Martinez Lake, Arizona, has established a new national high-temperature record for March, hitting a scorching 110°F (43°C) on Thursday, March 19, 2026. This unprecedented heat surpasses the previous record of 108°F (42°C) set in South Texas in 1954 and matched in 2020. The record-breaking temperatures are attributed to a persistent heat dome that has settled over the western United States. This phenomenon traps warm air, leading to unusually high temperatures for this time of year, posing potential health risks to residents and visitors alike.