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Castries vs Porto
Comparing Castries change · Porto change
Castries is the warmer of the two — about 12°C on the annual average; Castries is the wetter, with 853 mm more rain a year.
How the seasons compare
The differences between Castries and Porto, in everyday terms.
Summers
Castries has much hotter summers
Castries: Warm
Porto: Mild
Winters
Castries has far milder winters
Castries: Stays warm
Porto: Cool
Rain & snow
Castries is wetter
Castries: Very wet
Porto: Wet
Sky
Similar amounts of sun
Castries: Fairly sunny
Porto: Partly cloudy
Month-by-month charts
Temperature
Castries is the warmer of the two — about 12°C on the annual average.
Precipitation
Castries is the wetter — about 853 mm more across the year.
Clear skies
The two cities see a similar amount of sun.
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 |
| Porto | 14 | 15 | 17 | 18 | 20 | 23 | 24 | 25 | 24 | 21 | 17 | 15 |
| Difference | -13 | -12 | -10 | -9 | -8 | -6 | -4 | -4 | -5 | -8 | -11 | -13 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Porto | 14 | 15 | 17 | 18 | 20 | 23 |
| Difference | -13 | -12 | -10 | -9 | -8 | -6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Porto | 24 | 25 | 24 | 21 | 17 | 15 |
| Difference | -4 | -4 | -5 | -8 | -11 | -13 |
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 |
| Porto | 6 | 6 | 8 | 9 | 12 | 14 | 15 | 15 | 14 | 12 | 9 | 7 |
| Difference | -19 | -19 | -17 | -17 | -15 | -13 | -12 | -13 | -14 | -15 | -18 | -19 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Porto | 6 | 6 | 8 | 9 | 12 | 14 |
| Difference | -19 | -19 | -17 | -17 | -15 | -13 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Porto | 15 | 15 | 14 | 12 | 9 | 7 |
| Difference | -12 | -13 | -14 | -15 | -18 | -19 |
Precipitation (mm) Varies through 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 |
| Porto | 147 | 88 | 104 | 99 | 87 | 32 | 13 | 27 | 66 | 138 | 160 | 147 |
| Difference | +34 | +12 | +38 | +9 | -27 | -102 | -203 | -264 | -158 | -108 | -83 | -2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Porto | 147 | 88 | 104 | 99 | 87 | 32 |
| Difference | +34 | +12 | +38 | +9 | -27 | -102 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Porto | 13 | 27 | 66 | 138 | 160 | 147 |
| Difference | -203 | -264 | -158 | -108 | -83 | -2 |
Cloud cover (%) Varies through 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 |
| Porto | 58 | 53 | 54 | 56 | 53 | 45 | 35 | 36 | 43 | 53 | 56 | 59 |
| Difference | +20 | +14 | +12 | +7 | +1 | -14 | -14 | -10 | -8 | +2 | +10 | +18 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Porto | 58 | 53 | 54 | 56 | 53 | 45 |
| Difference | +20 | +14 | +12 | +7 | +1 | -14 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Porto | 35 | 36 | 43 | 53 | 56 | 59 |
| Difference | -14 | -10 | -8 | +2 | +10 | +18 |
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 |
| Porto | 85 | 83 | 81 | 80 | 78 | 75 | 73 | 72 | 74 | 79 | 83 | 85 |
| Difference | +9 | +8 | +6 | +4 | +1 | -3 | -6 | -7 | -4 | — | +4 | +8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Porto | 85 | 83 | 81 | 80 | 78 | 75 |
| Difference | +9 | +8 | +6 | +4 | +1 | -3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Porto | 73 | 72 | 74 | 79 | 83 | 85 |
| Difference | -6 | -7 | -4 | — | +4 | +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 → · Porto trends →
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.
Porto
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Porto, a weather station, about 13 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.
← change Castries · change Porto → · Castries page · Porto page