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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 3°C on the annual average; Castries is the wetter, with 536 mm more rain a year, and Castries the sunnier.

Warmer Castries 3°C on the year

Wetter Castries 536 mm more a year

Sunnier Castries 27 pp less cloud

Colder winters Hanoi 11°C 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 3°C on the annual average.

Precipitation

Castries is the wetter — about 536 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) Varies through the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Castries	27	27	27	28	28	28	28	29	29	29	28	27
Hanoi	20	22	24	28	32	34	34	33	32	30	26	22
Difference	-7	-5	-3	+1	+4	+6	+5	+4	+3	+1	-2	-5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Castries	27	27	27	28	28	28
Hanoi	20	22	24	28	32	34
Difference	-7	-5	-3	+1	+4	+6

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Castries	28	29	29	29	28	27
Hanoi	34	33	32	30	26	22
Difference	+5	+4	+3	+1	-2	-5

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Castries	26	25	25	26	27	27	27	28	28	28	27	26
Hanoi	14	16	18	22	24	26	26	26	25	22	19	15
Difference	-11	-9	-7	-4	-2	-1	-1	-2	-3	-5	-8	-11

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Castries	26	25	25	26	27	27
Hanoi	14	16	18	22	24	26
Difference	-11	-9	-7	-4	-2	-1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Castries	27	28	28	28	27	26
Hanoi	26	26	25	22	19	15
Difference	-1	-2	-3	-5	-8	-11

Precipitation (mm) Varies through the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Castries	113	76	66	90	114	134	216	291	224	246	243	149
Hanoi	31	24	51	94	181	204	263	268	150	90	51	22
Difference	-83	-52	-15	+4	+67	+70	+46	-23	-74	-156	-192	-128

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Castries	113	76	66	90	114	134
Hanoi	31	24	51	94	181	204
Difference	-83	-52	-15	+4	+67	+70

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Castries	216	291	224	246	243	149
Hanoi	263	268	150	90	51	22
Difference	+46	-23	-74	-156	-192	-128

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