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Helsinki vs Castries
Comparing Helsinki change · Castries change
Castries is the warmer of the two — about 21°C on the annual average; Castries is the wetter, with 1285 mm 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 21°C on the annual average.
Precipitation
Castries is the wetter — about 1285 mm 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 (°C) Castries 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 |
| Castries | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 27 |
| Difference | +29 | +29 | +25 | +18 | +12 | +8 | +6 | +8 | +13 | +20 | +25 | +27 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | -2 | -2 | 2 | 9 | 16 | 20 |
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Difference | +29 | +29 | +25 | +18 | +12 | +8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 23 | 21 | 16 | 9 | 3 | 0 |
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Difference | +6 | +8 | +13 | +20 | +25 | +27 |
Avg low (°C) Castries 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 |
| Castries | 26 | 25 | 25 | 26 | 27 | 27 | 27 | 28 | 28 | 28 | 27 | 26 |
| Difference | +33 | +33 | +30 | +26 | +22 | +17 | +14 | +16 | +20 | +25 | +28 | +31 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | -7 | -8 | -5 | 0 | 5 | 10 |
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Difference | +33 | +33 | +30 | +26 | +22 | +17 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 13 | 12 | 8 | 3 | -1 | -4 |
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Difference | +14 | +16 | +20 | +25 | +28 | +31 |
Precipitation (mm) Castries runs higher most of 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 |
| Castries | 113 | 76 | 66 | 90 | 114 | 134 | 216 | 291 | 224 | 246 | 243 | 149 |
| Difference | +60 | +36 | +33 | +54 | +75 | +70 | +152 | +214 | +163 | +167 | +173 | +88 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Helsinki | 53 | 40 | 33 | 36 | 39 | 64 |
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Difference | +60 | +36 | +33 | +54 | +75 | +70 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Helsinki | 64 | 78 | 61 | 79 | 70 | 61 |
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Difference | +152 | +214 | +163 | +167 | +173 | +88 |
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