Being familiar with New England winters and summers, either 13 or 16 will do you just fine. Depends on which one you like the feel of better. I've got a 13 that holds its shape well and is more than substantial enough to hold up to a NE winter. But it's also not so heavy that it's unbearable in the humidity and heat of the summer. Do some comparison. The folks here are a wealth of knowledge, but when it comes right down to it...pick what you feel comfortable in.
Personally I would go with the heavier weight as mentioned previously. With it being "too hot" Ive worn a 22 oz wool kilt from time to time in the summer without any real problems.
From the Cape Fear River Valley, NC I can only add that I went with the 13 oz wool on the advice of several long time kilt wearers here. Our Pipe band uses 16 oz.
I seem to remember the NH winters as rather brutal, but the 13 oz should be OK
The pipes are calling, resistance is futile. - MacTalla Mor
from "Karst Kountry" . . beautiful Central Kentucky, USA
I can only add that I went with the 13 oz wool on the advice of several long time kilt wearers here. Our Pipe band uses 16 oz. 
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