I don't know how much colder it gets in Ohio then NJ, but we get zero often enough, with 10-20F being common in winter. In all my 60+ years we've never had a problem with NG service. Maybe it's because nearly every house and business in NJ uses it, IDK.
When we lost our summer home at the shore to Sandy we rebuilt and I brought the NG load to the gas company, they told me a 2"-2.5" line into the house was what we needed. The 2" line was enough but on the chance that I'd want to add a NG fireplace in the future they said go with the 2.5" line.
We had a Hot forced air NG heat (1,250 sq ft house), 2 bath tankless hot water and stove/oven.