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Mount Isa vs Castries
Comparing Mount Isa change · Castries change
Castries is the warmer of the two — about 5°F on the annual average; Castries is the wetter, with 59 in more rain a year, and Mount Isa the sunnier.
How the seasons compare
The differences between Mount Isa and Castries, in everyday terms.
Summers
Mount Isa has far hotter summers
Mount Isa: Very hot
Castries: Warm
Winters
Castries has far milder winters
Mount Isa: Cool
Castries: Stays warm
Rain & snow
Castries is much wetter
Mount Isa: Fairly dry
Castries: Very wet
Sky
Mount Isa is sunnier
Mount Isa: Fairly sunny
Castries: Fairly sunny
Month-by-month charts
Temperature
Castries is the warmer of the two — about 5°F on the annual average.
Precipitation
Castries is the wetter — about 59 in more across the year.
Clear skies
Mount Isa 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) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mount Isa | 98 | 97 | 96 | 91 | 83 | 77 | 78 | 82 | 90 | — | 99 | 101 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | -18 | -17 | -15 | -10 | -1 | +6 | +5 | +2 | -6 | — | -16 | -19 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Mount Isa | 98 | 97 | 96 | 91 | 83 | 77 |
| Castries | 80 | 80 | 80 | 82 | 83 | 83 |
| Difference | -18 | -17 | -15 | -10 | -1 | +6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Mount Isa | 78 | 82 | 90 | — | 99 | 101 |
| Castries | 83 | 84 | 84 | 83 | 83 | 81 |
| Difference | +5 | +2 | -6 | — | -16 | -19 |
Avg low (°F) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mount Isa | 73 | 73 | 70 | 65 | 55 | 48 | 46 | 47 | 55 | — | 69 | 73 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +5 | +4 | +8 | +14 | +26 | +33 | +35 | +34 | +27 | — | +12 | +7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Mount Isa | 73 | 73 | 70 | 65 | 55 | 48 |
| Castries | 78 | 77 | 78 | 79 | 80 | 81 |
| Difference | +5 | +4 | +8 | +14 | +26 | +33 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Mount Isa | 46 | 47 | 55 | — | 69 | 73 |
| Castries | 81 | 82 | 82 | 82 | 81 | 79 |
| Difference | +35 | +34 | +27 | — | +12 | +7 |
Precipitation (in) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mount Isa | 4.8 | 4.1 | 2.6 | 0.5 | 0.3 | 0.4 | 0.1 | 0.1 | 0.4 | 0.7 | 1.7 | 3 |
| 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 | -0.3 | -1.1 | +0.1 | +3 | +4.2 | +4.9 | +8.4 | +11.4 | +8.4 | +9 | +7.9 | +2.8 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Mount Isa | 4.8 | 4.1 | 2.6 | 0.5 | 0.3 | 0.4 |
| Castries | 4.5 | 3 | 2.6 | 3.5 | 4.5 | 5.3 |
| Difference | -0.3 | -1.1 | +0.1 | +3 | +4.2 | +4.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Mount Isa | 0.1 | 0.1 | 0.4 | 0.7 | 1.7 | 3 |
| Castries | 8.5 | 11.5 | 8.8 | 9.7 | 9.6 | 5.9 |
| Difference | +8.4 | +11.4 | +8.4 | +9 | +7.9 | +2.8 |
Cloud cover (%) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mount Isa | 61 | 55 | 43 | 28 | 25 | 17 | 15 | 13 | 19 | 30 | 44 | 52 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | -22 | -16 | -1 | +21 | +27 | +42 | +35 | +34 | +32 | +22 | +2 | -11 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Mount Isa | 61 | 55 | 43 | 28 | 25 | 17 |
| Castries | 38 | 39 | 42 | 49 | 52 | 59 |
| Difference | -22 | -16 | -1 | +21 | +27 | +42 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Mount Isa | 15 | 13 | 19 | 30 | 44 | 52 |
| Castries | 50 | 46 | 51 | 51 | 46 | 41 |
| Difference | +35 | +34 | +32 | +22 | +2 | -11 |
Relative humidity (%) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mount Isa | 53 | 57 | 53 | 40 | 40 | 42 | 37 | 30 | 26 | 26 | 33 | 41 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | +22 | +18 | +22 | +36 | +38 | +37 | +42 | +49 | +52 | +53 | +46 | +36 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Mount Isa | 53 | 57 | 53 | 40 | 40 | 42 |
| Castries | 76 | 75 | 75 | 76 | 77 | 79 |
| Difference | +22 | +18 | +22 | +36 | +38 | +37 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Mount Isa | 37 | 30 | 26 | 26 | 33 | 41 |
| Castries | 79 | 79 | 79 | 79 | 79 | 77 |
| Difference | +42 | +49 | +52 | +53 | +46 | +36 |
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. Mount Isa trends → · Castries trends →
Methodology & sources
Mount Isa
Temperature & precipitation — 1991–2020 normals computed from 17 years of daily observations at Mount Isa Mine, a weather station, about 2 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 Mount Isa · change Castries → · Mount Isa page · Castries page