91.175(d) says you may not land below the minimums for the approach... but who determines the weather when in flight, I believe that would be the pilot, you may not begin approaches when the weather is below minimums under 135, you may go up to the FAF under 121 (or land off a visual if it's a 1/2 mile at least assuming a local obscuration), you may go past the FAF 121 if the weather is at least minimums and then you are required to determine if the weather is legal when you are at the MAP/VDP/DH etc. etc. and determine if it is legal to land.
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