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Castries vs St. Louis
Comparing Castries change · St. Louis change
Castries is the warmer of the two — about 25°F on the annual average; Castries is the wetter, with 35 in 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 25°F on the annual average.
Precipitation
Castries is the wetter — about 35 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 |
| St. Louis | 40 | 46 | 56 | 67 | 77 | 85 | 89 | 88 | 81 | 70 | 56 | 45 |
| Difference | -40 | -34 | -25 | -14 | -6 | +2 | +6 | +4 | -3 | -14 | -27 | -37 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| St. Louis | 40 | 46 | 56 | 67 | 77 | 85 |
| Difference | -40 | -34 | -25 | -14 | -6 | +2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| St. Louis | 89 | 88 | 81 | 70 | 56 | 45 |
| Difference | +6 | +4 | -3 | -14 | -27 | -37 |
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 |
| St. Louis | 22 | 25 | 35 | 46 | 56 | 65 | 69 | 67 | 58 | 46 | 36 | 27 |
| Difference | -56 | -52 | -43 | -33 | -24 | -16 | -12 | -15 | -24 | -35 | -45 | -53 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| St. Louis | 22 | 25 | 35 | 46 | 56 | 65 |
| Difference | -56 | -52 | -43 | -33 | -24 | -16 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| St. Louis | 69 | 67 | 58 | 46 | 36 | 27 |
| Difference | -12 | -15 | -24 | -35 | -45 | -53 |
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 |
| St. Louis | 2.6 | 2.2 | 3.6 | 4.6 | 5.2 | 4.3 | 3.9 | 3.5 | 3.3 | 3.2 | 3.5 | 2.5 |
| Difference | -1.9 | -0.8 | +1 | +1.1 | +0.7 | -1 | -4.7 | -7.9 | -5.5 | -6.5 | -6.1 | -3.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| St. Louis | 2.6 | 2.2 | 3.6 | 4.6 | 5.2 | 4.3 |
| Difference | -1.9 | -0.8 | +1 | +1.1 | +0.7 | -1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| St. Louis | 3.9 | 3.5 | 3.3 | 3.2 | 3.5 | 2.5 |
| Difference | -4.7 | -7.9 | -5.5 | -6.5 | -6.1 | -3.3 |
Snowfall (in)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — | — | — | — | — | — | — |
| St. Louis | 4.2 | 1.1 | 0.3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.4 | 2.1 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| St. Louis | 4.2 | 1.1 | 0.3 | 0 | 0 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| St. Louis | 0 | 0 | 0 | 0 | 0.4 | 2.1 |
| 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.
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