There is also the approach ban to considder whan making an approach to land i.e. you can not descend lower than 1000ft above the runway unless the minima are above the landing minima.
On a home made approach to an airfield with no met observer, how can you tell what the actual weather is below the cloud you are about to descend into?
Thus unless you can see the weather for yourself i.e. you are below cloud and can assess the visibility by 1000ft you are caught by the approach ban and can't realy even start the approach.
Regards,
DFC