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Castries vs Big Sky
Comparing Castries change · Big Sky change
Castries is the warmer of the two — about 45°F on the annual average; Castries is the wetter, with 53 in 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 45°F on the annual average.
Precipitation
Castries is the wetter — about 53 in 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 (°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 |
| Big Sky | 28 | 33 | 44 | 51 | 60 | 70 | 82 | 80 | 69 | 52 | 37 | 27 |
| Difference | -52 | -47 | -37 | -31 | -23 | -13 | -1 | -4 | -15 | -32 | -45 | -54 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Big Sky | 28 | 33 | 44 | 51 | 60 | 70 |
| Difference | -52 | -47 | -37 | -31 | -23 | -13 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Big Sky | 82 | 80 | 69 | 52 | 37 | 27 |
| Difference | -1 | -4 | -15 | -32 | -45 | -54 |
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 |
| Big Sky | 3 | 4 | 12 | 20 | 28 | 34 | 39 | 36 | 29 | 22 | 12 | 3 |
| Difference | -75 | -74 | -66 | -58 | -52 | -47 | -42 | -46 | -53 | -60 | -69 | -77 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Big Sky | 3 | 4 | 12 | 20 | 28 | 34 |
| Difference | -75 | -74 | -66 | -58 | -52 | -47 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Big Sky | 39 | 36 | 29 | 22 | 12 | 3 |
| Difference | -42 | -46 | -53 | -60 | -69 | -77 |
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 |
| Big Sky | 2.4 | 2.4 | 2.2 | 2.4 | 2.5 | 2 | 1.1 | 1.1 | 1.3 | 1.9 | 2.5 | 2.8 |
| Difference | -2 | -0.6 | -0.4 | -1.1 | -2 | -3.3 | -7.4 | -10.4 | -7.5 | -7.8 | -7.1 | -3.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Big Sky | 2.4 | 2.4 | 2.2 | 2.4 | 2.5 | 2 |
| Difference | -2 | -0.6 | -0.4 | -1.1 | -2 | -3.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Big Sky | 1.1 | 1.1 | 1.3 | 1.9 | 2.5 | 2.8 |
| Difference | -7.4 | -10.4 | -7.5 | -7.8 | -7.1 | -3.1 |
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