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Zermatt vs Castries
Comparing Zermatt change · Castries change
Castries is the warmer of the two — about 23°C on the annual average; Castries is the wetter, with 1322 mm more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Zermatt and Castries, in everyday terms.
Summers
Castries has far hotter summers
Zermatt: Mild
Castries: Warm
Winters
Castries has far milder winters
Zermatt: Very cold
Castries: Stays warm
Rain & snow
Castries is much wetter
Zermatt: Moderate rainfall
Castries: Very wet
Sky
Castries is sunnier
Zermatt: Often cloudy
Castries: Fairly sunny
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 1322 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zermatt | 1 | 2 | 6 | 10 | 14 | 18 | 20 | 20 | 15 | 11 | 5 | 2 |
| Castries | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 27 |
| Difference | +26 | +25 | +21 | +18 | +14 | +11 | +8 | +9 | +13 | +17 | +23 | +26 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Zermatt | 1 | 2 | 6 | 10 | 14 | 18 |
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Difference | +26 | +25 | +21 | +18 | +14 | +11 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Zermatt | 20 | 20 | 15 | 11 | 5 | 2 |
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Difference | +8 | +9 | +13 | +17 | +23 | +26 |
Avg low (°C) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zermatt | -7 | -7 | -4 | -1 | 3 | 7 | 8 | 8 | 5 | 1 | -3 | -6 |
| Castries | 26 | 25 | 25 | 26 | 27 | 27 | 27 | 28 | 28 | 28 | 27 | 26 |
| Difference | +33 | +33 | +29 | +27 | +24 | +21 | +19 | +19 | +23 | +26 | +30 | +33 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Zermatt | -7 | -7 | -4 | -1 | 3 | 7 |
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Difference | +33 | +33 | +29 | +27 | +24 | +21 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Zermatt | 8 | 8 | 5 | 1 | -3 | -6 |
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Difference | +19 | +19 | +23 | +26 | +30 | +33 |
Precipitation (mm) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zermatt | 42 | 30 | 33 | 40 | 77 | 70 | 59 | 68 | 51 | 57 | 65 | 47 |
| Castries | 113 | 76 | 66 | 90 | 114 | 134 | 216 | 291 | 224 | 246 | 243 | 149 |
| Difference | +71 | +46 | +33 | +50 | +36 | +64 | +157 | +223 | +173 | +189 | +177 | +102 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Zermatt | 42 | 30 | 33 | 40 | 77 | 70 |
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Difference | +71 | +46 | +33 | +50 | +36 | +64 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Zermatt | 59 | 68 | 51 | 57 | 65 | 47 |
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Difference | +157 | +223 | +173 | +189 | +177 | +102 |
Cloud cover (%) Zermatt runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zermatt | 68 | 69 | 68 | 69 | 72 | 65 | 59 | 59 | 61 | 66 | 71 | 71 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -30 | -30 | -27 | -20 | -20 | -7 | -10 | -12 | -10 | -15 | -25 | -31 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Zermatt | 68 | 69 | 68 | 69 | 72 | 65 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Difference | -30 | -30 | -27 | -20 | -20 | -7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Zermatt | 59 | 59 | 61 | 66 | 71 | 71 |
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -10 | -12 | -10 | -15 | -25 | -31 |
Relative humidity (%) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zermatt | 83 | 83 | 86 | 82 | 78 | 75 | 74 | 75 | 78 | 80 | 85 | 83 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | -7 | -9 | -11 | -6 | — | +3 | +4 | +4 | +1 | -1 | -6 | -6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Zermatt | 83 | 83 | 86 | 82 | 78 | 75 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Difference | -7 | -9 | -11 | -6 | — | +3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Zermatt | 74 | 75 | 78 | 80 | 85 | 83 |
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | +4 | +4 | +1 | -1 | -6 | -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. Zermatt trends → · Castries trends →
Methodology & sources
Zermatt
Temperature & precipitation — the official 1991–2020 climate normals from a national meteorological service, measured at Zermatt, about 1 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.
← change Zermatt · change Castries → · Zermatt page · Castries page