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Reykjavík vs Big Sky
Comparing Reykjavík change · Big Sky change
Reykjavík is the warmer of the two — about 4°F on the annual average; Reykjavík is the wetter, with 28 in more rain a year, and Big Sky the sunnier.
How the seasons compare
The differences between Reykjavík and Big Sky, in everyday terms.
Summers
Big Sky has far hotter summers
Reykjavík: Cool
Big Sky: Warm
Winters
Reykjavík has far milder winters
Reykjavík: Cold
Big Sky: Bitterly cold
Rain & snow
Reykjavík is wetter
Reykjavík: Wet
Big Sky: Moderate rainfall
Sky
Big Sky is sunnier
Reykjavík: Often grey
Big Sky: Partly cloudy
Month-by-month charts
Temperature
Reykjavík is the warmer of the two — about 4°F on the annual average.
Precipitation
Reykjavík is the wetter — about 28 in more across the year.
Clear skies
Big Sky 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) Varies through 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 |
| Big Sky | 28 | 33 | 44 | 51 | 60 | 70 | 82 | 80 | 69 | 52 | 37 | 27 |
| Difference | -9 | -4 | +5 | +7 | +11 | +16 | +25 | +24 | +17 | +7 | -3 | -12 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 38 | 37 | 38 | 44 | 49 | 54 |
| Big Sky | 28 | 33 | 44 | 51 | 60 | 70 |
| Difference | -9 | -4 | +5 | +7 | +11 | +16 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 57 | 56 | 52 | 45 | 40 | 38 |
| Big Sky | 82 | 80 | 69 | 52 | 37 | 27 |
| Difference | +25 | +24 | +17 | +7 | -3 | -12 |
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 |
| Big Sky | 3 | 4 | 12 | 20 | 28 | 34 | 39 | 36 | 29 | 22 | 12 | 3 |
| Difference | -26 | -24 | -17 | -13 | -11 | -10 | -9 | -11 | -14 | -15 | -21 | -28 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 29 | 28 | 29 | 34 | 39 | 44 |
| Big Sky | 3 | 4 | 12 | 20 | 28 | 34 |
| Difference | -26 | -24 | -17 | -13 | -11 | -10 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 47 | 47 | 43 | 37 | 32 | 31 |
| Big Sky | 39 | 36 | 29 | 22 | 12 | 3 |
| Difference | -9 | -11 | -14 | -15 | -21 | -28 |
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 |
| Big Sky | 2.4 | 2.4 | 2.2 | 2.4 | 2.5 | 2 | 1.1 | 1.1 | 1.3 | 1.9 | 2.5 | 2.8 |
| Difference | -2.8 | -2.6 | -2.1 | -0.5 | -1.2 | — | -2.7 | -4.2 | -3.7 | -2.6 | -3.4 | -2.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 5.2 | 5 | 4.3 | 3 | 3.7 | 2 |
| Big Sky | 2.4 | 2.4 | 2.2 | 2.4 | 2.5 | 2 |
| Difference | -2.8 | -2.6 | -2.1 | -0.5 | -1.2 | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 3.8 | 5.3 | 5 | 4.5 | 5.9 | 4.9 |
| Big Sky | 1.1 | 1.1 | 1.3 | 1.9 | 2.5 | 2.8 |
| Difference | -2.7 | -4.2 | -3.7 | -2.6 | -3.4 | -2.1 |
Snowfall (in)
| 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 |
| Big Sky | — | — | — | — | — | — | — | — | — | — | — | — |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 10.8 | 15.8 | 11.4 | 4.6 | 0.4 | 0 |
| Big Sky | — | — | — | — | — | — |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 0 | 0 | 0 | 0.4 | 8.2 | 11.9 |
| Big Sky | — | — | — | — | — | — |
| Difference | — | — | — | — | — | — |
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 |
| Big Sky | 67 | 67 | 71 | 71 | 68 | 58 | 41 | 42 | 46 | 58 | 67 | 68 |
| Difference | -18 | -15 | -11 | -8 | -8 | -22 | -40 | -38 | -33 | -19 | -14 | -16 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 85 | 82 | 82 | 79 | 76 | 79 |
| Big Sky | 67 | 67 | 71 | 71 | 68 | 58 |
| Difference | -18 | -15 | -11 | -8 | -8 | -22 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 81 | 79 | 79 | 78 | 82 | 84 |
| Big Sky | 41 | 42 | 46 | 58 | 67 | 68 |
| Difference | -40 | -38 | -33 | -19 | -14 | -16 |
Relative humidity (%) Varies through 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 |
| Big Sky | 99 | 99 | 95 | 83 | 73 | 67 | 55 | 49 | 54 | 68 | 87 | 98 |
| Difference | +11 | +12 | +9 | -2 | -11 | -16 | -30 | -37 | -32 | -20 | — | +10 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 88 | 87 | 86 | 84 | 83 | 83 |
| Big Sky | 99 | 99 | 95 | 83 | 73 | 67 |
| Difference | +11 | +12 | +9 | -2 | -11 | -16 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 85 | 86 | 86 | 88 | 88 | 88 |
| Big Sky | 55 | 49 | 54 | 68 | 87 | 98 |
| Difference | -30 | -37 | -32 | -20 | — | +10 |
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 → · Big Sky 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.
Big Sky
Temperature & precipitation — 1991–2020 normals computed from 22 years of daily observations at West Yellowstone, a weather station, about 73 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 Big Sky → · Reykjavík page · Big Sky page