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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 8°C on the annual average; Castries is the wetter, with 812 mm more rain a year, and Castries the sunnier.

Warmer Castries 8°C on the year

Wetter Castries 812 mm more a year

Sunnier Castries 8 pp less cloud

Colder winters Sydney 16°C 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 8°C on the annual average.

Precipitation

Castries is the wetter — about 812 mm 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 (°C) Castries runs higher most of the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sydney	27	27	26	24	21	18	18	19	22	23	24	26
Castries	27	27	27	28	28	28	28	29	29	29	28	27
Difference	—	—	+1	+4	+7	+10	+11	+10	+7	+5	+4	+2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Sydney	27	27	26	24	21	18
Castries	27	27	27	28	28	28
Difference	—	—	+1	+4	+7	+10

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Sydney	18	19	22	23	24	26
Castries	28	29	29	29	28	27
Difference	+11	+10	+7	+5	+4	+2

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sydney	20	20	18	15	12	10	9	10	12	15	17	18
Castries	26	25	25	26	27	27	27	28	28	28	27	26
Difference	+6	+5	+7	+11	+14	+17	+18	+18	+16	+13	+11	+8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Sydney	20	20	18	15	12	10
Castries	26	25	25	26	27	27
Difference	+6	+5	+7	+11	+14	+17

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Sydney	9	10	12	15	17	18
Castries	27	28	28	28	27	26
Difference	+18	+18	+16	+13	+11	+8

Precipitation (mm) Varies through the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sydney	91	132	118	114	101	143	80	75	64	68	91	73
Castries	113	76	66	90	114	134	216	291	224	246	243	149
Difference	+22	-56	-52	-25	+13	-10	+136	+216	+160	+179	+152	+76

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Sydney	91	132	118	114	101	143
Castries	113	76	66	90	114	134
Difference	+22	-56	-52	-25	+13	-10

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Sydney	80	75	64	68	91	73
Castries	216	291	224	246	243	149
Difference	+136	+216	+160	+179	+152	+76

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