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Castries vs Big Sky
Comparing Castries change · Big Sky change
Castries is the warmer of the two — about 25°C on the annual average; Castries is the wetter, with 1342 mm more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Castries and Big Sky, in everyday terms.
Summers
Summers are nearly the same
Castries: Warm
Big Sky: Warm
Winters
Castries has far milder winters
Castries: Stays warm
Big Sky: Bitterly cold
Rain & snow
Castries is much wetter
Castries: Very wet
Big Sky: Moderate rainfall
Sky
Castries is sunnier
Castries: Fairly sunny
Big Sky: Partly cloudy
Month-by-month charts
Temperature
Castries is the warmer of the two — about 25°C on the annual average.
Precipitation
Castries is the wetter — about 1342 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Castries | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 27 |
| Big Sky | -2 | 1 | 7 | 11 | 16 | 21 | 28 | 27 | 20 | 11 | 3 | -3 |
| Difference | -29 | -26 | -20 | -17 | -13 | -7 | -1 | -2 | -8 | -18 | -25 | -30 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Big Sky | -2 | 1 | 7 | 11 | 16 | 21 |
| Difference | -29 | -26 | -20 | -17 | -13 | -7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Big Sky | 28 | 27 | 20 | 11 | 3 | -3 |
| Difference | -1 | -2 | -8 | -18 | -25 | -30 |
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 |
| Big Sky | -16 | -16 | -11 | -6 | -2 | 1 | 4 | 2 | -2 | -6 | -11 | -16 |
| Difference | -42 | -41 | -37 | -32 | -29 | -26 | -23 | -25 | -29 | -33 | -38 | -43 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Big Sky | -16 | -16 | -11 | -6 | -2 | 1 |
| Difference | -42 | -41 | -37 | -32 | -29 | -26 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Big Sky | 4 | 2 | -2 | -6 | -11 | -16 |
| Difference | -23 | -25 | -29 | -33 | -38 | -43 |
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 |
| Big Sky | 62 | 60 | 55 | 62 | 63 | 50 | 27 | 27 | 33 | 48 | 63 | 70 |
| Difference | -52 | -16 | -11 | -28 | -51 | -83 | -189 | -264 | -191 | -199 | -180 | -79 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Big Sky | 62 | 60 | 55 | 62 | 63 | 50 |
| Difference | -52 | -16 | -11 | -28 | -51 | -83 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Big Sky | 27 | 27 | 33 | 48 | 63 | 70 |
| Difference | -189 | -264 | -191 | -199 | -180 | -79 |
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 |
| Big Sky | 67 | 67 | 71 | 71 | 68 | 58 | 41 | 42 | 46 | 58 | 67 | 68 |
| Difference | +29 | +29 | +29 | +22 | +16 | -1 | -9 | -4 | -5 | +7 | +21 | +28 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Big Sky | 67 | 67 | 71 | 71 | 68 | 58 |
| Difference | +29 | +29 | +29 | +22 | +16 | -1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Big Sky | 41 | 42 | 46 | 58 | 67 | 68 |
| Difference | -9 | -4 | -5 | +7 | +21 | +28 |
Relative humidity (%) Varies through 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 |
| Big Sky | 99 | 99 | 95 | 83 | 73 | 67 | 55 | 49 | 54 | 68 | 87 | 98 |
| Difference | +23 | +24 | +20 | +7 | -5 | -12 | -24 | -30 | -24 | -11 | +8 | +21 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Big Sky | 99 | 99 | 95 | 83 | 73 | 67 |
| Difference | +23 | +24 | +20 | +7 | -5 | -12 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Big Sky | 55 | 49 | 54 | 68 | 87 | 98 |
| Difference | -24 | -30 | -24 | -11 | +8 | +21 |
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 → · Big Sky 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.
Big Sky
Temperature & precipitation — 1991–2020 normals computed from 22 years of daily observations at West Yellowstone, a weather station, about 73 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 Big Sky → · Castries page · Big Sky page