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Reykjavík vs Sun Valley
Comparing Reykjavík change · Sun Valley change
Reykjavík and Sun Valley have nearly identical year-round temperatures; Reykjavík is the wetter, with 36 in more rain a year, and Sun Valley the sunnier.
How the seasons compare
The differences between Reykjavík and Sun Valley, in everyday terms.
Summers
Sun Valley has far hotter summers
Reykjavík: Cool
Sun Valley: Warm
Winters
Reykjavík has much milder winters
Reykjavík: Cold
Sun Valley: Very cold
Rain & snow
Reykjavík is much wetter
Reykjavík: Wet
Sun Valley: Fairly dry
Sky
Sun Valley is far sunnier
Reykjavík: Often grey
Sun Valley: Partly cloudy
Month-by-month charts
Temperature
Reykjavík and Sun Valley run remarkably close all year.
Precipitation
Reykjavík is the wetter — about 36 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 38 | 37 | 38 | 44 | 49 | 54 | 57 | 56 | 52 | 45 | 40 | 38 |
| Sun Valley | 32 | 36 | 43 | 53 | 62 | 70 | 81 | 79 | 70 | 56 | 42 | 31 |
| Difference | -6 | -2 | +5 | +9 | +14 | +16 | +24 | +23 | +18 | +11 | +2 | -7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 38 | 37 | 38 | 44 | 49 | 54 |
| Sun Valley | 32 | 36 | 43 | 53 | 62 | 70 |
| Difference | -6 | -2 | +5 | +9 | +14 | +16 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 57 | 56 | 52 | 45 | 40 | 38 |
| Sun Valley | 81 | 79 | 70 | 56 | 42 | 31 |
| Difference | +24 | +23 | +18 | +11 | +2 | -7 |
Avg low (°F) Reykjavík runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 29 | 28 | 29 | 34 | 39 | 44 | 47 | 47 | 43 | 37 | 32 | 31 |
| Sun Valley | 8 | 11 | 18 | 27 | 34 | 39 | 45 | 43 | 36 | 27 | 17 | 9 |
| Difference | -22 | -17 | -11 | -7 | -5 | -5 | -3 | -4 | -8 | -10 | -15 | -22 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 29 | 28 | 29 | 34 | 39 | 44 |
| Sun Valley | 8 | 11 | 18 | 27 | 34 | 39 |
| Difference | -22 | -17 | -11 | -7 | -5 | -5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 47 | 47 | 43 | 37 | 32 | 31 |
| Sun Valley | 45 | 43 | 36 | 27 | 17 | 9 |
| Difference | -3 | -4 | -8 | -10 | -15 | -22 |
Precipitation (in) Reykjavík runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 5.2 | 5 | 4.3 | 3 | 3.7 | 2 | 3.8 | 5.3 | 5 | 4.5 | 5.9 | 4.9 |
| 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 | -3.1 | -3.3 | -2.5 | -1.8 | -2 | -0.6 | -3.3 | -4.8 | -4.2 | -3.1 | -4.7 | -2.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 5.2 | 5 | 4.3 | 3 | 3.7 | 2 |
| Sun Valley | 2.1 | 1.7 | 1.8 | 1.2 | 1.7 | 1.4 |
| Difference | -3.1 | -3.3 | -2.5 | -1.8 | -2 | -0.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 3.8 | 5.3 | 5 | 4.5 | 5.9 | 4.9 |
| Sun Valley | 0.5 | 0.5 | 0.8 | 1.4 | 1.2 | 2.7 |
| Difference | -3.3 | -4.8 | -4.2 | -3.1 | -4.7 | -2.2 |
Snowfall (in) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 10.8 | 15.8 | 11.4 | 4.6 | 0.4 | 0 | 0 | 0 | 0 | 0.4 | 8.2 | 11.9 |
| Sun Valley | 28.5 | 18.3 | 10.4 | 3.7 | 0.2 | 0 | 0 | 0 | 0 | 1.7 | 10.2 | 29.7 |
| Difference | +17.6 | +2.6 | -1 | -0.9 | -0.2 | — | — | — | — | +1.3 | +2 | +17.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 10.8 | 15.8 | 11.4 | 4.6 | 0.4 | 0 |
| Sun Valley | 28.5 | 18.3 | 10.4 | 3.7 | 0.2 | 0 |
| Difference | +17.6 | +2.6 | -1 | -0.9 | -0.2 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 0 | 0 | 0 | 0.4 | 8.2 | 11.9 |
| Sun Valley | 0 | 0 | 0 | 1.7 | 10.2 | 29.7 |
| Difference | — | — | — | +1.3 | +2 | +17.7 |
Cloud cover (%) Reykjavík runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 85 | 82 | 82 | 79 | 76 | 79 | 81 | 79 | 79 | 78 | 82 | 84 |
| Sun Valley | 59 | 61 | 64 | 63 | 61 | 50 | 35 | 35 | 39 | 48 | 58 | 61 |
| Difference | -26 | -22 | -18 | -16 | -15 | -30 | -47 | -44 | -40 | -30 | -23 | -24 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 85 | 82 | 82 | 79 | 76 | 79 |
| Sun Valley | 59 | 61 | 64 | 63 | 61 | 50 |
| Difference | -26 | -22 | -18 | -16 | -15 | -30 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 81 | 79 | 79 | 78 | 82 | 84 |
| Sun Valley | 35 | 35 | 39 | 48 | 58 | 61 |
| Difference | -47 | -44 | -40 | -30 | -23 | -24 |
Relative humidity (%) Reykjavík runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 88 | 87 | 86 | 84 | 83 | 83 | 85 | 86 | 86 | 88 | 88 | 88 |
| Sun Valley | 84 | 82 | 74 | 64 | 58 | 51 | 39 | 36 | 41 | 54 | 70 | 83 |
| Difference | -4 | -5 | -13 | -20 | -25 | -33 | -46 | -50 | -45 | -34 | -18 | -5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 88 | 87 | 86 | 84 | 83 | 83 |
| Sun Valley | 84 | 82 | 74 | 64 | 58 | 51 |
| Difference | -4 | -5 | -13 | -20 | -25 | -33 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 85 | 86 | 86 | 88 | 88 | 88 |
| Sun Valley | 39 | 36 | 41 | 54 | 70 | 83 |
| Difference | -46 | -50 | -45 | -34 | -18 | -5 |
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. Reykjavík trends → · Sun Valley trends →
Methodology & sources
Reykjavík
Temperature & precipitation — 1991–2020 normals computed from 11 years of daily observations at Keflavik, a weather station, about 39 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.
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 Reykjavík · change Sun Valley → · Reykjavík page · Sun Valley page