Then the ride won't run due to high winds.
Then prepare yourself for a potential rollback.
Coasters are created to run in particular temps. It can be too cold to start particular coasters but once the temp rises, and the coaster has been running, it can operate till a lower than start temp. But we are talking about temps in the 30's so this coaster will not have that issue.
Again, prepare for a potential rollback.
Actually no. None of the scenarios you presented gives cause for launching a coaster faster than it needs to be launched. Quite the contrary, the goal is to operate at as less of capacity than needed to conserve energy and wear.
Correct. But it also correlates with other factors like weight of train.
Good guess. It generally means, with all things considered, 70 is the max speed it would need to successfully clear the top.