Code and example for classifying snow effects #1648

Job	Run time
lint (3.7)	7s
test (ubuntu-latest, 3.7)	2m 24s
test (ubuntu-latest, 3.8)	2m 12s
test (ubuntu-latest, 3.9)	2m 11s
test (ubuntu-latest, 3.10)	2m 9s
test (ubuntu-latest, 3.11)	2m 9s
test (ubuntu-latest, 3.12)	2m 39s
test (macos-latest, 3.7)	5m 1s
test (macos-latest, 3.8)	3m 19s
test (macos-latest, 3.9)	2m 31s
test (macos-latest, 3.10)	4m 1s
test (macos-latest, 3.11)	3m 40s
test (macos-latest, 3.12)	5m 3s
test (windows-latest, 3.7)	3m 27s
test (windows-latest, 3.8)	3m 13s
test (windows-latest, 3.9)	3m 30s
test (windows-latest, 3.10)	3m 40s
test (windows-latest, 3.11)	3m 44s
test (windows-latest, 3.12)	4m 3s
test (-r requirements-min.txt, 3.7, ubuntu-latest)	4m 1s
Finish Coveralls	9s
	1h 3m 13s

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