some crazy little microclimates around here under certain conditions.
I found a PWS a little over a mile away near the intersection of River Rd and Willard Ave in Friendship/Bethesda where the low was 8F colder last night (22F vs 14F), and currently it's 19F there while 25F here. I would guess that part of it is proximity to the Wisconsin Ave corridor plus the fact that we are near the top of the "ridge" coming up from the Potomac River valley while locations further down River Rd slope downwards towards the river. We generally have at least a light wind almost always, plus we don't radiate well to begin with.
We are even several degrees warmer at night on some nights than PWS that are 5 or 6 blocks away (and about 100 feet lower in elevation).