By Peter in Gilford, NH on 5/18/2006
I'm building a house in central NH. The snow load I used was 90 for Gilford, NH. Each town has a different snow load. Thats likely why you're getting different answers. You can call the local building inspector and he will know the answer for your town.
Now if you want to go the extra mile, you might want to read this paper.
It's part of a study to recalculate the snow loads in NH. After all, given climate change, the answer for snow load 50 years ago may or may not be accurate today. In particular, the paper points out that elevation plays a significant part of your snow load calculation. So if your property is located at the top of a ridge, you may wish to increase the snow load, even if your town has a lower snow load.
You will notice a table in the pdf which contains tables of several towns and the maximum snow loads ever achieved. You should take note that Franklin, NH had a 94 psf snow load once.
Having a higher snow load means the framing materials used on the roof must be bigger. In the scale of things, a small cost compared to the whole project. Don't skimp on safety here.
Hope this helps.