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Reykjavík vs Castries
Comparing Reykjavík change · Castries change
Castries is the warmer of the two — about 40°F on the annual average; Castries is the wetter, with 25 in more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Reykjavík and Castries, in everyday terms.
Summers
Castries has far hotter summers
Reykjavík: Cool
Castries: Warm
Winters
Castries has far milder winters
Reykjavík: Cold
Castries: Stays warm
Rain & snow
Castries is wetter
Reykjavík: Wet
Castries: Very wet
Sky
Castries is far sunnier
Reykjavík: Often grey
Castries: Fairly sunny
Month-by-month charts
Temperature
Castries is the warmer of the two — about 40°F on the annual average.
Precipitation
Castries is the wetter — about 25 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 38 | 37 | 38 | 44 | 49 | 54 | 57 | 56 | 52 | 45 | 40 | 38 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | +43 | +42 | +42 | +38 | +34 | +29 | +26 | +28 | +32 | +38 | +42 | +43 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 38 | 37 | 38 | 44 | 49 | 54 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Difference | +43 | +42 | +42 | +38 | +34 | +29 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 57 | 56 | 52 | 45 | 40 | 38 |
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | +26 | +28 | +32 | +38 | +42 | +43 |
Avg low (°F) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 29 | 28 | 29 | 34 | 39 | 44 | 47 | 47 | 43 | 37 | 32 | 31 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +49 | +50 | +49 | +45 | +41 | +37 | +34 | +34 | +39 | +45 | +48 | +49 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 29 | 28 | 29 | 34 | 39 | 44 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Difference | +49 | +50 | +49 | +45 | +41 | +37 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 47 | 47 | 43 | 37 | 32 | 31 |
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +34 | +34 | +39 | +45 | +48 | +49 |
Precipitation (in) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 5.2 | 5 | 4.3 | 3 | 3.7 | 2 | 3.8 | 5.3 | 5 | 4.5 | 5.9 | 4.9 |
| 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 | -0.8 | -2 | -1.7 | +0.6 | +0.8 | +3.3 | +4.8 | +6.2 | +3.8 | +5.2 | +3.7 | +1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 5.2 | 5 | 4.3 | 3 | 3.7 | 2 |
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Difference | -0.8 | -2 | -1.7 | +0.6 | +0.8 | +3.3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 3.8 | 5.3 | 5 | 4.5 | 5.9 | 4.9 |
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Difference | +4.8 | +6.2 | +3.8 | +5.2 | +3.7 | +1 |
Snowfall (in)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 10.8 | 15.8 | 11.4 | 4.6 | 0.4 | 0 | 0 | 0 | 0 | 0.4 | 8.2 | 11.9 |
| Castries | — | — | — | — | — | — | — | — | — | — | — | — |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 10.8 | 15.8 | 11.4 | 4.6 | 0.4 | 0 |
| Castries | — | — | — | — | — | — |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 0 | 0 | 0 | 0.4 | 8.2 | 11.9 |
| Castries | — | — | — | — | — | — |
| Difference | — | — | — | — | — | — |
Cloud cover (%) Reykjavík runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 85 | 82 | 82 | 79 | 76 | 79 | 81 | 79 | 79 | 78 | 82 | 84 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -46 | -44 | -40 | -30 | -24 | -21 | -32 | -33 | -28 | -26 | -35 | -44 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 85 | 82 | 82 | 79 | 76 | 79 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Difference | -46 | -44 | -40 | -30 | -24 | -21 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 81 | 79 | 79 | 78 | 82 | 84 |
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -32 | -33 | -28 | -26 | -35 | -44 |
Relative humidity (%) Reykjavík runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 88 | 87 | 86 | 84 | 83 | 83 | 85 | 86 | 86 | 88 | 88 | 88 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | -12 | -13 | -11 | -8 | -6 | -5 | -6 | -7 | -8 | -8 | -8 | -11 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 88 | 87 | 86 | 84 | 83 | 83 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Difference | -12 | -13 | -11 | -8 | -6 | -5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 85 | 86 | 86 | 88 | 88 | 88 |
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | -6 | -7 | -8 | -8 | -8 | -11 |
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 → · Castries trends →
Reykjavík is projected to shift from Cfc to Cfb by the 2071–2099 window (SSP2-4.5).
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.
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.
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