I'm having this problem right now, trying to plan some nice long walks out of the city but it's been raining a lot lately. I'd love some kind of map of flooding/muddy conditions, but I don't think it would be feasible without a massive effort (as whether an area is prone to flooding or turning into a mudbath after rain depends on a lot of factors).
CARROT has this and it’s amazing! You can “time travel” back as far as you want. Absurdly far, even. I can tell you that it was 20 degrees in my town on Jan 1st, 1940.