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Byron Bay vs Castries
Comparing Byron Bay change · Castries change
Castries is the warmer of the two — about 14°F on the annual average; Castries is the wetter, with 8 in more rain a year.
How the seasons compare
The differences between Byron Bay and Castries, in everyday terms.
Summers
Summers are nearly the same
Byron Bay: Warm
Castries: Warm
Winters
Castries has far milder winters
Byron Bay: Cool
Castries: Stays warm
Rain & snow
Castries is wetter
Byron Bay: Very wet
Castries: Very wet
Sky
Similar amounts of sun
Byron Bay: Partly cloudy
Castries: Fairly sunny
Month-by-month charts
Temperature
Castries is the warmer of the two — about 14°F on the annual average.
Precipitation
Castries is the wetter — about 8 in more across the year.
Clear skies
The two cities see a similar amount of sun.
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) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Byron Bay | 83 | 83 | 81 | 77 | 73 | 68 | 68 | 71 | 74 | 77 | 79 | 82 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | -3 | -3 | — | +4 | +10 | +15 | +15 | +13 | +10 | +7 | +3 | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Byron Bay | 83 | 83 | 81 | 77 | 73 | 68 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Difference | -3 | -3 | — | +4 | +10 | +15 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Byron Bay | 68 | 71 | 74 | 77 | 79 | 82 |
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | +15 | +13 | +10 | +7 | +3 | — |
Avg low (°F) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Byron Bay | 68 | 67 | 65 | 60 | 54 | 50 | 48 | 48 | 53 | 57 | 62 | 65 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +10 | +10 | +13 | +19 | +27 | +30 | +33 | +34 | +29 | +24 | +19 | +14 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Byron Bay | 68 | 67 | 65 | 60 | 54 | 50 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Difference | +10 | +10 | +13 | +19 | +27 | +30 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Byron Bay | 48 | 48 | 53 | 57 | 62 | 65 |
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +33 | +34 | +29 | +24 | +19 | +14 |
Precipitation (in) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Byron Bay | 6.6 | 8 | 8.2 | 7.4 | 6.2 | 8.2 | 4.4 | 3.6 | 2.5 | 3.9 | 4.8 | 5.7 |
| 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 | -2.1 | -5 | -5.6 | -3.9 | -1.7 | -3 | +4.1 | +7.9 | +6.3 | +5.8 | +4.7 | +0.1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Byron Bay | 6.6 | 8 | 8.2 | 7.4 | 6.2 | 8.2 |
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Difference | -2.1 | -5 | -5.6 | -3.9 | -1.7 | -3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Byron Bay | 4.4 | 3.6 | 2.5 | 3.9 | 4.8 | 5.7 |
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Difference | +4.1 | +7.9 | +6.3 | +5.8 | +4.7 | +0.1 |
Cloud cover (%) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Byron Bay | 60 | 61 | 58 | 54 | 52 | 51 | 44 | 40 | 41 | 51 | 58 | 59 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -22 | -23 | -16 | -5 | — | +8 | +6 | +6 | +10 | — | -12 | -19 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Byron Bay | 60 | 61 | 58 | 54 | 52 | 51 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Difference | -22 | -23 | -16 | -5 | — | +8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Byron Bay | 44 | 40 | 41 | 51 | 58 | 59 |
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | +6 | +6 | +10 | — | -12 | -19 |
Relative humidity (%) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Byron Bay | 77 | 77 | 76 | 73 | 71 | 72 | 70 | 69 | 71 | 73 | 75 | 76 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | -1 | -2 | -1 | +3 | +6 | +7 | +9 | +10 | +7 | +6 | +4 | +1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Byron Bay | 77 | 77 | 76 | 73 | 71 | 72 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Difference | -1 | -2 | -1 | +3 | +6 | +7 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Byron Bay | 70 | 69 | 71 | 73 | 75 | 76 |
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | +9 | +10 | +7 | +6 | +4 | +1 |
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. Byron Bay trends → · Castries trends →
Methodology & sources
Byron Bay
Temperature & precipitation — 1991–2020 normals computed from 27 years of daily observations at Ballina Airport Aws, a weather station, about 21 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 Byron Bay · change Castries → · Byron Bay page · Castries page