Here in the far north our temperatures remain warmer than the rest of the country and Northland (the area I live in) is even nicknamed "the Winterless North". In reality it's not winterless and does get cold, however our temperatures certainly remain warmer than the more southern parts of the country where sometimes they have snow. We never have snow although, on rare occasions, we might get hail.
For now, late March/early April, our daytime temperatures sit at around 20-22C (68-72F) and there are still a few butterflies about.
A couple of days ago I had a visit from two Common Blue Butterflies (Zizina otis labradus) a male and a female. They arrived suddenly. She laid a few eggs on the sprouting tiny new leaves of Birdsfoot Trefoil that I grow for them, while he hovered about. The Birdsfoot Trefoil at our place has long finished for the year and I have cut the old plants away, however it always self-seeds right back into the same spot and there are already tiny leaves sprouting. I can only hope the eggs will remain in diapause until Spring, because there are certainly not enough leaves to sustain the appetites of growing caterpillars.