The other day my front passenger-side window didn't work. It was as if the switch was disconnected. Neither the switch in the passenger-side door nor the switch in the driver-side door would do anything. I wasn't in a place where it was quiet enough to hear if a relay was clicking or not.
This evening, it worked just fine. When it didn't work, it was about 70 degrees out. This evening it was probably about 60 degrees. Those temps don't seem to be extreme to me.
We've had a few issues where the fronts bind up mechanically. Giving it a good whack can often free it up. If not, taking the door panel off, and removing and reinstalling the motor starts things working. Other times, like yours, it just starts working again on its own.