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Mount Isa vs Castries
Comparing Mount Isa change · Castries change
Castries is the warmer of the two — about 3°C on the annual average; Castries is the wetter, with 1492 mm 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 3°C on the annual average.
Precipitation
Castries is the wetter — about 1492 mm 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 (°C) Varies through the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mount Isa | 37 | 36 | 35 | 33 | 28 | 25 | 26 | 28 | 32 | — | 37 | 38 |
| Castries | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 29 | 29 | 29 | 28 | 27 |
| Difference | -10 | -9 | -8 | -6 | — | +3 | +3 | +1 | -3 | — | -9 | -11 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Mount Isa | 37 | 36 | 35 | 33 | 28 | 25 |
| Castries | 27 | 27 | 27 | 28 | 28 | 28 |
| Difference | -10 | -9 | -8 | -6 | — | +3 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Mount Isa | 26 | 28 | 32 | — | 37 | 38 |
| Castries | 28 | 29 | 29 | 29 | 28 | 27 |
| Difference | +3 | +1 | -3 | — | -9 | -11 |
Avg low (°C) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mount Isa | 23 | 23 | 21 | 18 | 13 | 9 | 8 | 8 | 13 | — | 21 | 23 |
| Castries | 26 | 25 | 25 | 26 | 27 | 27 | 27 | 28 | 28 | 28 | 27 | 26 |
| Difference | +3 | +2 | +4 | +8 | +14 | +18 | +20 | +19 | +15 | — | +7 | +4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Mount Isa | 23 | 23 | 21 | 18 | 13 | 9 |
| Castries | 26 | 25 | 25 | 26 | 27 | 27 |
| Difference | +3 | +2 | +4 | +8 | +14 | +18 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Mount Isa | 8 | 8 | 13 | — | 21 | 23 |
| Castries | 27 | 28 | 28 | 28 | 27 | 26 |
| Difference | +20 | +19 | +15 | — | +7 | +4 |
Precipitation (mm) Castries runs higher most of the year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mount Isa | 121 | 104 | 65 | 12 | 7 | 9 | 3 | 2 | 10 | 17 | 43 | 77 |
| Castries | 113 | 76 | 66 | 90 | 114 | 134 | 216 | 291 | 224 | 246 | 243 | 149 |
| Difference | -8 | -28 | +1 | +77 | +107 | +124 | +213 | +289 | +214 | +230 | +200 | +72 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Mount Isa | 121 | 104 | 65 | 12 | 7 | 9 |
| Castries | 113 | 76 | 66 | 90 | 114 | 134 |
| Difference | -8 | -28 | +1 | +77 | +107 | +124 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Mount Isa | 3 | 2 | 10 | 17 | 43 | 77 |
| Castries | 216 | 291 | 224 | 246 | 243 | 149 |
| Difference | +213 | +289 | +214 | +230 | +200 | +72 |
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