Home › Compare › Castries vs Riyadh
Castries vs Riyadh
Comparing Castries change · Riyadh change
Castries and Riyadh have nearly identical year-round temperatures; Castries is the wetter, with 1817 mm more rain a year, and Riyadh the sunnier.
How the seasons compare
The differences between Castries and Riyadh, in everyday terms.
Summers
Riyadh has far hotter summers
Castries: Warm
Riyadh: Extreme heat
Winters
Castries has far milder winters
Castries: Stays warm
Riyadh: Cool
Rain & snow
Castries is much wetter
Castries: Very wet
Riyadh: Very dry
Sky
Riyadh is sunnier
Castries: Fairly sunny
Riyadh: Sunny
Month-by-month charts
Temperature
Castries and Riyadh run remarkably close all year.
Precipitation
Castries is the wetter — about 1817 mm more across the year.
Clear skies
Riyadh 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) Varies through 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 |
| Riyadh | 20 | 24 | 28 | 34 | 39 | 43 | 43 | 44 | 40 | 35 | 28 | 22 |
| Difference | -7 | -3 | +1 | +6 | +11 | +14 | +15 | +15 | +12 | +7 | -1 | -5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Riyadh | 20 | 24 | 28 | 34 | 39 | 43 |
| Difference | -7 | -3 | +1 | +6 | +11 | +14 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Riyadh | 43 | 44 | 40 | 35 | 28 | 22 |
| Difference | +15 | +15 | +12 | +7 | -1 | -5 |
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 |
| Riyadh | 9 | 11 | 15 | 21 | 26 | 28 | 29 | 29 | 26 | 21 | 15 | 11 |
| Difference | -17 | -14 | -10 | -5 | -1 | +1 | +2 | +2 | -2 | -6 | -12 | -16 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Riyadh | 9 | 11 | 15 | 21 | 26 | 28 |
| Difference | -17 | -14 | -10 | -5 | -1 | +1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Riyadh | 29 | 29 | 26 | 21 | 15 | 11 |
| Difference | +2 | +2 | -2 | -6 | -12 | -16 |
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 |
| Riyadh | 23 | 5 | 43 | 32 | 11 | 0 | 0 | 1 | 0 | 2 | 14 | 14 |
| Difference | -90 | -71 | -23 | -57 | -103 | -134 | -216 | -291 | -224 | -244 | -229 | -135 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Riyadh | 23 | 5 | 43 | 32 | 11 | 0 |
| Difference | -90 | -71 | -23 | -57 | -103 | -134 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Riyadh | 0 | 1 | 0 | 2 | 14 | 14 |
| Difference | -216 | -291 | -224 | -244 | -229 | -135 |
Cloud cover (%) Castries 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 |
| Riyadh | 32 | 30 | 38 | 45 | 34 | 15 | 23 | 21 | 16 | 15 | 27 | 27 |
| Difference | -7 | -9 | -4 | -4 | -18 | -44 | -26 | -25 | -35 | -36 | -19 | -13 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Riyadh | 32 | 30 | 38 | 45 | 34 | 15 |
| Difference | -7 | -9 | -4 | -4 | -18 | -44 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Riyadh | 23 | 21 | 16 | 15 | 27 | 27 |
| Difference | -26 | -25 | -35 | -36 | -19 | -13 |
Relative humidity (%) Castries 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 |
| Riyadh | 42 | 34 | 29 | 25 | 17 | 11 | 12 | 14 | 15 | 21 | 36 | 44 |
| Difference | -33 | -41 | -45 | -51 | -61 | -67 | -67 | -65 | -63 | -58 | -43 | -33 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Riyadh | 42 | 34 | 29 | 25 | 17 | 11 |
| Difference | -33 | -41 | -45 | -51 | -61 | -67 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Riyadh | 12 | 14 | 15 | 21 | 36 | 44 |
| Difference | -67 | -65 | -63 | -58 | -43 | -33 |
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 → · Riyadh 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.
Riyadh
Temperature & precipitation — 1991–2020 normals computed from 20 years of daily observations at Riyadh Obs. (o.a.p., a weather station, about 2 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 Riyadh → · Castries page · Riyadh page