Why is this part of the Southeast Oceanic climate according to the Köppen map?

[General Sylvester D. Palm 120]

So I see a small area that spans into multiple states (Mostly North Carolina, a tad in South Carolina, Tennessee and Georgia) that is an Oceanic climate according to the Köppen Climate Classification Map. What is causing this? It seems odd that all of the surrounding area is Humid Subtropical Climate. Also, could this mean that some different palms could live here (with protection obviously)?

[General Sylvester D. Palm 120]

I forgot to add the link to the map. https://www.plantmaps.com/koppen-climate-classification-map-united-states.php

[Jimbean 928]

I has to do with average monthly temperature and rainfall amount. 

CFA: "Coldest month averaging above 0 °C (32 °F) and at least one month's average temperature above 22 °C (71.6 °F) and at least four months averaging above 10 °C (50 °F). No significant precipitation difference between seasons (neither abovementioned set of conditions fulfilled)."

 

CFB: "Coldest month averaging above 0 °C (32 °F), all months with average temperatures below 22 °C (71.6 °F), and at least four months averaging above 10 °C (50 °F). No significant precipitation difference between seasons (neither abovementioned set of conditions fulfilled)."

 

The only palm that might grow there is Sabal minor. 

[General Sylvester D. Palm 120]

2 hours ago, Jimbean said:

I has to do with average monthly temperature and rainfall amount. 

CFA: "Coldest month averaging above 0 °C (32 °F) and at least one month's average temperature above 22 °C (71.6 °F) and at least four months averaging above 10 °C (50 °F). No significant precipitation difference between seasons (neither abovementioned set of conditions fulfilled)."

 

CFB: "Coldest month averaging above 0 °C (32 °F), all months with average temperatures below 22 °C (71.6 °F), and at least four months averaging above 10 °C (50 °F). No significant precipitation difference between seasons (neither abovementioned set of conditions fulfilled)."

 

The only palm that might grow there is Sabal minor. 

That is interesting. Thanks for commenting.

[Teegurr 437]

5 hours ago, Jimbean said:

I has to do with average monthly temperature and rainfall amount. 

CFA: "Coldest month averaging above 0 °C (32 °F) and at least one month's average temperature above 22 °C (71.6 °F) and at least four months averaging above 10 °C (50 °F). No significant precipitation difference between seasons (neither abovementioned set of conditions fulfilled)."

 

CFB: "Coldest month averaging above 0 °C (32 °F), all months with average temperatures below 22 °C (71.6 °F), and at least four months averaging above 10 °C (50 °F). No significant precipitation difference between seasons (neither abovementioned set of conditions fulfilled)."

 

The only palm that might grow there is Sabal minor. 

Trachycarpus sounds like a good choice.

Maybe a bit cold, though (hardiness zone 6b/7a)

Edited October 15, 2021 by Teegurr

[Geoff58 10]

Were you looking at the green oval southwest of Asheville NC and the V-shaped green area in the Appalachians? Aren't these areas just higher elevations with cooler summers?