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Castries vs Rotterdam
Comparing Castries change · Rotterdam change
Castries is the warmer of the two — about 17°C on the annual average; Castries is the wetter, with 1081 mm more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Castries and Rotterdam, in everyday terms.
Summers
Castries has much hotter summers
Castries: Warm
Rotterdam: Mild
Winters
Castries has far milder winters
Castries: Stays warm
Rotterdam: Chilly
Rain & snow
Castries is much wetter
Castries: Very wet
Rotterdam: Moderate rainfall
Sky
Castries is sunnier
Castries: Fairly sunny
Rotterdam: Often cloudy
Month-by-month charts
Temperature
Castries is the warmer of the two — about 17°C on the annual average.
Precipitation
Castries is the wetter — about 1081 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 |
| Rotterdam | 6 | 7 | 10 | 14 | 18 | 21 | 23 | 23 | 19 | 15 | 10 | 7 |
| Difference | -20 | -19 | -17 | -13 | -10 | -8 | -6 | -6 | -10 | -14 | -18 | -20 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Rotterdam | 6 | 7 | 10 | 14 | 18 | 21 |
| Difference | -20 | -19 | -17 | -13 | -10 | -8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Rotterdam | 23 | 23 | 19 | 15 | 10 | 7 |
| Difference | -6 | -6 | -10 | -14 | -18 | -20 |
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 |
| Rotterdam | 1 | 1 | 3 | 5 | 8 | 11 | 13 | 13 | 11 | 8 | 4 | 2 |
| Difference | -24 | -24 | -23 | -21 | -19 | -16 | -14 | -14 | -17 | -20 | -23 | -24 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Rotterdam | 1 | 1 | 3 | 5 | 8 | 11 |
| Difference | -24 | -24 | -23 | -21 | -19 | -16 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Rotterdam | 13 | 13 | 11 | 8 | 4 | 2 |
| Difference | -14 | -14 | -17 | -20 | -23 | -24 |
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 |
| Rotterdam | 70 | 65 | 56 | 44 | 56 | 70 | 80 | 90 | 90 | 86 | 87 | 86 |
| Difference | -43 | -11 | -10 | -46 | -58 | -64 | -136 | -201 | -134 | -160 | -156 | -63 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Rotterdam | 70 | 65 | 56 | 44 | 56 | 70 |
| Difference | -43 | -11 | -10 | -46 | -58 | -64 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Rotterdam | 80 | 90 | 90 | 86 | 87 | 86 |
| Difference | -136 | -201 | -134 | -160 | -156 | -63 |
Cloud cover (%) Rotterdam 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 |
| Rotterdam | 71 | 71 | 69 | 66 | 68 | 69 | 66 | 66 | 65 | 69 | 72 | 72 |
| Difference | +32 | +32 | +27 | +17 | +16 | +10 | +16 | +19 | +14 | +18 | +26 | +31 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Rotterdam | 71 | 71 | 69 | 66 | 68 | 69 |
| Difference | +32 | +32 | +27 | +17 | +16 | +10 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Rotterdam | 66 | 66 | 65 | 69 | 72 | 72 |
| Difference | +16 | +19 | +14 | +18 | +26 | +31 |
Relative humidity (%) Rotterdam runs higher most of 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 |
| Rotterdam | 91 | 89 | 87 | 82 | 80 | 79 | 78 | 78 | 80 | 84 | 89 | 91 |
| Difference | +15 | +15 | +12 | +6 | +3 | +1 | — | -1 | +2 | +5 | +10 | +14 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Rotterdam | 91 | 89 | 87 | 82 | 80 | 79 |
| Difference | +15 | +15 | +12 | +6 | +3 | +1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Rotterdam | 78 | 78 | 80 | 84 | 89 | 91 |
| Difference | — | -1 | +2 | +5 | +10 | +14 |
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 → · Rotterdam 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.
Rotterdam
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Rotterdam, a weather station, about 5 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 Rotterdam → · Castries page · Rotterdam page