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Jeju City vs Castries
Comparing Jeju City change · Castries change
Castries is the warmer of the two — about 11°C on the annual average; Castries is the wetter, with 359 mm more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Jeju City and Castries, in everyday terms.
Summers
Summers are nearly the same
Jeju City: Warm
Castries: Warm
Winters
Castries has far milder winters
Jeju City: Chilly
Castries: Stays warm
Rain & snow
Castries is wetter
Jeju City: Very wet
Castries: Very wet
Sky
Castries is far sunnier
Jeju City: Often cloudy
Castries: Fairly sunny
Month-by-month charts
Temperature
Castries is the warmer of the two — about 11°C on the annual average.
Precipitation
Castries is the wetter — about 359 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jeju City | 8 | 10 | 13 | 18 | 22 | 25 | 29 | 30 | 26 | 22 | 16 | 11 |
| Castries | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 27 |
| Difference | +18 | +17 | +14 | +10 | +6 | +4 | -1 | -1 | +3 | +7 | +12 | +17 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Jeju City | 8 | 10 | 13 | 18 | 22 | 25 |
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Difference | +18 | +17 | +14 | +10 | +6 | +4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Jeju City | 29 | 30 | 26 | 22 | 16 | 11 |
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Difference | -1 | -1 | +3 | +7 | +12 | +17 |
Avg low (°C) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jeju City | 3 | 4 | 6 | 10 | 15 | 19 | 23 | 25 | 21 | 15 | 10 | 5 |
| Castries | 26 | 25 | 25 | 26 | 27 | 27 | 27 | 28 | 28 | 28 | 27 | 26 |
| Difference | +22 | +22 | +19 | +16 | +12 | +8 | +4 | +3 | +7 | +12 | +17 | +21 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Jeju City | 3 | 4 | 6 | 10 | 15 | 19 |
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Difference | +22 | +22 | +19 | +16 | +12 | +8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Jeju City | 23 | 25 | 21 | 15 | 10 | 5 |
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Difference | +4 | +3 | +7 | +12 | +17 | +21 |
Precipitation (mm) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jeju City | 68 | 60 | 92 | 90 | 103 | 183 | 218 | 314 | 245 | 99 | 74 | 56 |
| Castries | 113 | 76 | 66 | 90 | 114 | 134 | 216 | 291 | 224 | 246 | 243 | 149 |
| Difference | +45 | +16 | -26 | -1 | +11 | -50 | -2 | -23 | -21 | +147 | +168 | +94 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Jeju City | 68 | 60 | 92 | 90 | 103 | 183 |
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Difference | +45 | +16 | -26 | -1 | +11 | -50 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Jeju City | 218 | 314 | 245 | 99 | 74 | 56 |
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Difference | -2 | -23 | -21 | +147 | +168 | +94 |
Cloud cover (%) Jeju City runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jeju City | 79 | 75 | 72 | 72 | 74 | 81 | 73 | 65 | 66 | 58 | 65 | 75 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -41 | -36 | -30 | -22 | -22 | -22 | -23 | -19 | -15 | -6 | -19 | -34 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Jeju City | 79 | 75 | 72 | 72 | 74 | 81 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Difference | -41 | -36 | -30 | -22 | -22 | -22 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Jeju City | 73 | 65 | 66 | 58 | 65 | 75 |
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -23 | -19 | -15 | -6 | -19 | -34 |
Relative humidity (%) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jeju City | 77 | 75 | 74 | 79 | 85 | 89 | 90 | 85 | 80 | 74 | 74 | 76 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | -1 | — | +1 | -3 | -8 | -10 | -12 | -6 | -1 | +5 | +5 | +1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Jeju City | 77 | 75 | 74 | 79 | 85 | 89 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Difference | -1 | — | +1 | -3 | -8 | -10 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Jeju City | 90 | 85 | 80 | 74 | 74 | 76 |
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | -12 | -6 | -1 | +5 | +5 | +1 |
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. Jeju City trends → · Castries trends →
Methodology & sources
Jeju City
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Jeju, a weather station, about 1 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.
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.
← change Jeju City · change Castries → · Jeju City page · Castries page