A few months ago a member here, Randall, who only lives a couple miles from me as the crow flies, had a sudden increase of 12F higher than me, and this was at night as well. I was somewhat stupefied, then noticed he had a brisk east flow of wind, which comes off the Rincon Mts. My wind was dead calm. That caused down sloping winds, which compresses the air, making it much warmer. Happens here quite often. Think Santa Anna winds that Socal gets. Same thing. No idea if that applies here, though.