That makes sense, western Queens is very dense and urbanized, and becomes a little less so the futher east you get. Also around LIC you have about 12 miles of land including the most urbanized parts of Brooklyn separating you from the Atlantic, once you get out to GCP, your lined up with Jamaica Bay and now you only have about 6 miles btwn you and the water.
I feel similar about Manhattan, during the day it does feel a little less hot compared to just outside of it, I think its cuz there so much shade from tall bldgs. Just out of there esp Queens and the Bx its still very urbanized but without all the shade, so much more sun reaches the ground to bake you. I do noticed those temps really peak on and near roads like 278/BQE, Bruckner, Deegan, Cross Bronx. That kinda what alot of NYC is like away from the water or in a park.