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Maps will actually display NYC as Cfa, most maps I've seen don't, even though NYC is comfortably within the Cfa range.
NYC is Cfa but borderline. With a January mean temp of 32.7 using JFK. Same thing for philly, both are Cfa but on the northern periphery. Anywhere immediately north or west of both cities is humid continental. Using the 1991-2016 averages JFK warms by .4 degrees in January from 32.7 to 33.1. Not bad! Chicago is veryyyyyyyy far from being Cfa with a January mean of 23 degrees. No where near the 32 degree minimum. For Raleigh our mean temp in January warms to 41.4 for the 1991-2016 period. Average high jumps a degree though! I'm solid Cfa of course but all the new averages achieve for me is Humid subtropical classification under firebirdcamaros climate classification system!
Portsmouth's driest month has 5.4 days of rain vs 11.2 in the wettest. Days of rain do not mean a thing in the Koppen classification, though.
To make a Csb climate you take a Cfb climate, and make the driest summer month 3x drier than the wettest winter month, and under 30mm precip. That is all there is to a Csb.
Between May-August, Portsmouth has 991 hours of sun, 26 precip days, 143mm precip.
Between Oct-Jan there are 333 hours of sun, 44 precip days, 298mm precip.
I'm using Met Office figures which are showing 6.9 days compared to 12.2 days - not a significant seasonal change imo.
Portsmouth also has a summer month with greater rainfall than a winter month -it's kind of tricky to spin that into a clearly defined wet season/dry season scenario.
Csb should really only apply to climates where sustained high pressure is a feature.
I'm using Met Office figures which are showing 6.9 days compared to 12.2 days - not a significant seasonal change imo.
Portsmouth also has a summer month with greater rainfall than a winter month -it's kind of tricky to spin that into a clearly defined wet season/dry season scenario.
Csb should really only apply to climates where sustained high pressure is a feature.
The differences between the two stations is likely just some minor rain shadow effect, which I think probably explains any slight tendency towards Csb characteristics,
There is no way a Csb climate can have a summer month that is wetter than a winter month.
Barcelona is Csa but is wetter in August than any winter month, with June wetter than February.
I don't consider Barcelona Cwa either, with 14 days of rain in summer compared to 18 days of rain in winter, and with the two driest and two wettest months all occurring in a five month period.
It does at least have the wettest month at nearly 4X the rain of the driest month.
2076-2100 parts of the UK medittaranean???? Csb in the UK??????? Lots of eastern Canada is Cfa????? Toronto and most of Michigan Cfa????
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