I mean, I think there's a difference between looking at the forecasts today and coming to a reasonable expectation that you won't need layers upon layers of throw aways at the starting line AND looking at the forecast and trying to decide which socks to wear....you're 64 degree swift wicks or your 61 degree smartwools
What we can learn today is that the chance of a winter blast is highly unlikely so it makes packing easier which may lead to decision about what car to drive to the airport to fit luggage or what carry-on to use or how to get back to the airport since there is no DME. I think considerations for pre, post and race nutrition should shift as well and maybe with avg to higher temps, details can be worked out for extra cases of water to someones room/resort, etc. Rain, I wouldnt worry about that at all and thats just something you hav to prepare for no matter what but certainly I think value can be had 2-3 weeks out.