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Arcachon vs Castries
Comparing Arcachon change · Castries change
Castries is the warmer of the two — about 24°F on the annual average; Castries is the wetter, with 43 in more rain a year, and Castries the sunnier.
How the seasons compare
The differences between Arcachon and Castries, in everyday terms.
Summers
Summers are nearly the same
Arcachon: Warm
Castries: Warm
Winters
Castries has far milder winters
Arcachon: Chilly
Castries: Stays warm
Rain & snow
Castries is much wetter
Arcachon: Moderate rainfall
Castries: Very wet
Sky
Castries is sunnier
Arcachon: Often cloudy
Castries: Fairly sunny
Month-by-month charts
Temperature
Castries is the warmer of the two — about 24°F on the annual average.
Precipitation
Castries is the wetter — about 43 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Arcachon | 51 | 54 | 61 | 65 | 72 | 78 | 82 | 83 | 76 | 68 | 58 | 52 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | +29 | +26 | +20 | +16 | +11 | +5 | +1 | +1 | +8 | +16 | +25 | +29 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Arcachon | 51 | 54 | 61 | 65 | 72 | 78 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Difference | +29 | +26 | +20 | +16 | +11 | +5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Arcachon | 82 | 83 | 76 | 68 | 58 | 52 |
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | +1 | +1 | +8 | +16 | +25 | +29 |
Avg low (°F) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Arcachon | 38 | 37 | 42 | 45 | 51 | 57 | 60 | 60 | 55 | 50 | 43 | 39 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +40 | +40 | +36 | +34 | +29 | +24 | +21 | +21 | +27 | +32 | +38 | +41 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Arcachon | 38 | 37 | 42 | 45 | 51 | 57 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Difference | +40 | +40 | +36 | +34 | +29 | +24 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Arcachon | 60 | 60 | 55 | 50 | 43 | 39 |
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +21 | +21 | +27 | +32 | +38 | +41 |
Precipitation (in) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Arcachon | 3.4 | 2.4 | 2.4 | 2.7 | 2.7 | 2.8 | 1.8 | 2.1 | 3.1 | 3.1 | 4 | 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 | +1.1 | +0.6 | +0.2 | +0.9 | +1.8 | +2.4 | +6.8 | +9.4 | +5.8 | +6.6 | +5.5 | +1.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Arcachon | 3.4 | 2.4 | 2.4 | 2.7 | 2.7 | 2.8 |
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Difference | +1.1 | +0.6 | +0.2 | +0.9 | +1.8 | +2.4 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Arcachon | 1.8 | 2.1 | 3.1 | 3.1 | 4 | 4 |
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Difference | +6.8 | +9.4 | +5.8 | +6.6 | +5.5 | +1.9 |
Cloud cover (%) Arcachon runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Arcachon | 70 | 65 | 64 | 66 | 67 | 61 | 55 | 54 | 55 | 64 | 69 | 70 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -32 | -26 | -22 | -17 | -15 | -3 | -5 | -8 | -5 | -13 | -23 | -29 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Arcachon | 70 | 65 | 64 | 66 | 67 | 61 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Difference | -32 | -26 | -22 | -17 | -15 | -3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Arcachon | 55 | 54 | 55 | 64 | 69 | 70 |
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -5 | -8 | -5 | -13 | -23 | -29 |
Relative humidity (%) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Arcachon | 90 | 86 | 81 | 78 | 76 | 73 | 70 | 68 | 70 | 80 | 87 | 90 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | -14 | -11 | -7 | -1 | +2 | +5 | +9 | +11 | +8 | -1 | -8 | -14 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Arcachon | 90 | 86 | 81 | 78 | 76 | 73 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Difference | -14 | -11 | -7 | -1 | +2 | +5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Arcachon | 70 | 68 | 70 | 80 | 87 | 90 |
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | +9 | +11 | +8 | -1 | -8 | -14 |
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. Arcachon trends → · Castries trends →
Methodology & sources
Arcachon
Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Bordeaux Merignac, a weather station, about 41 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 Arcachon · change Castries → · Arcachon page · Castries page