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Castries vs San Francisco
Comparing Castries change · San Francisco change
Castries is the warmer of the two — about 23°F on the annual average; Castries is the wetter, with 54 in more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Castries and San Francisco, in everyday terms.
Summers
Castries has much hotter summers
Castries: Warm
San Francisco: Mild
Winters
Castries has far milder winters
Castries: Stays warm
San Francisco: Cool
Rain & snow
Castries is much wetter
Castries: Very wet
San Francisco: Moderate rainfall
Sky
Castries is sunnier
Castries: Fairly sunny
San Francisco: Partly cloudy
Month-by-month charts
Temperature
Castries is the warmer of the two — about 23°F on the annual average.
Precipitation
Castries is the wetter — about 54 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 |
| San Francisco | 58 | 60 | 62 | 63 | 64 | 67 | 66 | 68 | 70 | 70 | 64 | 58 |
| Difference | -22 | -20 | -18 | -19 | -19 | -17 | -17 | -16 | -14 | -14 | -19 | -23 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| San Francisco | 58 | 60 | 62 | 63 | 64 | 67 |
| Difference | -22 | -20 | -18 | -19 | -19 | -17 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| San Francisco | 66 | 68 | 70 | 70 | 64 | 58 |
| Difference | -17 | -16 | -14 | -14 | -19 | -23 |
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 Francisco | 47 | 48 | 49 | 50 | 51 | 53 | 54 | 56 | 56 | 54 | 51 | 47 |
| Difference | -31 | -30 | -29 | -29 | -29 | -28 | -27 | -26 | -26 | -27 | -30 | -32 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| San Francisco | 47 | 48 | 49 | 50 | 51 | 53 |
| Difference | -31 | -30 | -29 | -29 | -29 | -28 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| San Francisco | 54 | 56 | 56 | 54 | 51 | 47 |
| Difference | -27 | -26 | -26 | -27 | -30 | -32 |
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 Francisco | 4.4 | 4.4 | 3.2 | 1.6 | 0.7 | 0.2 | 0 | 0.1 | 0.1 | 0.9 | 2.6 | 4.8 |
| Difference | -0.1 | +1.4 | +0.5 | -1.9 | -3.8 | -5.1 | -8.5 | -11.4 | -8.7 | -8.8 | -7 | -1.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| San Francisco | 4.4 | 4.4 | 3.2 | 1.6 | 0.7 | 0.2 |
| Difference | -0.1 | +1.4 | +0.5 | -1.9 | -3.8 | -5.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| San Francisco | 0 | 0.1 | 0.1 | 0.9 | 2.6 | 4.8 |
| Difference | -8.5 | -11.4 | -8.7 | -8.8 | -7 | -1.1 |
Cloud cover (%) San Francisco 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 |
| San Francisco | 60 | 61 | 60 | 55 | 54 | 48 | 58 | 59 | 51 | 47 | 51 | 57 |
| Difference | +22 | +22 | +18 | +5 | +2 | -11 | +9 | +13 | — | -4 | +5 | +17 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| San Francisco | 60 | 61 | 60 | 55 | 54 | 48 |
| Difference | +22 | +22 | +18 | +5 | +2 | -11 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| San Francisco | 58 | 59 | 51 | 47 | 51 | 57 |
| Difference | +9 | +13 | — | -4 | +5 | +17 |
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 |
| San Francisco | 84 | 83 | 82 | 80 | 78 | 74 | 74 | 73 | 70 | 69 | 76 | 82 |
| Difference | +9 | +8 | +7 | +4 | +1 | -5 | -5 | -6 | -9 | -10 | -3 | +5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| San Francisco | 84 | 83 | 82 | 80 | 78 | 74 |
| Difference | +9 | +8 | +7 | +4 | +1 | -5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| San Francisco | 74 | 73 | 70 | 69 | 76 | 82 |
| Difference | -5 | -6 | -9 | -10 | -3 | +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 → · San Francisco 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 Francisco
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at San Francisco Dwtn (NOAA GHCN station USW00023272), 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.
← change Castries · change San Francisco → · Castries page · San Francisco page