I ran into this problem a time or two up in them Wyoming parts. If the ATIS or AWOS/ASOS you have is less than an hour old, you are good to go. Otherwise you need a qualified observer on the ground. This is why airlines like Lakes train ground personel to be qualified wx observers. It is a pain when the weather is clear and a million but it must be done this way per the regs. Also I agree with whoever said that you can just land any way if its the safest option. ie low fuel or whatnot but that goes with anything. Thats when the big book goes out the window and you have to step up to the plate and be a captain.