The clearest statewide peak usually shows up in July to August. The biggest statewide split is between the East and the North. Fresno is one of the strongest higher-WBGT examples in the state, while San Francisco is a useful contrast. A statewide average will miss how different one region or city can feel from another.
California is one of the clearest examples of why WBGT is not the same thing everywhere within one state. The most persistent side tends to be the East, while the North is the clearest lower-WBGT contrast. That contrast comes through especially well when you compare places like Fresno and San Francisco.
For outdoor planning in California, location matters as much as season. A state page is useful for orientation, but city pages are the better next step when places as different as Fresno and San Francisco can sit on opposite ends of the state's WBGT pattern.
Klimo WBGT provides real-time Wet Bulb Globe Temperature monitoring to help athletes, workers and outdoor enthusiasts protect themselves from heat-related illness.
Wet Bulb Globe Temperature (WBGT) is a measure of heat stress that accounts for temperature, humidity, wind speed and sun angle. Rather than relying on the air temperature or the heat index, WBGT captures how the human body actually experiences heat, making it the gold standard for outdoor activity safety decisions.