What about those who have chickens in moderate climates that don't experience harsh winters? Last winter, we got enough snow to make a footprint (total for the whole season), but we did have several cold snaps. This year, it's barely hit freezing twice. My hens that do a gradual molt, always molt gradually. Those that are hard molters, are always hard molters. Weather does not have any effect. Any pullets that are over 8 months by October are guaranteed to molt here, the days get so shorter so quickly at that point in the year. It has no relation to the future weather patterns. I have noticed a slight coincidence when it comes to the onset of molting and the lunar and tide cycles though. King tides (slightly closer position of the moon to the earth) tends to increase the odds of a hen starting molt. The west coast just experienced a king tide last week, so any hens that hadn't quite finished dropping feathers prior, did so this past week.