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Helsinki vs Sun Valley
Comparing Helsinki change · Sun Valley change
Helsinki is the warmer of the two — about 1°C on the annual average; Helsinki is the wetter, with 248 mm 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 1°C on the annual average.
Precipitation
Helsinki is the wetter — about 248 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Helsinki | -2 | -2 | 2 | 9 | 16 | 20 | 23 | 21 | 16 | 9 | 3 | 0 |
| Sun Valley | -0 | 2 | 6 | 12 | 17 | 21 | 27 | 26 | 21 | 14 | 6 | -0 |
| Difference | +2 | +4 | +4 | +3 | +1 | +1 | +4 | +5 | +5 | +5 | +2 | -1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | -2 | -2 | 2 | 9 | 16 | 20 |
| Sun Valley | -0 | 2 | 6 | 12 | 17 | 21 |
| Difference | +2 | +4 | +4 | +3 | +1 | +1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 23 | 21 | 16 | 9 | 3 | 0 |
| Sun Valley | 27 | 26 | 21 | 14 | 6 | -0 |
| Difference | +4 | +5 | +5 | +5 | +2 | -1 |
Avg low (°C) Helsinki runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Helsinki | -7 | -8 | -5 | 0 | 5 | 10 | 13 | 12 | 8 | 3 | -1 | -4 |
| Sun Valley | -14 | -12 | -8 | -3 | 1 | 4 | 7 | 6 | 2 | -3 | -8 | -13 |
| Difference | -6 | -4 | -3 | -3 | -4 | -6 | -6 | -6 | -6 | -6 | -7 | -8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | -7 | -8 | -5 | 0 | 5 | 10 |
| Sun Valley | -14 | -12 | -8 | -3 | 1 | 4 |
| Difference | -6 | -4 | -3 | -3 | -4 | -6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 13 | 12 | 8 | 3 | -1 | -4 |
| Sun Valley | 7 | 6 | 2 | -3 | -8 | -13 |
| Difference | -6 | -6 | -6 | -6 | -7 | -8 |
Precipitation (mm) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Helsinki | 53 | 40 | 33 | 36 | 39 | 64 | 64 | 78 | 61 | 79 | 70 | 61 |
| Sun Valley | 54 | 42 | 45 | 30 | 42 | 36 | 12 | 11 | 20 | 36 | 30 | 69 |
| Difference | +1 | +2 | +11 | -6 | +4 | -28 | -51 | -66 | -41 | -43 | -39 | +7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | 53 | 40 | 33 | 36 | 39 | 64 |
| Sun Valley | 54 | 42 | 45 | 30 | 42 | 36 |
| Difference | +1 | +2 | +11 | -6 | +4 | -28 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 64 | 78 | 61 | 79 | 70 | 61 |
| Sun Valley | 12 | 11 | 20 | 36 | 30 | 69 |
| Difference | -51 | -66 | -41 | -43 | -39 | +7 |
Snowfall (cm)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Helsinki | — | — | — | — | — | — | — | — | — | — | — | — |
| Sun Valley | 72 | 47 | 27 | 9 | 0 | 0 | 0 | 0 | 0 | 4 | 26 | 75 |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | — | — | — | — | — | — |
| Sun Valley | 72 | 47 | 27 | 9 | 0 | 0 |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | — | — | — | — | — | — |
| Sun Valley | 0 | 0 | 0 | 4 | 26 | 75 |
| 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