"It's a start." It might not seem like much, but to her this feels like winning a marathon. Teaching someone how to be human is difficult beyond belief, but when she manages to discern even the small things like this it's worthwhile. They're getting there. Slowly, yes, but they're getting there.
She looks momentarily confused when he speaks, and she glances down at her feet briefly before she realises he actually means the weather, and that's something of a relief. When she goes to respond with a quick dismissive wave, he's already handing her his jacket and there's nothing that could stop the quick laughter that escapes - if it could even be called that. It's more of a giggle, and as quickly as it comes she's reeled it back in again, and gotten herself under control once more. She slips her arms into the jacket quickly, shrugs it onto her shoulder and straightens it up briefly before holding her arms out.