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Reykjavík vs Big Sky

Cfc Subpolar oceanicDfc Subarctic

Comparing Reykjavík change · Big Sky change

Bottom line

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.

Warmer Reykjavík 4°F on the year
Wetter Reykjavík 28 in more a year
Sunnier Big Sky 20 pp less cloud
Colder winters Big Sky 25°F colder nights

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.

-0°20°40°60°80° JanAprJulOct ReykjavíkBig Sky

Precipitation

Reykjavík is the wetter — about 28 in more across the year.

PRECIPITATION (in) 036 JanAprJulOct ReykjavíkBig Sky

Clear skies

Big Sky has the clearer skies — the higher line.

0%25%50%75%100% JanAprJulOct ReykjavíkBig Sky

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
JanFebMarAprMayJunJulAugSepOctNovDec
Reykjavík383738444954575652454038
Big Sky283344516070828069523727
Difference-9-4+5+7+11+16+25+24+17+7-3-12
Jan – JunJanFebMarAprMayJun
Reykjavík383738444954
Big Sky283344516070
Difference-9-4+5+7+11+16
Jul – DecJulAugSepOctNovDec
Reykjavík575652454038
Big Sky828069523727
Difference+25+24+17+7-3-12
Avg low (°F) Reykjavík runs higher most of the year
JanFebMarAprMayJunJulAugSepOctNovDec
Reykjavík292829343944474743373231
Big Sky341220283439362922123
Difference-26-24-17-13-11-10-9-11-14-15-21-28
Jan – JunJanFebMarAprMayJun
Reykjavík292829343944
Big Sky3412202834
Difference-26-24-17-13-11-10
Jul – DecJulAugSepOctNovDec
Reykjavík474743373231
Big Sky39362922123
Difference-9-11-14-15-21-28
Precipitation (in) Reykjavík runs higher most of the year
JanFebMarAprMayJunJulAugSepOctNovDec
Reykjavík5.254.333.723.85.354.55.94.9
Big Sky2.42.42.22.42.521.11.11.31.92.52.8
Difference-2.8-2.6-2.1-0.5-1.2-2.7-4.2-3.7-2.6-3.4-2.1
Jan – JunJanFebMarAprMayJun
Reykjavík5.254.333.72
Big Sky2.42.42.22.42.52
Difference-2.8-2.6-2.1-0.5-1.2
Jul – DecJulAugSepOctNovDec
Reykjavík3.85.354.55.94.9
Big Sky1.11.11.31.92.52.8
Difference-2.7-4.2-3.7-2.6-3.4-2.1
Snowfall (in)
JanFebMarAprMayJunJulAugSepOctNovDec
Reykjavík10.815.811.44.60.400000.48.211.9
Big Sky
Difference
Jan – JunJanFebMarAprMayJun
Reykjavík10.815.811.44.60.40
Big Sky
Difference
Jul – DecJulAugSepOctNovDec
Reykjavík0000.48.211.9
Big Sky
Difference
Cloud cover (%) Reykjavík runs higher most of the year
JanFebMarAprMayJunJulAugSepOctNovDec
Reykjavík858282797679817979788284
Big Sky676771716858414246586768
Difference-18-15-11-8-8-22-40-38-33-19-14-16
Jan – JunJanFebMarAprMayJun
Reykjavík858282797679
Big Sky676771716858
Difference-18-15-11-8-8-22
Jul – DecJulAugSepOctNovDec
Reykjavík817979788284
Big Sky414246586768
Difference-40-38-33-19-14-16
Relative humidity (%) Varies through the year
JanFebMarAprMayJunJulAugSepOctNovDec
Reykjavík888786848383858686888888
Big Sky999995837367554954688798
Difference+11+12+9-2-11-16-30-37-32-20+10
Jan – JunJanFebMarAprMayJun
Reykjavík888786848383
Big Sky999995837367
Difference+11+12+9-2-11-16
Jul – DecJulAugSepOctNovDec
Reykjavík858686888888
Big Sky554954688798
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.

How we build these numbers →