Here they come! Those four little words that Oklahoma cattle producers despise in the summertime: “high pressure heat dome.” Understanding and avoiding heat stress in cattle can be a valuable management tool for summertime in Oklahoma. Most areas of Oklahoma have 10 or more days each year above 100ºF and 70 or more days with high temperatures above 90ºF. This means that most cow calf operations will be working cattle on days when heat stress to cattle is likely.