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Reykjavík vs Castries
Comparing Reykjavík change · Castries change
Castries is the warmer of the two — about 22°C on the annual average; Castries is the wetter, with 630 mm 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 22°C on the annual average.
Precipitation
Castries is the wetter — about 630 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 3 | 3 | 4 | 6 | 9 | 12 | 14 | 13 | 11 | 7 | 5 | 4 |
| Castries | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 27 |
| Difference | +24 | +24 | +23 | +21 | +19 | +16 | +15 | +15 | +18 | +21 | +23 | +24 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 3 | 3 | 4 | 6 | 9 | 12 |
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Difference | +24 | +24 | +23 | +21 | +19 | +16 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 14 | 13 | 11 | 7 | 5 | 4 |
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Difference | +15 | +15 | +18 | +21 | +23 | +24 |
Avg low (°C) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | -1 | -2 | -2 | 1 | 4 | 7 | 9 | 9 | 6 | 3 | 0 | -1 |
| Castries | 26 | 25 | 25 | 26 | 27 | 27 | 27 | 28 | 28 | 28 | 27 | 26 |
| Difference | +27 | +28 | +27 | +25 | +23 | +21 | +19 | +19 | +21 | +25 | +27 | +27 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | -1 | -2 | -2 | 1 | 4 | 7 |
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Difference | +27 | +28 | +27 | +25 | +23 | +21 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 9 | 9 | 6 | 3 | 0 | -1 |
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Difference | +19 | +19 | +21 | +25 | +27 | +27 |
Precipitation (mm) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 133 | 127 | 109 | 75 | 93 | 50 | 95 | 135 | 128 | 114 | 149 | 123 |
| Castries | 113 | 76 | 66 | 90 | 114 | 134 | 216 | 291 | 224 | 246 | 243 | 149 |
| Difference | -20 | -51 | -43 | +14 | +21 | +83 | +121 | +157 | +97 | +132 | +93 | +26 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 133 | 127 | 109 | 75 | 93 | 50 |
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Difference | -20 | -51 | -43 | +14 | +21 | +83 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 95 | 135 | 128 | 114 | 149 | 123 |
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Difference | +121 | +157 | +97 | +132 | +93 | +26 |
Snowfall (cm)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reykjavík | 28 | 40 | 29 | 12 | 1 | 0 | 0 | 0 | 0 | 1 | 21 | 30 |
| Castries | — | — | — | — | — | — | — | — | — | — | — | — |
| Difference | — | — | — | — | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Reykjavík | 28 | 40 | 29 | 12 | 1 | 0 |
| Castries | — | — | — | — | — | — |
| Difference | — | — | — | — | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Reykjavík | 0 | 0 | 0 | 1 | 21 | 30 |
| 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.
← change Reykjavík · change Castries → · Reykjavík page · Castries page