The C150's Continental engine is VERY prone to carb icing. I had obvious symptoms of icing (rpm getting gradually lower etc) at some time in every phase of flight except with full power for the climb.
I flew your C150 many years ago at Cambridge and had classic carb icing in a full power climb one morning. Carb heat was applied but it took a while to get rid of the stuff.
There was no extended time on ground before departure - no icing was noted during the engine run - and full power was giving healthy rpm on take off. As we climbed through 1500ft rpm started to fall off very quickly indeed and carb heat applied. At 2500ft the icing stopped and carb heat was cancelled. I recall it was a damp November morning but no different (to my eyes) from the previous few days when flying was unaffected.
It is the only time in 35 years that I experienced icing on take off. It's obviously rare - but it
can happen.