My neuropathy (not B12 related) includes some Raynaud's-like symptoms. In the cold weather (less than about 20°C) my fingers become cold, numb and wrinkled. In this hot weather it's a lot better.
Maybe your levels of vitamin D increased from sun exposure?
Just did a very quick search and found a BMJ article saying that symptoms of diabetic neuropathy (not suggesting you're diabetic) were greatly helped by a large dose of vitamin D in a study, for example.
The same thing happened to me years ago after a rare holiday in the sun. Felt I was back to normal for a few weeks. However now I'm heat intolerant (brings on migraine and intense fatigue) so must be very careful.
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