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Pulling the t-stat can actually cause overheating because the coolant flows through the radiator too quickly and can't shed enough heat, plus when the coolant doesn't get up to ~170F within about 10 minutes you'll get a CEL.
215F coolant temps have nothing to do with ambient temps and everything to do with the stock t-stat, that is what these engines typically run at for emissions/efficiency reasons. Installing a 180 t-stat without adjusting the fan temps won't do anything to help low speed/idle coolant temps since the fans won't come on any sooner.
2016 Challenger R/T Scat Pack, B5, 6-speed, SPAG, WRTs, sunroof, SGII, Convenience, Tech and Leather; UPR catch can, skip-shift eliminator, Mopar splash guards.
2006 Jeep Grand Cherokee Laredo, Inferno Red, 4.7L V8
RIP 11/2/14 - 2011 Challenger R/T Classic GWE 6-speed