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Upper limits: 3,300 hr. sunshine (~75%), precip of 500 mm in a single month, 180 days of precip annually/3,000 mm total precip annually
Lower limits: 1,000 hr. sunshine, and around half the annual evaporation (scaling linearly with annual mean temp from 40% to 60%). Granted, though, the less than 30% of possible sunshine in Pittsburgh winters is enough to drive me crazy on occasion (I have never felt that way in Virginia, where the minimum is 45%)
3000 hours sunshine is Ideal and 3500 is probably my limit.
As with some of the other posters I'm not too concerned about the amount of rain but rather the number of days.
It must be 100 days or less raining for me to be 100% happy. My ideal rainfall total would probably be about 1200mm.
No limit for rainfall totals in themselves as long as the weather is sunny. I'd take 3000 sunshine hours and 2000mm rainfall over 2000 and 500mm.
Ideal would be 3600 and 750mm.
On a slightly off topic note, Hong Kong recorded one of its wettest years in 2013, with 2847mm, despite 3 almost completely dry months (Jan, Feb, Oct) - there were 5 consecutive months with 400mm+ (May to September, with May recording 509mm). Now that's kinda wet.
Sunshine hours max would be about 4000 hours. I like about 25" precipitation as it's enough to keep trees growing but not too much. I've lived in 65" climate in New Orleans versus 38" in Seattle but as someone else mentioned, the number of days it rains is also a factor as in, the less number the better. Seattle rains more days but actually receives less precip.
Rainfall: no more than 700mm (ideally less)
Sunshine: no real upper limit, but a few clouds here and there could break the monotony, so maybe around 3500 hours or so.
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