This has a reference to how I got taught which months have 31 days: knuckles (31) vs space between knuckles (30/28) days. As between July and August you have to

This has a reference to how I got taught which months have 31 days: knuckles (31) vs space between knuckles (30/28) days. As between July and August you have to skip hands, that's the only two months in succession with 31 days.