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Castries vs Philadelphia
Comparing Castries change · Philadelphia change
Castries is the warmer of the two — about 13°C on the annual average; Castries is the wetter, with 675 mm more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Castries and Philadelphia, in everyday terms.
Summers
Philadelphia has hotter summers
Castries: Warm
Philadelphia: Hot
Winters
Castries has far milder winters
Castries: Stays warm
Philadelphia: Cold
Rain & snow
Castries is wetter
Castries: Very wet
Philadelphia: Wet
Sky
Castries is sunnier
Castries: Fairly sunny
Philadelphia: Partly cloudy
Month-by-month charts
Temperature
Castries is the warmer of the two — about 13°C on the annual average.
Precipitation
Castries is the wetter — about 675 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 |
| Philadelphia | 5 | 7 | 12 | 19 | 24 | 29 | 32 | 31 | 27 | 20 | 14 | 8 |
| Difference | -21 | -19 | -15 | -9 | -4 | +1 | +3 | +2 | -2 | -9 | -15 | -19 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Philadelphia | 5 | 7 | 12 | 19 | 24 | 29 |
| Difference | -21 | -19 | -15 | -9 | -4 | +1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Philadelphia | 32 | 31 | 27 | 20 | 14 | 8 |
| Difference | +3 | +2 | -2 | -9 | -15 | -19 |
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 |
| Philadelphia | -2 | -1 | 2 | 8 | 14 | 19 | 22 | 21 | 17 | 11 | 5 | 1 |
| Difference | -28 | -27 | -23 | -18 | -13 | -8 | -5 | -7 | -11 | -17 | -22 | -26 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Philadelphia | -2 | -1 | 2 | 8 | 14 | 19 |
| Difference | -28 | -27 | -23 | -18 | -13 | -8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Philadelphia | 22 | 21 | 17 | 11 | 5 | 1 |
| Difference | -5 | -7 | -11 | -17 | -22 | -26 |
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 |
| Philadelphia | 92 | 85 | 115 | 102 | 103 | 121 | 121 | 126 | 124 | 105 | 86 | 108 |
| Difference | -22 | +9 | +49 | +12 | -11 | -12 | -96 | -166 | -100 | -141 | -157 | -41 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Philadelphia | 92 | 85 | 115 | 102 | 103 | 121 |
| Difference | -22 | +9 | +49 | +12 | -11 | -12 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Philadelphia | 121 | 126 | 124 | 105 | 86 | 108 |
| Difference | -96 | -166 | -100 | -141 | -157 | -41 |
Snowfall (cm)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — | — | — | — | — | — | — |
| Philadelphia | 16 | 10 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 9 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| Philadelphia | 16 | 10 | 5 | 0 | 0 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| Philadelphia | 0 | 0 | 0 | 0 | 0 | 9 |
| Difference | — | — | — | — | — | — |
Cloud cover (%) Philadelphia 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 |
| Philadelphia | 62 | 62 | 62 | 62 | 62 | 59 | 55 | 54 | 54 | 54 | 59 | 63 |
| Difference | +24 | +24 | +20 | +13 | +10 | — | +6 | +8 | +3 | +2 | +12 | +22 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Philadelphia | 62 | 62 | 62 | 62 | 62 | 59 |
| Difference | +24 | +24 | +20 | +13 | +10 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Philadelphia | 55 | 54 | 54 | 54 | 59 | 63 |
| Difference | +6 | +8 | +3 | +2 | +12 | +22 |
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 |
| Philadelphia | 84 | 83 | 81 | 78 | 79 | 78 | 73 | 73 | 74 | 77 | 80 | 84 |
| Difference | +9 | +8 | +6 | +2 | +2 | -1 | -6 | -6 | -5 | -2 | +1 | +8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Philadelphia | 84 | 83 | 81 | 78 | 79 | 78 |
| Difference | +9 | +8 | +6 | +2 | +2 | -1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Philadelphia | 73 | 73 | 74 | 77 | 80 | 84 |
| Difference | -6 | -6 | -5 | -2 | +1 | +8 |
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 → · Philadelphia 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.
Philadelphia
Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Phila Franklin Inst (NOAA GHCN station USC00366886), about 1 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 Philadelphia → · Castries page · Philadelphia page