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Even during winter I try to get some exposure on rare sunny days. The other day we had a very clear day so I sat out on the porch facing the sun for fifteen minutes... in -5c.

Doesn’t sound like a good idea to forego the sunscreen…

He's probably in a colder climate with minimal UV given his/her reference to "in the warmer months"

Why not?

Is UV the sole reason for the generation of Vitamin D?

Vitamin D is found in fish, and milk usually has added vitamin D (so you can use the calcium). If you eat 20 eggs you can get 100% of your daily value of vitamin D from that, but I don't recommend it.

Besides dietary sources you need UVB to make vitamin D: https://en.wikipedia.org/wiki/Cholecalciferol

Same here, hello from the Space Coast!