Home › Compare › Helsinki vs Castries
Helsinki vs Castries
Comparing Helsinki change · Castries change
Castries is the warmer of the two — about 38°F on the annual average; Castries is the wetter, with 51 in more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Helsinki and Castries, in everyday terms.
Summers
Castries has much hotter summers
Helsinki: Mild
Castries: Warm
Winters
Castries has far milder winters
Helsinki: Very cold
Castries: Stays warm
Rain & snow
Castries is much wetter
Helsinki: Moderate rainfall
Castries: Very wet
Sky
Castries is sunnier
Helsinki: Often cloudy
Castries: Fairly sunny
Month-by-month charts
Temperature
Castries is the warmer of the two — about 38°F on the annual average.
Precipitation
Castries is the wetter — about 51 in more across the year.
Clear skies
Castries 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) Castries 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 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | +51 | +51 | +45 | +33 | +22 | +15 | +10 | +14 | +24 | +36 | +44 | +49 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | 29 | 28 | 36 | 48 | 61 | 68 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Difference | +51 | +51 | +45 | +33 | +22 | +15 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 73 | 70 | 60 | 48 | 38 | 33 |
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | +10 | +14 | +24 | +36 | +44 | +49 |
Avg low (°F) Castries 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 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +59 | +60 | +55 | +47 | +39 | +31 | +25 | +28 | +36 | +45 | +51 | +55 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | 19 | 18 | 23 | 32 | 41 | 50 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Difference | +59 | +60 | +55 | +47 | +39 | +31 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 56 | 54 | 46 | 37 | 30 | 24 |
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +25 | +28 | +36 | +45 | +51 | +55 |
Precipitation (in) Castries runs higher most of 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 |
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Difference | +2.4 | +1.4 | +1.3 | +2.1 | +3 | +2.8 | +6 | +8.4 | +6.4 | +6.6 | +6.8 | +3.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | 2.1 | 1.6 | 1.3 | 1.4 | 1.5 | 2.5 |
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Difference | +2.4 | +1.4 | +1.3 | +2.1 | +3 | +2.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 2.5 | 3.1 | 2.4 | 3.1 | 2.7 | 2.4 |
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Difference | +6 | +8.4 | +6.4 | +6.6 | +6.8 | +3.5 |
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 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -37 | -31 | -23 | -17 | -9 | -6 | -13 | -16 | -16 | -24 | -31 | -36 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | 75 | 70 | 65 | 66 | 62 | 65 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Difference | -37 | -31 | -23 | -17 | -9 | -6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 63 | 63 | 67 | 75 | 77 | 77 |
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -13 | -16 | -16 | -24 | -31 | -36 |
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 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | -22 | -23 | -19 | -7 | — | — | -1 | -3 | -8 | -12 | -16 | -20 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | 98 | 98 | 93 | 83 | 77 | 78 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Difference | -22 | -23 | -19 | -7 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 80 | 82 | 86 | 92 | 96 | 97 |
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | -1 | -3 | -8 | -12 | -16 | -20 |
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 → · Castries trends →
Both cities' Köppen climate types are projected to hold steady through 2099 (SSP2-4.5).
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.
Castries
Temperature — modelled for this location from ERA5-Land reanalysis, a ~9 km global grid, because no long-record weather station is close enough to use.
Precipitation — 1991–2020 normals computed from 10 years of daily observations at LE Lamentin, a weather station, about 66 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 Castries → · Helsinki page · Castries page