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Castries vs San Diego

Af Tropical rainforestBSk Cold semi-arid

Comparing Castries change · San Diego change

Bottom line

Castries is the warmer of the two — about 10°C on the annual average; Castries is the wetter, with 1744 mm more rain a year, and Castries the sunnier.

Warmer Castries 10°C on the year
Wetter Castries 1744 mm more a year
Sunnier Castries 11 pp less cloud
Colder winters San Diego 17°C colder nights

How the seasons compare

The differences between Castries and San Diego, in everyday terms.

Summers

Castries has much hotter summers

Castries: Warm
San Diego: Mild

Winters

Castries has far milder winters

Castries: Stays warm
San Diego: Cool

Rain & snow

Castries is much wetter

Castries: Very wet
San Diego: Very dry

Sky

Castries is sunnier

Castries: Fairly sunny
San Diego: Partly cloudy

Month-by-month charts

Temperature

Castries is the warmer of the two — about 10°C on the annual average.

0°10°20°30°40° JanAprJulOct CastriesSan Diego

Precipitation

Castries is the wetter — about 1744 mm more across the year.

PRECIPITATION (mm) 0150300 JanAprJulOct CastriesSan Diego

Clear skies

Castries has the clearer skies — the higher line.

0%25%50%75%100% JanAprJulOct CastriesSan Diego

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
JanFebMarAprMayJunJulAugSepOctNovDec
Castries272727282828282929292827
San Diego201919192021232424232119
Difference-7-8-8-8-8-7-6-5-5-6-7-8
Jan – JunJanFebMarAprMayJun
Castries272727282828
San Diego201919192021
Difference-7-8-8-8-8-7
Jul – DecJulAugSepOctNovDec
Castries282929292827
San Diego232424232119
Difference-6-5-5-6-7-8
Avg low (°C) Castries runs higher most of the year
JanFebMarAprMayJunJulAugSepOctNovDec
Castries262525262727272828282726
San Diego991111141618181714108
Difference-17-17-15-15-13-11-10-9-11-14-17-18
Jan – JunJanFebMarAprMayJun
Castries262525262727
San Diego9911111416
Difference-17-17-15-15-13-11
Jul – DecJulAugSepOctNovDec
Castries272828282726
San Diego18181714108
Difference-10-9-11-14-17-18
Precipitation (mm) Castries runs higher most of the year
JanFebMarAprMayJunJulAugSepOctNovDec
Castries113766690114134216291224246243149
San Diego4353471532814112011
Difference-70-22-19-75-111-132-208-291-220-236-222-138
Jan – JunJanFebMarAprMayJun
Castries113766690114134
San Diego4353471532
Difference-70-22-19-75-111-132
Jul – DecJulAugSepOctNovDec
Castries216291224246243149
San Diego814112011
Difference-208-291-220-236-222-138
Cloud cover (%) San Diego runs higher most of the year
JanFebMarAprMayJunJulAugSepOctNovDec
Castries383942495259504651514641
San Diego515658556673696156534648
Difference+12+18+16+6+14+14+19+15+5+2—+7
Jan – JunJanFebMarAprMayJun
Castries383942495259
San Diego515658556673
Difference+12+18+16+6+14+14
Jul – DecJulAugSepOctNovDec
Castries504651514641
San Diego696156534648
Difference+19+15+5+2—+7
Relative humidity (%) Castries runs higher most of the year
JanFebMarAprMayJunJulAugSepOctNovDec
Castries767575767779797979797977
San Diego656869676864595658605963
Difference-11-7-6-9-9-15-20-23-21-20-20-14
Jan – JunJanFebMarAprMayJun
Castries767575767779
San Diego656869676864
Difference-11-7-6-9-9-15
Jul – DecJulAugSepOctNovDec
Castries797979797977
San Diego595658605963
Difference-20-23-21-20-20-14

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 → · San Diego trends →

San Diego from BSk to BSh.

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.

San Diego

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Imperial Beach Ream Fld Nas (NOAA GHCN station USW00093115), about 17 km from the city centre.

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.

How we build these numbers →

← change Castries · change San Diego → · Castries page · San Diego page