Leopards aren't tuned in to the seasons. Mine lay any time of year. I sometimes have to set up a heat lamp over one when she's still laying after it cools down in the evening.
Last time was her first time, and I had to help her lay nine. This time, she didn't need help.Being I was out there with the flashlight, and room heater, I did assist her burying the hole.
Congrats! Leopards don't care what season it is, they will lay all year long.
My leopards always seem to pick the most inconvenient time to lay also. One laid last night as a front was coming through and temps started dropping. finally finihsed and brought her in about 10 pm. Laid 5 nice eggs for her second clutch ever.