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Zermatt vs Sun Valley
Comparing Zermatt change · Sun Valley change
Zermatt and Sun Valley have nearly identical year-round temperatures; Zermatt is the wetter, with 211 mm more rain a year, and Sun Valley the sunnier.
How the seasons compare
The differences between Zermatt and Sun Valley, in everyday terms.
Summers
Sun Valley has much hotter summers
Zermatt: Mild
Sun Valley: Warm
Winters
Zermatt has much milder winters
Zermatt: Very cold
Sun Valley: Very cold
Rain & snow
Zermatt is wetter
Zermatt: Moderate rainfall
Sun Valley: Fairly dry
Sky
Sun Valley is sunnier
Zermatt: Often cloudy
Sun Valley: Partly cloudy
Month-by-month charts
Temperature
Zermatt and Sun Valley run remarkably close all year.
Precipitation
Zermatt is the wetter — about 211 mm more across the year.
Clear skies
Sun Valley 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) Sun Valley 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 |
| Sun Valley | -0 | 2 | 6 | 12 | 17 | 21 | 27 | 26 | 21 | 14 | 6 | -0 |
| Difference | -1 | — | +1 | +2 | +3 | +3 | +7 | +7 | +6 | +2 | +1 | -2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Zermatt | 1 | 2 | 6 | 10 | 14 | 18 |
| Sun Valley | -0 | 2 | 6 | 12 | 17 | 21 |
| Difference | -1 | — | +1 | +2 | +3 | +3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Zermatt | 20 | 20 | 15 | 11 | 5 | 2 |
| Sun Valley | 27 | 26 | 21 | 14 | 6 | -0 |
| Difference | +7 | +7 | +6 | +2 | +1 | -2 |
Avg low (°C) Zermatt 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 |
| Sun Valley | -14 | -12 | -8 | -3 | 1 | 4 | 7 | 6 | 2 | -3 | -8 | -13 |
| Difference | -6 | -4 | -4 | -2 | -2 | -3 | -1 | -2 | -3 | -4 | -5 | -6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Zermatt | -7 | -7 | -4 | -1 | 3 | 7 |
| Sun Valley | -14 | -12 | -8 | -3 | 1 | 4 |
| Difference | -6 | -4 | -4 | -2 | -2 | -3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Zermatt | 8 | 8 | 5 | 1 | -3 | -6 |
| Sun Valley | 7 | 6 | 2 | -3 | -8 | -13 |
| Difference | -1 | -2 | -3 | -4 | -5 | -6 |
Precipitation (mm) Varies through 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 |
| Sun Valley | 54 | 42 | 45 | 30 | 42 | 36 | 12 | 11 | 20 | 36 | 30 | 69 |
| Difference | +12 | +13 | +12 | -10 | -35 | -34 | -47 | -57 | -31 | -20 | -35 | +21 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Zermatt | 42 | 30 | 33 | 40 | 77 | 70 |
| Sun Valley | 54 | 42 | 45 | 30 | 42 | 36 |
| Difference | +12 | +13 | +12 | -10 | -35 | -34 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Zermatt | 59 | 68 | 51 | 57 | 65 | 47 |
| Sun Valley | 12 | 11 | 20 | 36 | 30 | 69 |
| Difference | -47 | -57 | -31 | -20 | -35 | +21 |
Snowfall (cm)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zermatt | — | — | — | — | — | — | — | — | — | — | — | — |
| Sun Valley | 72 | 47 | 27 | 9 | 0 | 0 | 0 | 0 | 0 | 4 | 26 | 75 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Zermatt | — | — | — | — | — | — |
| Sun Valley | 72 | 47 | 27 | 9 | 0 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Zermatt | — | — | — | — | — | — |
| Sun Valley | 0 | 0 | 0 | 4 | 26 | 75 |
| Difference | — | — | — | — | — | — |
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 |
| Sun Valley | 59 | 61 | 64 | 63 | 61 | 50 | 35 | 35 | 39 | 48 | 58 | 61 |
| Difference | -9 | -8 | -5 | -7 | -11 | -15 | -25 | -23 | -22 | -19 | -13 | -11 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Zermatt | 68 | 69 | 68 | 69 | 72 | 65 |
| Sun Valley | 59 | 61 | 64 | 63 | 61 | 50 |
| Difference | -9 | -8 | -5 | -7 | -11 | -15 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Zermatt | 59 | 59 | 61 | 66 | 71 | 71 |
| Sun Valley | 35 | 35 | 39 | 48 | 58 | 61 |
| Difference | -25 | -23 | -22 | -19 | -13 | -11 |
Relative humidity (%) Zermatt runs higher most of 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 |
| Sun Valley | 84 | 82 | 74 | 64 | 58 | 51 | 39 | 36 | 41 | 54 | 70 | 83 |
| Difference | +1 | -1 | -13 | -18 | -20 | -25 | -36 | -39 | -37 | -26 | -15 | -1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Zermatt | 83 | 83 | 86 | 82 | 78 | 75 |
| Sun Valley | 84 | 82 | 74 | 64 | 58 | 51 |
| Difference | +1 | -1 | -13 | -18 | -20 | -25 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Zermatt | 74 | 75 | 78 | 80 | 85 | 83 |
| Sun Valley | 39 | 36 | 41 | 54 | 70 | 83 |
| Difference | -36 | -39 | -37 | -26 | -15 | -1 |
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 → · Sun Valley 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.
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 Zermatt · change Sun Valley → · Zermatt page · Sun Valley page