I did mine when it was about 85-90 outside and it made getting all the clips to pop in and out a breeze. I too removed the bumper.
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2015 Altitude - Billet Silver
SRT Springs, Taillight Bezels, Red Start Button, Pedals & Grille Mesh, Black Lugs,
Mopar 4" Chrome exhaust tips, 1.25" Bora Wheel Spacers, DDM 5500k HID,
Red LED 3157 Bulbs, 15% Tint, Polk DB Center Channel, Mopar All Weather Mats