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 72 in 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 72 in 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 (°F) Varies through 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 |
| Riyadh | 68 | 75 | 82 | 93 | 103 | 109 | 110 | 111 | 105 | 95 | 82 | 72 |
| Difference | -12 | -5 | +2 | +11 | +20 | +26 | +27 | +27 | +21 | +12 | -1 | -9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Riyadh | 68 | 75 | 82 | 93 | 103 | 109 |
| Difference | -12 | -5 | +2 | +11 | +20 | +26 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Riyadh | 110 | 111 | 105 | 95 | 82 | 72 |
| Difference | +27 | +27 | +21 | +12 | -1 | -9 |
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 |
| Riyadh | 48 | 52 | 59 | 69 | 79 | 83 | 85 | 85 | 79 | 70 | 60 | 51 |
| Difference | -30 | -25 | -19 | -10 | -1 | +2 | +4 | +3 | -3 | -11 | -21 | -28 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Riyadh | 48 | 52 | 59 | 69 | 79 | 83 |
| Difference | -30 | -25 | -19 | -10 | -1 | +2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Riyadh | 85 | 85 | 79 | 70 | 60 | 51 |
| Difference | +4 | +3 | -3 | -11 | -21 | -28 |
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 |
| Riyadh | 0.9 | 0.2 | 1.7 | 1.3 | 0.4 | 0 | 0 | 0 | 0 | 0.1 | 0.6 | 0.6 |
| Difference | -3.6 | -2.8 | -0.9 | -2.3 | -4.1 | -5.3 | -8.5 | -11.4 | -8.8 | -9.6 | -9 | -5.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Riyadh | 0.9 | 0.2 | 1.7 | 1.3 | 0.4 | 0 |
| Difference | -3.6 | -2.8 | -0.9 | -2.3 | -4.1 | -5.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Riyadh | 0 | 0 | 0 | 0.1 | 0.6 | 0.6 |
| Difference | -8.5 | -11.4 | -8.8 | -9.6 | -9 | -5.3 |
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