The above is very good advise and very interesting... I am also a fairly fresh ppl and fly regularly and for at the stage of my flying I seem to be at the point where:
*15 knots cross wind or gusting at 20 or above is a no go
*Anything below 1800 feet (cross country) feels too low (even if it is above the "safe height")
*Vis of less than 8km isn't good enough for anything. 8-10km is fine for me, but 9999 has to be showing to take friends/family and in reality needs to be much more than this for good site seeing.
*If the weather pattern is on my marginals and the forecast is anything other than improving or if there is a worsening trend then it isn't flyable.
There have been a few days this year where I have been unsure about the weather and have taken the view that if I take off and don't like it, I can land straight back. With the decision being made whilst still in sight of the airfield.
I haven't turned back yet, but am always totally prepared to if it doesn't feel right.
But it is all very personal...