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Castries vs Sun Valley
Comparing Castries change · Sun Valley change
Castries is the warmer of the two — about 23°C on the annual average; Castries is the wetter, with 1533 mm more rain a year.
How the seasons compare
The differences between Castries and Sun Valley, in everyday terms.
Summers
Castries has hotter summers
Castries: Warm
Sun Valley: Warm
Winters
Castries has far milder winters
Castries: Stays warm
Sun Valley: Very cold
Rain & snow
Castries is much wetter
Castries: Very wet
Sun Valley: Fairly dry
Sky
Similar amounts of sun
Castries: Fairly sunny
Sun Valley: Partly cloudy
Month-by-month charts
Temperature
Castries is the warmer of the two — about 23°C on the annual average.
Precipitation
Castries is the wetter — about 1533 mm more across the year.
Clear skies
The two cities see a similar amount of sun.
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 |
| Sun Valley | -0 | 2 | 6 | 12 | 17 | 21 | 27 | 26 | 21 | 14 | 6 | -0 |
| Difference | -27 | -25 | -21 | -16 | -11 | -7 | -1 | -2 | -8 | -15 | -22 | -28 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Sun Valley | -0 | 2 | 6 | 12 | 17 | 21 |
| Difference | -27 | -25 | -21 | -16 | -11 | -7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Sun Valley | 27 | 26 | 21 | 14 | 6 | -0 |
| Difference | -1 | -2 | -8 | -15 | -22 | -28 |
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 |
| Sun Valley | -14 | -12 | -8 | -3 | 1 | 4 | 7 | 6 | 2 | -3 | -8 | -13 |
| Difference | -39 | -37 | -33 | -29 | -26 | -23 | -20 | -22 | -26 | -30 | -35 | -39 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Sun Valley | -14 | -12 | -8 | -3 | 1 | 4 |
| Difference | -39 | -37 | -33 | -29 | -26 | -23 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Sun Valley | 7 | 6 | 2 | -3 | -8 | -13 |
| Difference | -20 | -22 | -26 | -30 | -35 | -39 |
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 |
| Sun Valley | 54 | 42 | 45 | 30 | 42 | 36 | 12 | 11 | 20 | 36 | 30 | 69 |
| Difference | -59 | -33 | -21 | -60 | -71 | -98 | -204 | -280 | -204 | -210 | -212 | -81 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Sun Valley | 54 | 42 | 45 | 30 | 42 | 36 |
| Difference | -59 | -33 | -21 | -60 | -71 | -98 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Sun Valley | 12 | 11 | 20 | 36 | 30 | 69 |
| Difference | -204 | -280 | -204 | -210 | -212 | -81 |
Snowfall (cm)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — | — | — | — | — | — | — |
| Sun Valley | 72 | 47 | 27 | 9 | 0 | 0 | 0 | 0 | 0 | 4 | 26 | 75 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| Sun Valley | 72 | 47 | 27 | 9 | 0 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| Sun Valley | 0 | 0 | 0 | 4 | 26 | 75 |
| Difference | — | — | — | — | — | — |
Cloud cover (%) Varies through 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 |
| Sun Valley | 59 | 61 | 64 | 63 | 61 | 50 | 35 | 35 | 39 | 48 | 58 | 61 |
| Difference | +20 | +22 | +22 | +13 | +9 | -9 | -15 | -11 | -12 | -4 | +12 | +20 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Sun Valley | 59 | 61 | 64 | 63 | 61 | 50 |
| Difference | +20 | +22 | +22 | +13 | +9 | -9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Sun Valley | 35 | 35 | 39 | 48 | 58 | 61 |
| Difference | -15 | -11 | -12 | -4 | +12 | +20 |
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 |
| Sun Valley | 84 | 82 | 74 | 64 | 58 | 51 | 39 | 36 | 41 | 54 | 70 | 83 |
| Difference | +8 | +8 | -1 | -12 | -19 | -28 | -40 | -43 | -38 | -26 | -9 | +6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Sun Valley | 84 | 82 | 74 | 64 | 58 | 51 |
| Difference | +8 | +8 | -1 | -12 | -19 | -28 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Sun Valley | 39 | 36 | 41 | 54 | 70 | 83 |
| Difference | -40 | -43 | -38 | -26 | -9 | +6 |
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 → · Sun Valley trends →
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.
Sun Valley
Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Ketchum RS, 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 Sun Valley → · Castries page · Sun Valley page