What do you consider bad weather for riding?

[RoadRaven]

The wind is the biggest predictor of whether I will ride or not.

The Spring westerly here is often gale-force, and not only is that damn dangerous, it also means a head wind climbing back home.

The second biggest predictor is rain - too much and its too dangerous on my slicks to ride (remember I have to descend/climb 600' to get anywhere or get back home) plus its difficult to see... plus if there's a winter chill factor involved, nah... I don't have the cold weather gear some of you gals have, besides, I don't like the cold and (I'm with five one on this.....) cycling is supposed to be fun - yeah?

Heat? 38'C (thats just over 100'F Eros) is about the hottest I have ridden in - and that was last week. There was a nice breeze coming up the valley, so that prolly made a huge difference.
That was midday and usually I avoid/minimise riding in summer between 10am and 2pm because of the UV. So I may not find out if I can ride in anything hotter...