Every Texas region shares one system — the same maps, the same live radar, the same climate record. The Valley is the warmest corner of the continental United States and the one most exposed to the Gulf. Hurricanes come ashore here off water that stays bath-warm into November, the rain that does fall arrives in tropical dumps rather than fronts, and the rare hard freeze — 1983, 1989, 2021 — is the event that rewrites the citrus map.