P SR "62 degrees Fahrenheit is the minimum temperature required for a grasshopper to be able to hop."
I think you are onto something there, as in Memphis it must have been at least 62 F and McIlroy sure has a problem on his hands when the temperature reaches 62 F in San Fran, as his driver is liable to start hopping up and down and jump out of his hands again, and hop a few feet in front of him, and them back, up and down 4 times, so as to save his master from getting fined by the PGA.