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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 903 mm 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 903 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 3 | 3 | 4 | 6 | 9 | 12 | 14 | 13 | 11 | 7 | 5 | 4 |
| Sun Valley | -0 | 2 | 6 | 12 | 17 | 21 | 27 | 26 | 21 | 14 | 6 | -0 |
| Difference | -3 | -1 | +3 | +5 | +8 | +9 | +13 | +13 | +10 | +6 | +1 | -4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 3 | 3 | 4 | 6 | 9 | 12 |
| Sun Valley | -0 | 2 | 6 | 12 | 17 | 21 |
| Difference | -3 | -1 | +3 | +5 | +8 | +9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 14 | 13 | 11 | 7 | 5 | 4 |
| Sun Valley | 27 | 26 | 21 | 14 | 6 | -0 |
| Difference | +13 | +13 | +10 | +6 | +1 | -4 |
Avg low (°C) Reykjavík runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | -1 | -2 | -2 | 1 | 4 | 7 | 9 | 9 | 6 | 3 | 0 | -1 |
| Sun Valley | -14 | -12 | -8 | -3 | 1 | 4 | 7 | 6 | 2 | -3 | -8 | -13 |
| Difference | -12 | -9 | -6 | -4 | -3 | -3 | -2 | -2 | -4 | -5 | -8 | -12 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | -1 | -2 | -2 | 1 | 4 | 7 |
| Sun Valley | -14 | -12 | -8 | -3 | 1 | 4 |
| Difference | -12 | -9 | -6 | -4 | -3 | -3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 9 | 9 | 6 | 3 | 0 | -1 |
| Sun Valley | 7 | 6 | 2 | -3 | -8 | -13 |
| Difference | -2 | -2 | -4 | -5 | -8 | -12 |
Precipitation (mm) Reykjavík runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 133 | 127 | 109 | 75 | 93 | 50 | 95 | 135 | 128 | 114 | 149 | 123 |
| Sun Valley | 54 | 42 | 45 | 30 | 42 | 36 | 12 | 11 | 20 | 36 | 30 | 69 |
| Difference | -79 | -84 | -64 | -46 | -50 | -14 | -83 | -123 | -107 | -78 | -119 | -55 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 133 | 127 | 109 | 75 | 93 | 50 |
| Sun Valley | 54 | 42 | 45 | 30 | 42 | 36 |
| Difference | -79 | -84 | -64 | -46 | -50 | -14 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 95 | 135 | 128 | 114 | 149 | 123 |
| Sun Valley | 12 | 11 | 20 | 36 | 30 | 69 |
| Difference | -83 | -123 | -107 | -78 | -119 | -55 |
Snowfall (cm) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 28 | 40 | 29 | 12 | 1 | 0 | 0 | 0 | 0 | 1 | 21 | 30 |
| Sun Valley | 72 | 47 | 27 | 9 | 0 | 0 | 0 | 0 | 0 | 4 | 26 | 75 |
| Difference | +45 | +6 | -2 | -2 | -1 | — | — | — | — | +3 | +5 | +45 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 28 | 40 | 29 | 12 | 1 | 0 |
| Sun Valley | 72 | 47 | 27 | 9 | 0 | 0 |
| Difference | +45 | +6 | -2 | -2 | -1 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 0 | 0 | 0 | 1 | 21 | 30 |
| Sun Valley | 0 | 0 | 0 | 4 | 26 | 75 |
| Difference | — | — | — | +3 | +5 | +45 |
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