I live in NJ where there is very HOT in summer and there is snow in winter. Are these boards good for such weather ?

Hello, and thank you for your interest in Trex! Our decking boards have been tested to not get any warmer than pressure treated lumber of the same color. And our composite boards with shell coating will hold up great against hot or cold temperatures. If they are installed with the correct gaping they will be able to expand and contract with the varying temperatures and will look great for years! Thank you, Trex Customer Care