Roof open/closed status
Issue No. 160
Only relevant for MLB: whether the roof of a stadium was open or closed.
This would only apply to:
Minute Maid Park
There doesn't appear to be a machine-consumable source for whether the roofs of these stadiums will be open beforehand, but it's in the box score that I see on the MLB At Bat™ app.
Some of the websites for the stadiums (but not all of them!) have roof status indicators. Twitter accounts like https://twitter.com/IsTheDomeOpen are useful for what to wear to the ballgame, but they're not automated.