The weather is a critical factor for any pilot. For today we were planning ILS and VOR approaches in a controlled airspace.
The forecast was pretty good and even improving: almost no wind, ceiling 4300, visibility 10 miles or more. After all preparations and a preflight check the wind became 190, 4 kt, but we planned runway 36 (the only one with ILS in that airport). It meant that we would have a tailwind, and more likely that all other traffic would use 18, and ILS would not be an option.
So, the only option for a precision approach (the one with a glideslope) could be a GPS approach with LPV, but the airplane we took does not have WAAS. It meant that we just cannot fly any precision approach.
Fortunately the airplane with WAAS was still available, and we decided to prepare a GPS approach. Instrument-wise there is almost no difference between ILS and GPS with a glideslope.
Meanwhile, the weather decided against us again, and the ceiling became 800. Definitely these were not proper conditions for a training flight, especially for the first precision approach ever for me. So we are waiting for appropriate conditions. Sometimes it just happens, and a proper decision is a part of good ADM.