In general,most roofs designed and and built in NH are built for substantial snowloads.Flatter pitched roofs should have larger dimensional framing to support more of a load.For the most part you should rarely have to shovel most roofs to protect from overload.More likely roofs edges get raked to try to prevent ice damming.If you have heat cord installed higher up past the overhang of your roof,ice dams are really not a problem because the cord melts a path for the water to escape.Having said all this,I raked my roof right before the X-mas rain worried about the extra load from 2 ft of snow sponging up all that water load.So to each his own.
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SIKSUKR
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