New Climate Normals (1991-2020)

[kinzyjr]

@Jimbean Nice map.  I remember from a conversation in days gone by that you had a formula that put more weight on the Record Low for each of the areas.  I took a guess at how something like this would work and came up with the following:

The attached sheet assigns a score for the USDA zone of both the average low and the record low from the chart above, and then takes the average of the two zones.  If you end up with a score that puts you between zones, then you get a dashed "transition zone".  For example, the Lakeland Airport (KLAL) has an average low of 29F and a record low of 20F.  The average is 9b (6 points) and the record low zone is 9a (5 points).  To get the average of the two scores: 6 + 5 / 2 = 5.5

This would yield a 9a-9b zone for the airport.  Was this relatively close to what you did?

20210917_ReliableZones_upl.xlsx

[palmsOrl]

I like it Jeremy.  Thank you for taking the time to come up with it though it is quite analytical.

God Bless the USA

-Michael

[clinenotklein]

Not to ressurrect the thread, but this inspired me to do one here based off of a happy medium between 1991-2020 averages, personal observation, (which made me do higher or lower in certain areas), and some educated guesses from trends in how the lines go from known areas to fill it in. Definitely in agreement with a narrow band of 9b above Florida and it probably terminates in extreme coastal Charleston County, SC. 

https://www.google.com/maps/d/edit?mid=1HHQbCcLVZkxooXPD1H4XC1oWRV8TPbA&fbclid=IwAR0_wNWuCvzHHCzeflSoTdT8MKzZpqR1PyCtRlO7T3KTqyDauBBuBiM5KlU&ll=31.325495808975415%2C-80.68797249999999&z=7

[Jimbean]

4 hours ago, clinenotklein said:

Not to ressurrect the thread, but this inspired me to do one here based off of a happy medium between 1991-2020 averages, personal observation, (which made me do higher or lower in certain areas), and some educated guesses from trends in how the lines go from known areas to fill it in. Definitely in agreement with a narrow band of 9b above Florida and it probably terminates in extreme coastal Charleston County, SC. 

https://www.google.com/maps/d/edit?mid=1HHQbCcLVZkxooXPD1H4XC1oWRV8TPbA&fbclid=IwAR0_wNWuCvzHHCzeflSoTdT8MKzZpqR1PyCtRlO7T3KTqyDauBBuBiM5KlU&ll=31.325495808975415%2C-80.68797249999999&z=7

I enjoy looking at these maps, but at a glance it looks too liberal. 

[clinenotklein]

6 hours ago, Jimbean said:

I enjoy looking at these maps, but at a glance it looks too liberal. 

The "liberal" areas have microclimates in the opposite direction, and the 9b areas above florida (along with the 10a band to Anasasia Island) could easily go with the caveat that microclimates may occur. It's still less liberal than 1991-2020 data, which is too liberal in light of extreme events.  

Edited November 1, 2022 by clinenotklein