Weather Display > WD Questions

ETP Formula

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Pascal66:
Hi ! What's your ET formula ?
Penmann, Turc, Thorthwaite, Gariepi ?
Depend on region of world, ET is very different..
Turc only for J > 7 and temperate region
Thornthwaite only for avg mensual values
Penmann and Gariepi are the only one wich integrate windspeed

Depend of the region of world using your ET, it's different for more than 150%
Personnaly, Gariepi gave me more accurate results in south of France.
Very far from Australian or Canadian result.

Weather Display:
Penman from memory
if you have a Davis VP then you can set to use that

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