San Antonio change
Castries is the warmer of the two — about 7°C on the annual average; Castries is the wetter, with 1099 mm 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 7°C on the annual average.
Precipitation
Castries is the wetter — about 1099 mm 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 (°C) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 27 |
| San Antonio | 17 | 20 | 23 | 27 | 30 | 33 | 34 | 35 | 32 | 28 | 22 | 18 |
| Difference | -9 | -7 | -4 | -1 | +2 | +5 | +6 | +6 | +3 | -1 | -6 | -9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| San Antonio | 17 | 20 | 23 | 27 | 30 | 33 |
| Difference | -9 | -7 | -4 | -1 | +2 | +5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| San Antonio | 34 | 35 | 32 | 28 | 22 | 18 |
| Difference | +6 | +6 | +3 | -1 | -6 | -9 |
Avg low (°C) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 26 | 25 | 25 | 26 | 27 | 27 | 27 | 28 | 28 | 28 | 27 | 26 |
| San Antonio | 5 | 7 | 11 | 14 | 19 | 22 | 23 | 23 | 20 | 15 | 9 | 5 |
| Difference | -21 | -19 | -15 | -12 | -8 | -5 | -4 | -4 | -7 | -12 | -18 | -21 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| San Antonio | 5 | 7 | 11 | 14 | 19 | 22 |
| Difference | -21 | -19 | -15 | -12 | -8 | -5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| San Antonio | 23 | 23 | 20 | 15 | 9 | 5 |
| Difference | -4 | -4 | -7 | -12 | -18 | -21 |
Precipitation (mm) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 113 | 76 | 66 | 90 | 114 | 134 | 216 | 291 | 224 | 246 | 243 | 149 |
| San Antonio | 56 | 47 | 60 | 59 | 111 | 90 | 61 | 62 | 99 | 100 | 63 | 54 |
| Difference | -57 | -28 | -6 | -31 | -3 | -43 | -155 | -230 | -125 | -147 | -180 | -96 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| San Antonio | 56 | 47 | 60 | 59 | 111 | 90 |
| Difference | -57 | -28 | -6 | -31 | -3 | -43 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| San Antonio | 61 | 62 | 99 | 100 | 63 | 54 |
| Difference | -155 | -230 | -125 | -147 | -180 | -96 |
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.
← change Castries · change San Antonio → · Castries page · San Antonio page