
You can only count on a max of 1 egg per hen per day. Since it's cooled off a bit, they should get a little more regular at laying. I'm a little north of you and the heat did slow my girls down, but they did continue to lay.
You may also want to put a light in the coop (on a timer) to bring the amount of "daylight" back up to 12 - 14 hours to keep them laying over the winter.