Wwe have gone in both Feb and JAN and like all things it depends waht you want ...
First the
weather is just as nice in both months with Feb it is a little hotter during the days and the evenings get a little cooler however I have never worn anything other than a t shirt at night either time I guess it depends on the person . These are very dry months in PVR I think annually Jan has 1 or 2 wet days and Feb is a about the same .....whenever you go you will have a great time you just burn your feet in the sand more in feb than jAN .
Dont worry have a great trip you picked the absolute best place to go !!!