Every powder is different, some powders get "hotter" as temps cool which is the opposite of conventional thinking.
Do some googling of the temp sensitivity of the powder you are using and then test for yourself.
Unless you are right on maximum or using some very temp sensitive powder you really shouldn't see big differences in NZ climate.
Even if you said average 5 degc winter and 25deg summer that is still only a 20 deg spread.
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