"Heat kills more people in the U.S. than any other weather-related phenomena."

Seems reasonable.

Bard prompt "Which kills more people annually, cold or heat?" Bard response: "According to a 2017 study by the Lancet, 4.6 million people die each year from cold exposure, while 0.5 million people die each year from heat exposure. This means that for every death linked to heat, nine are tied to cold."

Also seems reasonable.