HIGH STORM RISK  — San Angelo endures some of the harshest heat in West Texas, with a record high of 114 F and a record low of -4 F -- a swing that drives severe expansion-contraction stress on shingles, ridge caps, and sealants. In 2011 alone the city logged 100 days at or above 100 F, accelerating UV degradation and shingle blistering. Average annual snowfall is just 1.3 inches, but the rare ice event can snap brittle shingles already weakened by summer heat. Annual precipitation averages 20.94 inches, delivered in fast-moving thunderstorms that test flashings and valley seals. Hail risk is elevated on Texas's southern plains, requiring regular post-storm inspections.