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Castries vs Sun Valley
Comparing Castries change · Sun Valley change
Castries is the warmer of the two — about 41°F on the annual average; Castries is the wetter, with 60 in 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 41°F on the annual average.
Precipitation
Castries is the wetter — about 60 in 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 (°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 |
| Sun Valley | 32 | 36 | 43 | 53 | 62 | 70 | 81 | 79 | 70 | 56 | 42 | 31 |
| Difference | -48 | -44 | -37 | -29 | -20 | -13 | -3 | -4 | -14 | -27 | -40 | -50 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Sun Valley | 32 | 36 | 43 | 53 | 62 | 70 |
| Difference | -48 | -44 | -37 | -29 | -20 | -13 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Sun Valley | 81 | 79 | 70 | 56 | 42 | 31 |
| Difference | -3 | -4 | -14 | -27 | -40 | -50 |
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 |
| Sun Valley | 8 | 11 | 18 | 27 | 34 | 39 | 45 | 43 | 36 | 27 | 17 | 9 |
| Difference | -70 | -67 | -59 | -52 | -46 | -42 | -37 | -39 | -46 | -55 | -64 | -70 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Sun Valley | 8 | 11 | 18 | 27 | 34 | 39 |
| Difference | -70 | -67 | -59 | -52 | -46 | -42 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Sun Valley | 45 | 43 | 36 | 27 | 17 | 9 |
| Difference | -37 | -39 | -46 | -55 | -64 | -70 |
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 |
| Sun Valley | 2.1 | 1.7 | 1.8 | 1.2 | 1.7 | 1.4 | 0.5 | 0.5 | 0.8 | 1.4 | 1.2 | 2.7 |
| Difference | -2.3 | -1.3 | -0.8 | -2.4 | -2.8 | -3.8 | -8 | -11 | -8 | -8.3 | -8.4 | -3.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Sun Valley | 2.1 | 1.7 | 1.8 | 1.2 | 1.7 | 1.4 |
| Difference | -2.3 | -1.3 | -0.8 | -2.4 | -2.8 | -3.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Sun Valley | 0.5 | 0.5 | 0.8 | 1.4 | 1.2 | 2.7 |
| Difference | -8 | -11 | -8 | -8.3 | -8.4 | -3.2 |
Snowfall (in)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — | — | — | — | — | — | — |
| Sun Valley | 28.5 | 18.3 | 10.4 | 3.7 | 0.2 | 0 | 0 | 0 | 0 | 1.7 | 10.2 | 29.7 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| Sun Valley | 28.5 | 18.3 | 10.4 | 3.7 | 0.2 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | — | — | — | — | — | — |
| Sun Valley | 0 | 0 | 0 | 1.7 | 10.2 | 29.7 |
| 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