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Sydney vs Castries

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Comparing Sydney change · Castries change

Bottom line

Castries is the warmer of the two — about 15°F on the annual average; Castries is the wetter, with 32 in more rain a year, and Castries the sunnier.

Warmer Castries 15°F on the year

Wetter Castries 32 in more a year

Sunnier Castries 8 pp less cloud

Colder winters Sydney 29°F colder nights

How the seasons compare

The differences between Sydney and Castries, in everyday terms.

Summers

Castries has hotter summers

Sydney: Warm
Castries: Warm

Winters

Castries has far milder winters

Sydney: Cool
Castries: Stays warm

Rain & snow

Castries is wetter

Sydney: Wet
Castries: Very wet

Sky

Castries is sunnier

Sydney: Partly cloudy
Castries: Fairly sunny

Month-by-month charts

Temperature

Castries is the warmer of the two — about 15°F on the annual average.

Precipitation

Castries is the wetter — about 32 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
Sydney	81	80	78	74	70	65	64	67	71	74	76	78
Castries	80	80	80	82	83	83	83	84	84	83	83	81
Difference	—	—	+2	+7	+13	+18	+19	+17	+13	+10	+7	+3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Sydney	81	80	78	74	70	65
Castries	80	80	80	82	83	83
Difference	—	—	+2	+7	+13	+18

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Sydney	64	67	71	74	76	78
Castries	83	84	84	83	83	81
Difference	+19	+17	+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
Sydney	68	68	65	60	54	50	48	49	54	58	62	65
Castries	78	77	78	79	80	81	81	82	82	82	81	79
Difference	+10	+10	+13	+19	+26	+31	+33	+32	+28	+23	+19	+14

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Sydney	68	68	65	60	54	50
Castries	78	77	78	79	80	81
Difference	+10	+10	+13	+19	+26	+31

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Sydney	48	49	54	58	62	65
Castries	81	82	82	82	81	79
Difference	+33	+32	+28	+23	+19	+14

Precipitation (in) Varies through the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sydney	3.6	5.2	4.6	4.5	4	5.6	3.2	3	2.5	2.7	3.6	2.9
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	+0.9	-2.2	-2	-1	+0.5	-0.4	+5.3	+8.5	+6.3	+7	+6	+3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Sydney	3.6	5.2	4.6	4.5	4	5.6
Castries	4.5	3	2.6	3.5	4.5	5.3
Difference	+0.9	-2.2	-2	-1	+0.5	-0.4

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Sydney	3.2	3	2.5	2.7	3.6	2.9
Castries	8.5	11.5	8.8	9.7	9.6	5.9
Difference	+5.3	+8.5	+6.3	+7	+6	+3

Cloud cover (%) Varies through the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sydney	61	61	59	53	53	56	49	44	47	56	63	61
Castries	38	39	42	49	52	59	50	46	51	51	46	41
Difference	-22	-23	-17	-4	-1	+3	+1	+2	+4	-4	-17	-21

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Sydney	61	61	59	53	53	56
Castries	38	39	42	49	52	59
Difference	-22	-23	-17	-4	-1	+3

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Sydney	49	44	47	56	63	61
Castries	50	46	51	51	46	41
Difference	+1	+2	+4	-4	-17	-21

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sydney	75	76	75	73	72	75	73	70	69	70	73	73
Castries	76	75	75	76	77	79	79	79	79	79	79	77
Difference	+1	-2	—	+3	+5	+4	+6	+9	+9	+9	+6	+3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Sydney	75	76	75	73	72	75
Castries	76	75	75	76	77	79
Difference	+1	-2	—	+3	+5	+4

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Sydney	73	70	69	70	73	73
Castries	79	79	79	79	79	77
Difference	+6	+9	+9	+9	+6	+3

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. Sydney trends → · Castries trends →

Both cities' Köppen climate types are projected to hold steady through 2099 (SSP2-4.5).

Methodology & sources

Sydney

Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Sydney (observatory Hill), a weather station, inside the city. 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 Sydney · change Castries → · Sydney page · Castries page