There are 2 wind seasons in Pak Nam Pran: October to January & January to May.
The NE monsoon winds blow from October to January: (12-30 knots). These winds are often stronger than in the thermal season, and often blow all day long. The seas at this time of year can produce big swells - and the offshore sandbars can lift this swell nicely to produce great wave riding conditions.
The thermal winds blow from February to May (12-25 knots). After the north-east monsoon has blown itself out, the conditions revert to benign seas and warm thermal winds drawn in from the south-east. The daily thermal winds typically kick in after 2pm, and continue until after dusk. The wind is smooth & laminar and progressively builds during the afternoon.
The change from monsoonal to thermal winds in January not only brings warmer waters, but also a resculpturing of much of the Gulf coast as the shifting tides reveal new sandbars and lagoons on which to ride. These flat pockets of water come up to waist level and are perfect for learning and /or practising jumps and tricks.
Pak Nam Pran is the most consistent kite spot in the Gulf of Thailand. The kiting is hazard-free (save the odd jellyfish or two in March), and the beaches are huge so you don't have to worry about crowds.