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Castries vs Hanoi

Af Tropical rainforestCwa Monsoon-influenced humid subtropical

Comparing Castries change · Hanoi change

Bottom line

Castries is the warmer of the two — about 5°F on the annual average; Castries is the wetter, with 21 in more rain a year, and Castries the sunnier.

Warmer Castries 5°F on the year

Wetter Castries 21 in more a year

Sunnier Castries 27 pp less cloud

Colder winters Hanoi 20°F colder nights

How the seasons compare

The differences between Castries and Hanoi, in everyday terms.

Summers

Hanoi has much hotter summers

Castries: Warm
Hanoi: Hot

Winters

Castries has much milder winters

Castries: Stays warm
Hanoi: Mild

Rain & snow

Castries is wetter

Castries: Very wet
Hanoi: Wet

Sky

Castries is far sunnier

Castries: Fairly sunny
Hanoi: Often grey

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 21 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) Varies through the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Castries	80	80	80	82	83	83	83	84	84	83	83	81
Hanoi	68	71	75	83	90	93	92	91	90	86	80	72
Difference	-12	-9	-6	+1	+7	+10	+9	+7	+6	+2	-3	-9

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Castries	80	80	80	82	83	83
Hanoi	68	71	75	83	90	93
Difference	-12	-9	-6	+1	+7	+10

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Castries	83	84	84	83	83	81
Hanoi	92	91	90	86	80	72
Difference	+9	+7	+6	+2	-3	-9

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Castries	78	77	78	79	80	81	81	82	82	82	81	79
Hanoi	57	60	65	71	76	79	79	78	77	72	66	59
Difference	-21	-17	-13	-8	-4	-2	-2	-3	-5	-10	-15	-20

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Castries	78	77	78	79	80	81
Hanoi	57	60	65	71	76	79
Difference	-21	-17	-13	-8	-4	-2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Castries	81	82	82	82	81	79
Hanoi	79	78	77	72	66	59
Difference	-2	-3	-5	-10	-15	-20

Precipitation (in) Varies through the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Castries	4.5	3	2.6	3.5	4.5	5.3	8.5	11.5	8.8	9.7	9.6	5.9
Hanoi	1.2	0.9	2	3.7	7.1	8	10.3	10.6	5.9	3.5	2	0.9
Difference	-3.3	-2	-0.6	+0.2	+2.6	+2.8	+1.8	-0.9	-2.9	-6.2	-7.5	-5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Castries	4.5	3	2.6	3.5	4.5	5.3
Hanoi	1.2	0.9	2	3.7	7.1	8
Difference	-3.3	-2	-0.6	+0.2	+2.6	+2.8

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Castries	8.5	11.5	8.8	9.7	9.6	5.9
Hanoi	10.3	10.6	5.9	3.5	2	0.9
Difference	+1.8	-0.9	-2.9	-6.2	-7.5	-5

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Castries	38	39	42	49	52	59	50	46	51	51	46	41
Hanoi	73	76	79	80	79	85	85	81	70	62	60	64
Difference	+34	+38	+38	+31	+27	+26	+35	+34	+19	+11	+14	+24

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Castries	38	39	42	49	52	59
Hanoi	73	76	79	80	79	85
Difference	+34	+38	+38	+31	+27	+26

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Castries	50	46	51	51	46	41
Hanoi	85	81	70	62	60	64
Difference	+35	+34	+19	+11	+14	+24

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Castries	76	75	75	76	77	79	79	79	79	79	79	77
Hanoi	80	79	79	77	80	83	84	85	85	83	81	79
Difference	+5	+5	+4	+1	+2	+5	+6	+7	+6	+4	+2	+2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Castries	76	75	75	76	77	79
Hanoi	80	79	79	77	80	83
Difference	+5	+5	+4	+1	+2	+5

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Castries	79	79	79	79	79	77
Hanoi	84	85	85	83	81	79
Difference	+6	+7	+6	+4	+2	+2

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. Castries trends → · Hanoi trends →

Methodology & sources

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.

Hanoi

Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Noibai Intl, a weather station, about 22 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →

← change Castries · change Hanoi → · Castries page · Hanoi page