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Castries vs Philadelphia
Comparing Castries change · Philadelphia change
Castries is the warmer of the two — about 23°F on the annual average; Castries is the wetter, with 27 in 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 23°F on the annual average.
Precipitation
Castries is the wetter — about 27 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 |
| Philadelphia | 42 | 45 | 54 | 66 | 76 | 85 | 89 | 87 | 80 | 68 | 56 | 47 |
| Difference | -39 | -35 | -27 | -16 | -7 | +2 | +6 | +3 | -4 | -15 | -26 | -35 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Philadelphia | 42 | 45 | 54 | 66 | 76 | 85 |
| Difference | -39 | -35 | -27 | -16 | -7 | +2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Philadelphia | 89 | 87 | 80 | 68 | 56 | 47 |
| Difference | +6 | +3 | -4 | -15 | -26 | -35 |
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 |
| Philadelphia | 28 | 30 | 36 | 46 | 56 | 66 | 71 | 70 | 63 | 51 | 41 | 33 |
| Difference | -50 | -48 | -41 | -33 | -24 | -15 | -10 | -12 | -19 | -31 | -39 | -46 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Philadelphia | 28 | 30 | 36 | 46 | 56 | 66 |
| Difference | -50 | -48 | -41 | -33 | -24 | -15 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Philadelphia | 71 | 70 | 63 | 51 | 41 | 33 |
| Difference | -10 | -12 | -19 | -31 | -39 | -46 |
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 |
| Philadelphia | 3.6 | 3.3 | 4.5 | 4 | 4.1 | 4.8 | 4.8 | 5 | 4.9 | 4.2 | 3.4 | 4.3 |
| Difference | -0.9 | +0.4 | +1.9 | +0.5 | -0.4 | -0.5 | -3.8 | -6.5 | -3.9 | -5.6 | -6.2 | -1.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Philadelphia | 3.6 | 3.3 | 4.5 | 4 | 4.1 | 4.8 |
| Difference | -0.9 | +0.4 | +1.9 | +0.5 | -0.4 | -0.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Philadelphia | 4.8 | 5 | 4.9 | 4.2 | 3.4 | 4.3 |
| Difference | -3.8 | -6.5 | -3.9 | -5.6 | -6.2 | -1.6 |
Snowfall (in)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — | — | — | — | — | — | — |
| Philadelphia | 6.4 | 4 | 2 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 0.1 | 3.5 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| Philadelphia | 6.4 | 4 | 2 | 0.1 | 0 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| Philadelphia | 0 | 0 | 0 | 0 | 0.1 | 3.5 |
| 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