Yeah, that makes sense. I was tripped up a bit because "march is warmer" sounds to me like an effect, not a cause - and it becomes paradoxical if there is a mas

Yeah, that makes sense. I was tripped up a bit because "march is warmer" sounds to me like an effect, not a cause - and it becomes paradoxical if there is a massive cold front underway at the same time. But if they mean, there are other seasonal factors - such as daylight - that counteract the cold spell, which aren't there in winter, it makes more sense.