What are the criteria used in this map? It seems to be an adaptation of Trewartha. SF is maritime? (climate, warmest)

[Kauan Mateus Kubaski]

[psyche_da_mike24]

This isn't Trewartha. The temperature thresholds are completely different; this is actually where I got the idea of using 10°C as the poleward limit for "True Subtropical" from.

http://www.bonap.org/Climate%20Maps/ClimateMaps.html

Alpine/Polar- warmest month <10°C
Boreal- coldest month <0°C, warmest 6 months <12°C
Cool Maritime- coldest month >0°C, warmest 6 months <12°C
Cold Temperate- coldest month <0°C, warmest 6 months 12°C-18°C
Warm Continental- coldest month <0°C, warmest 6 months >18°C
Mild Maritime- coldest month >0°C, warmest 6 months 12°C-18°C
Warm Temperate- coldest month 0°C-9°C, warmest 6 months >18°C
Subtropical- coldest month 9°C-18°C, warmest 6 months >18°C
Tropical- coldest month >18°C

Moisture Index- ratio of annual precip. over annual PET (which is estimated by multiplying the Holridge biotemperature by 58.93 mm/°C without correcting for precip. seasonality)
Arid- ratio < 0.25
Semiarid- 0.25 < ratio < 0.5 [dry for cool maritime and boreal]
Subhumid- 0.5 < ratio < 1
Humid- ratio > 1

[Kauan Mateus Kubaski]

Thank you very much.

I know it was not the Trewartha scheme, but it seemed to follow the same logic as the warm temperate where it would be the northern zone of the subtropical, the wider marine climate in the PNW, a more defined semiarid on the California coast, ie more similar than the definition of Köppen.

The impression I have is a classification of its own, but it has not yet been postulated. Avoid very large areas.

[Isleofpalms85]

Are those climate zones based on the more recent climate normals or the outdated 1971-2000 normals?

[Kauan Mateus Kubaski]

Originally Posted by Isleofpalms85

Are those climate zones based on the more recent climate normals or the outdated 1971-2000 normals?

1971-2000 of the Prisma Group. In the recent normals, the southern New England it should be warm continental.