BYC's "Engteacher" has posted many photos of his Black Java hen hatching & raising youngun's in MINNESOTA in the middle of winter..............you can see on the Java thread...I'll see if I can find it.
I sent her a PM to see if she'll send link to her pics.
She had wonderful photos of this Black Java hen, with all these black chicks following...right out of the barn into the snow.
We laughed, cuz when the hen went broody in the first place, it was fall-ish.
When she had hatched her brood and decided to venture out into the world.................it was dead winter...the hen came out, babies in tow, looked at all the deep snow, and went right back inside the barn again !