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Castries vs Rotterdam
Comparing Castries change · Rotterdam change
Castries is the warmer of the two — about 30°F on the annual average; Castries is the wetter, with 43 in 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 30°F on the annual average.
Precipitation
Castries is the wetter — about 43 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 |
| Rotterdam | 44 | 45 | 51 | 58 | 64 | 69 | 73 | 73 | 67 | 59 | 50 | 45 |
| Difference | -37 | -35 | -30 | -24 | -19 | -14 | -10 | -11 | -17 | -25 | -32 | -37 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Rotterdam | 44 | 45 | 51 | 58 | 64 | 69 |
| Difference | -37 | -35 | -30 | -24 | -19 | -14 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Rotterdam | 73 | 73 | 67 | 59 | 50 | 45 |
| Difference | -10 | -11 | -17 | -25 | -32 | -37 |
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 |
| Rotterdam | 34 | 34 | 37 | 41 | 46 | 52 | 56 | 56 | 51 | 46 | 40 | 35 |
| Difference | -44 | -44 | -41 | -38 | -34 | -29 | -25 | -26 | -31 | -36 | -41 | -44 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Rotterdam | 34 | 34 | 37 | 41 | 46 | 52 |
| Difference | -44 | -44 | -41 | -38 | -34 | -29 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Rotterdam | 56 | 56 | 51 | 46 | 40 | 35 |
| Difference | -25 | -26 | -31 | -36 | -41 | -44 |
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 |
| Rotterdam | 2.8 | 2.6 | 2.2 | 1.7 | 2.2 | 2.8 | 3.1 | 3.5 | 3.6 | 3.4 | 3.4 | 3.4 |
| Difference | -1.7 | -0.4 | -0.4 | -1.8 | -2.3 | -2.5 | -5.4 | -7.9 | -5.3 | -6.3 | -6.1 | -2.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Rotterdam | 2.8 | 2.6 | 2.2 | 1.7 | 2.2 | 2.8 |
| Difference | -1.7 | -0.4 | -0.4 | -1.8 | -2.3 | -2.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Rotterdam | 3.1 | 3.5 | 3.6 | 3.4 | 3.4 | 3.4 |
| Difference | -5.4 | -7.9 | -5.3 | -6.3 | -6.1 | -2.5 |
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.
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