Do not rely on weather broadcast.
Check the temperature and humidity at your growing spot with thermometer and hygrometer. Look the one with high accuracy.
Compare the average day temperature (not highest) and average night temperature (not lowest).
ok. so one last thing: based on all of the information that was provided in this thread (climate, involved humidity system and protection when needed, etc. ) can everybody please vote for one species out of the three (nepenthes burbidgeae, palawanensis, clipeata) which he thinks will grow best here and describe a little why he thinks so? the one which gets the most votes will be the one I buy. Thank you everybody who have taken part of this thread!