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St. Moritz vs Castries
Comparing St. Moritz change · Castries change
Castries is the warmer of the two — about 45°F on the annual average; Castries is the wetter, with 49 in more rain a year, and Castries the sunnier.
How the seasons compare
The differences between St. Moritz and Castries, in everyday terms.
Summers
Castries has far hotter summers
St. Moritz: Mild
Castries: Warm
Winters
Castries has far milder winters
St. Moritz: Bitterly cold
Castries: Stays warm
Rain & snow
Castries is much wetter
St. Moritz: Moderate rainfall
Castries: Very wet
Sky
Castries is sunnier
St. Moritz: Often cloudy
Castries: Fairly sunny
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 49 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| St. Moritz | 30 | 33 | 39 | 46 | 55 | 63 | 67 | 66 | 58 | 51 | 39 | 31 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | +51 | +47 | +41 | +35 | +27 | +20 | +17 | +18 | +26 | +33 | +43 | +51 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| St. Moritz | 30 | 33 | 39 | 46 | 55 | 63 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Difference | +51 | +47 | +41 | +35 | +27 | +20 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| St. Moritz | 67 | 66 | 58 | 51 | 39 | 31 |
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | +17 | +18 | +26 | +33 | +43 | +51 |
Avg low (°F) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| St. Moritz | 4 | 4 | 15 | 24 | 32 | 38 | 40 | 40 | 34 | 27 | 18 | 8 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +74 | +74 | +63 | +55 | +48 | +43 | +41 | +41 | +48 | +54 | +63 | +71 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| St. Moritz | 4 | 4 | 15 | 24 | 32 | 38 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Difference | +74 | +74 | +63 | +55 | +48 | +43 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| St. Moritz | 40 | 40 | 34 | 27 | 18 | 8 |
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +41 | +41 | +48 | +54 | +63 | +71 |
Precipitation (in) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| St. Moritz | 1.2 | 0.7 | 0.9 | 1.5 | 2.6 | 3.6 | 3.4 | 4 | 2.9 | 3 | 2.7 | 1.4 |
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Difference | +3.3 | +2.2 | +1.7 | +2.1 | +1.8 | +1.7 | +5.1 | +7.5 | +5.9 | +6.7 | +6.8 | +4.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| St. Moritz | 1.2 | 0.7 | 0.9 | 1.5 | 2.6 | 3.6 |
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Difference | +3.3 | +2.2 | +1.7 | +2.1 | +1.8 | +1.7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| St. Moritz | 3.4 | 4 | 2.9 | 3 | 2.7 | 1.4 |
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Difference | +5.1 | +7.5 | +5.9 | +6.7 | +6.8 | +4.4 |
Cloud cover (%) St. Moritz runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| St. Moritz | 68 | 70 | 72 | 75 | 75 | 69 | 62 | 61 | 63 | 65 | 70 | 70 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -29 | -31 | -30 | -25 | -23 | -11 | -12 | -15 | -13 | -14 | -24 | -29 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| St. Moritz | 68 | 70 | 72 | 75 | 75 | 69 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Difference | -29 | -31 | -30 | -25 | -23 | -11 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| St. Moritz | 62 | 61 | 63 | 65 | 70 | 70 |
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -12 | -15 | -13 | -14 | -24 | -29 |
Relative humidity (%) St. Moritz runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| St. Moritz | 86 | 88 | 90 | 84 | 79 | 77 | 77 | 78 | 81 | 83 | 88 | 87 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | -11 | -13 | -15 | -8 | -2 | +1 | +2 | +1 | -2 | -4 | -9 | -10 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| St. Moritz | 86 | 88 | 90 | 84 | 79 | 77 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Difference | -11 | -13 | -15 | -8 | -2 | +1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| St. Moritz | 77 | 78 | 81 | 83 | 88 | 87 |
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | +2 | +1 | -2 | -4 | -9 | -10 |
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. St. Moritz trends → · Castries trends →
Methodology & sources
St. Moritz
Temperature & precipitation — the official 1991–2020 climate normals from a national meteorological service, measured at Samedan, about 4 km from the city centre.
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.
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.
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