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Karratha vs Castries

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Comparing Karratha change · Castries change

Bottom line

Karratha and Castries have nearly identical year-round temperatures; Castries is the wetter, with 1645 mm more rain a year, and Karratha the sunnier.

Year-round temp About the same within 1°C on the year

Wetter Castries 1645 mm more a year

Sunnier Karratha 14 pp less cloud

Colder winters Karratha 11°C colder nights

How the seasons compare

The differences between Karratha and Castries, in everyday terms.

Summers

Karratha has much hotter summers

Karratha: Very hot
Castries: Warm

Winters

Castries has much milder winters

Karratha: Mild
Castries: Stays warm

Rain & snow

Castries is much wetter

Karratha: Fairly dry
Castries: Very wet

Sky

Karratha is sunnier

Karratha: Fairly sunny
Castries: Fairly sunny

Month-by-month charts

Temperature

Karratha and Castries run remarkably close all year.

Precipitation

Castries is the wetter — about 1645 mm more across the year.

Clear skies

Karratha 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) Karratha runs higher most of the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Karratha	36	36	36	34	30	27	27	28	31	34	35	36
Castries	27	27	27	28	28	28	28	29	29	29	28	27
Difference	-9	-9	-9	-7	-2	+2	+2	—	-2	-6	-7	-8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Karratha	36	36	36	34	30	27
Castries	27	27	27	28	28	28
Difference	-9	-9	-9	-7	-2	+2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Karratha	27	28	31	34	35	36
Castries	28	29	29	29	28	27
Difference	+2	—	-2	-6	-7	-8

Avg low (°C) Castries runs higher most of the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Karratha	27	27	26	23	18	15	14	14	17	21	23	26
Castries	26	25	25	26	27	27	27	28	28	28	27	26
Difference	-1	-2	-1	+3	+9	+12	+13	+13	+11	+7	+4	+1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Karratha	27	27	26	23	18	15
Castries	26	25	25	26	27	27
Difference	-1	-2	-1	+3	+9	+12

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Karratha	14	14	17	21	23	26
Castries	27	28	28	28	27	26
Difference	+13	+13	+11	+7	+4	+1

Precipitation (mm) Castries runs higher most of the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Karratha	57	89	52	16	28	42	12	3	1	0	2	16
Castries	113	76	66	90	114	134	216	291	224	246	243	149
Difference	+56	-13	+15	+74	+86	+91	+204	+289	+223	+246	+241	+133

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Karratha	57	89	52	16	28	42
Castries	113	76	66	90	114	134
Difference	+56	-13	+15	+74	+86	+91

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Karratha	12	3	1	0	2	16
Castries	216	291	224	246	243	149
Difference	+204	+289	+223	+246	+241	+133

Cloud cover (%) Castries runs higher most of the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Karratha	47	50	41	39	39	41	30	21	18	18	21	32
Castries	38	39	42	49	52	59	50	46	51	51	46	41
Difference	-9	-12	+1	+10	+13	+17	+20	+25	+33	+33	+25	+8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Karratha	47	50	41	39	39	41
Castries	38	39	42	49	52	59
Difference	-9	-12	+1	+10	+13	+17

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Karratha	30	21	18	18	21	32
Castries	50	46	51	51	46	41
Difference	+20	+25	+33	+33	+25	+8

Relative humidity (%) Castries runs higher most of the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Karratha	72	74	69	63	60	61	60	60	61	61	64	69
Castries	76	75	75	76	77	79	79	79	79	79	79	77
Difference	+3	+1	+6	+13	+17	+17	+18	+19	+18	+18	+15	+8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Karratha	72	74	69	63	60	61
Castries	76	75	75	76	77	79
Difference	+3	+1	+6	+13	+17	+17

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Karratha	60	60	61	61	64	69
Castries	79	79	79	79	79	77
Difference	+18	+19	+18	+18	+15	+8

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. Karratha trends → · Castries trends →

Methodology & sources

Karratha

Temperature & precipitation — 1991–2020 normals computed from 27 years of daily observations at Karratha Aero, a weather station, about 8 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.

How we build these numbers →

← change Karratha · change Castries → · Karratha page · Castries page