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Castries vs St. Louis
Comparing Castries change · St. Louis change
Castries is the warmer of the two — about 14°C on the annual average; Castries is the wetter, with 887 mm more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Castries and St. Louis, in everyday terms.
Summers
St. Louis has hotter summers
Castries: Warm
St. Louis: Hot
Winters
Castries has far milder winters
Castries: Stays warm
St. Louis: Cold
Rain & snow
Castries is wetter
Castries: Very wet
St. Louis: Wet
Sky
Castries is sunnier
Castries: Fairly sunny
St. Louis: Partly cloudy
Month-by-month charts
Temperature
Castries is the warmer of the two — about 14°C on the annual average.
Precipitation
Castries is the wetter — about 887 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) Castries runs higher most of 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 |
| St. Louis | 5 | 8 | 13 | 20 | 25 | 30 | 32 | 31 | 27 | 21 | 13 | 7 |
| Difference | -22 | -19 | -14 | -8 | -3 | +1 | +3 | +2 | -2 | -8 | -15 | -20 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| St. Louis | 5 | 8 | 13 | 20 | 25 | 30 |
| Difference | -22 | -19 | -14 | -8 | -3 | +1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| St. Louis | 32 | 31 | 27 | 21 | 13 | 7 |
| Difference | +3 | +2 | -2 | -8 | -15 | -20 |
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 |
| St. Louis | -6 | -4 | 1 | 8 | 14 | 19 | 21 | 20 | 15 | 8 | 2 | -3 |
| Difference | -31 | -29 | -24 | -19 | -13 | -9 | -7 | -8 | -13 | -20 | -25 | -29 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| St. Louis | -6 | -4 | 1 | 8 | 14 | 19 |
| Difference | -31 | -29 | -24 | -19 | -13 | -9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| St. Louis | 21 | 20 | 15 | 8 | 2 | -3 |
| Difference | -7 | -8 | -13 | -20 | -25 | -29 |
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 |
| St. Louis | 65 | 56 | 91 | 117 | 133 | 109 | 98 | 90 | 84 | 81 | 88 | 65 |
| Difference | -48 | -20 | +25 | +27 | +19 | -25 | -118 | -201 | -140 | -165 | -154 | -85 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| St. Louis | 65 | 56 | 91 | 117 | 133 | 109 |
| Difference | -48 | -20 | +25 | +27 | +19 | -25 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| St. Louis | 98 | 90 | 84 | 81 | 88 | 65 |
| Difference | -118 | -201 | -140 | -165 | -154 | -85 |
Snowfall (cm)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — | — | — | — | — | — | — |
| St. Louis | 11 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 5 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| St. Louis | 11 | 3 | 1 | 0 | 0 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| St. Louis | 0 | 0 | 0 | 0 | 1 | 5 |
| Difference | — | — | — | — | — | — |
Cloud cover (%) St. Louis 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 |
| St. Louis | 64 | 67 | 65 | 61 | 62 | 55 | 50 | 48 | 46 | 52 | 59 | 65 |
| Difference | +26 | +28 | +23 | +12 | +10 | -4 | — | +2 | -5 | +1 | +13 | +24 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| St. Louis | 64 | 67 | 65 | 61 | 62 | 55 |
| Difference | +26 | +28 | +23 | +12 | +10 | -4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| St. Louis | 50 | 48 | 46 | 52 | 59 | 65 |
| Difference | — | +2 | -5 | +1 | +13 | +24 |
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 |
| St. Louis | 83 | 81 | 78 | 76 | 78 | 77 | 72 | 69 | 68 | 71 | 77 | 82 |
| Difference | +7 | +6 | +3 | — | +1 | -2 | -6 | -9 | -11 | -9 | -2 | +6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| St. Louis | 83 | 81 | 78 | 76 | 78 | 77 |
| Difference | +7 | +6 | +3 | — | +1 | -2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| St. Louis | 72 | 69 | 68 | 71 | 77 | 82 |
| Difference | -6 | -9 | -11 | -9 | -2 | +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 → · St. Louis 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.
St. Louis
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at ST Charles 7 Ssw (NOAA GHCN station USC00237398), about 29 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 St. Louis → · Castries page · St. Louis page