Personally, I'm just looking for useable gardening days - coinciding with when I'm free! I'll do 8C if its dry and be very glad of that. 15C and rain, well, who can use that? My ground is still absolutely sodden wet. I want my potatoes in, you cannot plant potatoes in mud with the prospect of that mud rotting them.
Weather is never perfect I know.
Models are just a hapless chancers game at this time. Experienced forecasters will use the 72 hour advance rule - and nothing after that is ever certain. ... but these models are supposed to be the bees knees at guidance and, in this day and age, they cannot resolve Springtime weather patterns.... ?