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Helsinki vs Sun Valley
Comparing Helsinki change · Sun Valley change
Helsinki is the warmer of the two — about 2°F on the annual average; Helsinki is the wetter, with 10 in more rain a year, and Sun Valley the sunnier.
How the seasons compare
The differences between Helsinki and Sun Valley, in everyday terms.
Summers
Sun Valley has much hotter summers
Helsinki: Mild
Sun Valley: Warm
Winters
Helsinki has much milder winters
Helsinki: Very cold
Sun Valley: Very cold
Rain & snow
Helsinki is wetter
Helsinki: Moderate rainfall
Sun Valley: Fairly dry
Sky
Sun Valley is sunnier
Helsinki: Often cloudy
Sun Valley: Partly cloudy
Month-by-month charts
Temperature
Helsinki is the warmer of the two — about 2°F on the annual average.
Precipitation
Helsinki is the wetter — about 10 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Helsinki | 29 | 28 | 36 | 48 | 61 | 68 | 73 | 70 | 60 | 48 | 38 | 33 |
| Sun Valley | 32 | 36 | 43 | 53 | 62 | 70 | 81 | 79 | 70 | 56 | 42 | 31 |
| Difference | +3 | +7 | +7 | +5 | +2 | +2 | +7 | +9 | +10 | +9 | +4 | -1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | 29 | 28 | 36 | 48 | 61 | 68 |
| Sun Valley | 32 | 36 | 43 | 53 | 62 | 70 |
| Difference | +3 | +7 | +7 | +5 | +2 | +2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 73 | 70 | 60 | 48 | 38 | 33 |
| Sun Valley | 81 | 79 | 70 | 56 | 42 | 31 |
| Difference | +7 | +9 | +10 | +9 | +4 | -1 |
Avg low (°F) Helsinki runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Helsinki | 19 | 18 | 23 | 32 | 41 | 50 | 56 | 54 | 46 | 37 | 30 | 24 |
| Sun Valley | 8 | 11 | 18 | 27 | 34 | 39 | 45 | 43 | 36 | 27 | 17 | 9 |
| Difference | -12 | -7 | -5 | -5 | -7 | -11 | -11 | -11 | -10 | -10 | -13 | -15 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | 19 | 18 | 23 | 32 | 41 | 50 |
| Sun Valley | 8 | 11 | 18 | 27 | 34 | 39 |
| Difference | -12 | -7 | -5 | -5 | -7 | -11 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 56 | 54 | 46 | 37 | 30 | 24 |
| Sun Valley | 45 | 43 | 36 | 27 | 17 | 9 |
| Difference | -11 | -11 | -10 | -10 | -13 | -15 |
Precipitation (in) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Helsinki | 2.1 | 1.6 | 1.3 | 1.4 | 1.5 | 2.5 | 2.5 | 3.1 | 2.4 | 3.1 | 2.7 | 2.4 |
| 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 | +0.1 | +0.1 | +0.5 | -0.2 | +0.1 | -1.1 | -2 | -2.6 | -1.6 | -1.7 | -1.6 | +0.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | 2.1 | 1.6 | 1.3 | 1.4 | 1.5 | 2.5 |
| Sun Valley | 2.1 | 1.7 | 1.8 | 1.2 | 1.7 | 1.4 |
| Difference | +0.1 | +0.1 | +0.5 | -0.2 | +0.1 | -1.1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 2.5 | 3.1 | 2.4 | 3.1 | 2.7 | 2.4 |
| Sun Valley | 0.5 | 0.5 | 0.8 | 1.4 | 1.2 | 2.7 |
| Difference | -2 | -2.6 | -1.6 | -1.7 | -1.6 | +0.3 |
Snowfall (in)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Helsinki | — | — | — | — | — | — | — | — | — | — | — | — |
| 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 |
|---|---|---|---|---|---|---|
| Helsinki | — | — | — | — | — | — |
| Sun Valley | 28.5 | 18.3 | 10.4 | 3.7 | 0.2 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | — | — | — | — | — | — |
| Sun Valley | 0 | 0 | 0 | 1.7 | 10.2 | 29.7 |
| Difference | — | — | — | — | — | — |
Cloud cover (%) Helsinki runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Helsinki | 75 | 70 | 65 | 66 | 62 | 65 | 63 | 63 | 67 | 75 | 77 | 77 |
| Sun Valley | 59 | 61 | 64 | 63 | 61 | 50 | 35 | 35 | 39 | 48 | 58 | 61 |
| Difference | -16 | -9 | -1 | -3 | — | -15 | -28 | -27 | -28 | -28 | -19 | -16 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | 75 | 70 | 65 | 66 | 62 | 65 |
| Sun Valley | 59 | 61 | 64 | 63 | 61 | 50 |
| Difference | -16 | -9 | -1 | -3 | — | -15 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 63 | 63 | 67 | 75 | 77 | 77 |
| Sun Valley | 35 | 35 | 39 | 48 | 58 | 61 |
| Difference | -28 | -27 | -28 | -28 | -19 | -16 |
Relative humidity (%) Helsinki runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Helsinki | 98 | 98 | 93 | 83 | 77 | 78 | 80 | 82 | 86 | 92 | 96 | 97 |
| Sun Valley | 84 | 82 | 74 | 64 | 58 | 51 | 39 | 36 | 41 | 54 | 70 | 83 |
| Difference | -14 | -15 | -20 | -19 | -19 | -28 | -41 | -46 | -45 | -38 | -26 | -15 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | 98 | 98 | 93 | 83 | 77 | 78 |
| Sun Valley | 84 | 82 | 74 | 64 | 58 | 51 |
| Difference | -14 | -15 | -20 | -19 | -19 | -28 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 80 | 82 | 86 | 92 | 96 | 97 |
| Sun Valley | 39 | 36 | 41 | 54 | 70 | 83 |
| Difference | -41 | -46 | -45 | -38 | -26 | -15 |
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. Helsinki trends → · Sun Valley trends →
Methodology & sources
Helsinki
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Vantaa Helsinki-vantaan Lentoa, a weather station, about 18 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 Helsinki · change Sun Valley → · Helsinki page · Sun Valley page