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Heidelberg vs Castries

Cfb Oceanic / temperateAf Tropical rainforest

Comparing Heidelberg change · Castries change

Bottom line

Castries is the warmer of the two — about 18°C on the annual average; Castries is the wetter, with 1336 mm more rain a year, and Castries the sunnier.

Warmer Castries 18°C on the year

Wetter Castries 1336 mm more a year

Sunnier Castries 23 pp less cloud

Colder winters Heidelberg 27°C colder nights

How the seasons compare

The differences between Heidelberg and Castries, in everyday terms.

Summers

Castries has much hotter summers

Heidelberg: Mild
Castries: Warm

Winters

Castries has far milder winters

Heidelberg: Cold
Castries: Stays warm

Rain & snow

Castries is much wetter

Heidelberg: Moderate rainfall
Castries: Very wet

Sky

Castries is far sunnier

Heidelberg: Often cloudy
Castries: Fairly sunny

Month-by-month charts

Temperature

Castries is the warmer of the two — about 18°C on the annual average.

Precipitation

Castries is the wetter — about 1336 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
Heidelberg	2	4	8	14	18	21	24	23	18	12	7	3
Castries	27	27	27	28	28	28	28	29	29	29	28	27
Difference	+24	+23	+19	+14	+10	+7	+5	+6	+11	+16	+22	+24

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Heidelberg	2	4	8	14	18	21
Castries	27	27	27	28	28	28
Difference	+24	+23	+19	+14	+10	+7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Heidelberg	24	23	18	12	7	3
Castries	28	29	29	29	28	27
Difference	+5	+6	+11	+16	+22	+24

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Heidelberg	-2	-1	2	5	9	12	14	14	11	7	2	-1
Castries	26	25	25	26	27	27	27	28	28	28	27	26
Difference	+27	+26	+24	+21	+18	+15	+13	+14	+17	+21	+25	+27

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Heidelberg	-2	-1	2	5	9	12
Castries	26	25	25	26	27	27
Difference	+27	+26	+24	+21	+18	+15

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Heidelberg	14	14	11	7	2	-1
Castries	27	28	28	28	27	26
Difference	+13	+14	+17	+21	+25	+27

Precipitation (mm) Castries runs higher most of the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Heidelberg	49	45	43	38	59	56	58	57	50	54	52	65
Castries	113	76	66	90	114	134	216	291	224	246	243	149
Difference	+64	+31	+23	+51	+55	+77	+158	+234	+174	+193	+191	+85

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Heidelberg	49	45	43	38	59	56
Castries	113	76	66	90	114	134
Difference	+64	+31	+23	+51	+55	+77

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Heidelberg	58	57	50	54	52	65
Castries	216	291	224	246	243	149
Difference	+158	+234	+174	+193	+191	+85

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Heidelberg	74	73	70	67	69	70	66	64	65	71	78	77
Castries	38	39	42	49	52	59	50	46	51	51	46	41
Difference	-36	-35	-29	-17	-17	-11	-16	-18	-14	-20	-32	-36

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Heidelberg	74	73	70	67	69	70
Castries	38	39	42	49	52	59
Difference	-36	-35	-29	-17	-17	-11

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Heidelberg	66	64	65	71	78	77
Castries	50	46	51	51	46	41
Difference	-16	-18	-14	-20	-32	-36

Relative humidity (%) Varies through the year

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Heidelberg	93	90	84	77	74	68	63	64	71	83	91	94
Castries	76	75	75	76	77	79	79	79	79	79	79	77
Difference	-17	-15	-9	-1	+3	+11	+15	+15	+8	-3	-12	-17

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Heidelberg	93	90	84	77	74	68
Castries	76	75	75	76	77	79
Difference	-17	-15	-9	-1	+3	+11

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Heidelberg	63	64	71	83	91	94
Castries	79	79	79	79	79	77
Difference	+15	+15	+8	-3	-12	-17

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. Heidelberg trends → · Castries trends →

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

Methodology & sources

Heidelberg

Temperature & precipitation — 1991–2020 normals computed from 30 years of daily observations at Weinbiet, a weather station, about 41 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 Heidelberg · change Castries → · Heidelberg page · Castries page