The sticky bit. Relative Humidity is relative to temperature. Ball pythons need 60% @ 80ºF ambient to shed this is 15.5 gm/m3 of water in the air. This is absolute figure.
RH is the % the amount of water the air has relative to the max amount of water the air can hold. Warm air holds more water. If you live up north the air at 90%RH and 0% rh is so close to the same as to make no difference.
75ºF BPs need RH of 72% to shed properly. (15.5 gm/m3 same amount of water as 80ºF @ 60%)
77ºF BPs need RH of 68% to shed properly. (15.5 gm/m3 same amount of water as 80ºF @ 60%)
80ºF they need 60%
82ºF BPs need RH of 57% to shed properly. (15.5 gm/m3 same amount of water as 80ºF @ 60%)
84ºF BPs need RH of 53% to shed properly. (15.5 gm/m3 same amount of water as 80ºF @ 60%)
88ºF BPs need RH of 47% to shed properly. (15.5 gm/m3 same amount of water as 80ºF @ 60%)
Often people in warmer areas fret about getting 60% but it is not always so concerning. Most of my enclosures are kept at 83ºF ambient and I run 50% RH all the time and just bump it up to 55% for sheds no problems ever.