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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 8 in 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 8 in 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 (°F) Sun Valley runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zermatt | 33 | 35 | 42 | 50 | 57 | 64 | 68 | 67 | 60 | 52 | 41 | 35 |
| Sun Valley | 32 | 36 | 43 | 53 | 62 | 70 | 81 | 79 | 70 | 56 | 42 | 31 |
| Difference | -1 | +1 | +1 | +3 | +5 | +6 | +13 | +12 | +10 | +4 | +1 | -4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Zermatt | 33 | 35 | 42 | 50 | 57 | 64 |
| Sun Valley | 32 | 36 | 43 | 53 | 62 | 70 |
| Difference | -1 | +1 | +1 | +3 | +5 | +6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Zermatt | 68 | 67 | 60 | 52 | 41 | 35 |
| Sun Valley | 81 | 79 | 70 | 56 | 42 | 31 |
| Difference | +13 | +12 | +10 | +4 | +1 | -4 |
Avg low (°F) Zermatt runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zermatt | 19 | 19 | 25 | 31 | 38 | 44 | 47 | 47 | 41 | 35 | 26 | 21 |
| Sun Valley | 8 | 11 | 18 | 27 | 34 | 39 | 45 | 43 | 36 | 27 | 17 | 9 |
| Difference | -11 | -8 | -6 | -4 | -4 | -5 | -2 | -4 | -5 | -7 | -9 | -12 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Zermatt | 19 | 19 | 25 | 31 | 38 | 44 |
| Sun Valley | 8 | 11 | 18 | 27 | 34 | 39 |
| Difference | -11 | -8 | -6 | -4 | -4 | -5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Zermatt | 47 | 47 | 41 | 35 | 26 | 21 |
| Sun Valley | 45 | 43 | 36 | 27 | 17 | 9 |
| Difference | -2 | -4 | -5 | -7 | -9 | -12 |
Precipitation (in) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zermatt | 1.7 | 1.2 | 1.3 | 1.6 | 3 | 2.8 | 2.3 | 2.7 | 2 | 2.2 | 2.6 | 1.9 |
| Sun Valley | 2.1 | 1.7 | 1.8 | 1.2 | 1.7 | 1.4 | 0.5 | 0.5 | 0.8 | 1.4 | 1.2 | 2.7 |
| Difference | +0.5 | +0.5 | +0.5 | -0.4 | -1.4 | -1.3 | -1.8 | -2.2 | -1.2 | -0.8 | -1.4 | +0.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Zermatt | 1.7 | 1.2 | 1.3 | 1.6 | 3 | 2.8 |
| Sun Valley | 2.1 | 1.7 | 1.8 | 1.2 | 1.7 | 1.4 |
| Difference | +0.5 | +0.5 | +0.5 | -0.4 | -1.4 | -1.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Zermatt | 2.3 | 2.7 | 2 | 2.2 | 2.6 | 1.9 |
| Sun Valley | 0.5 | 0.5 | 0.8 | 1.4 | 1.2 | 2.7 |
| Difference | -1.8 | -2.2 | -1.2 | -0.8 | -1.4 | +0.8 |
Snowfall (in)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zermatt | — | — | — | — | — | — | — | — | — | — | — | — |
| Sun Valley | 28.5 | 18.3 | 10.4 | 3.7 | 0.2 | 0 | 0 | 0 | 0 | 1.7 | 10.2 | 29.7 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Zermatt | — | — | — | — | — | — |
| Sun Valley | 28.5 | 18.3 | 10.4 | 3.7 | 0.2 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Zermatt | — | — | — | — | — | — |
| Sun Valley | 0 | 0 | 0 | 1.7 | 10.2 | 29.7 |
| 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