Temperatures in the United States last year set more all-time heat and cold records than any other year since 1994, according to a New York Times analysis of Global Historical Climatology Network data.
Heat waves made up most of these records. All-time heat records were set last year at 8.3 percent of all weather stations across the nation, more than in any year since at least 1948, when weather observations were first digitally recorded by the U.S. government.
The world has been warming by almost two-tenths of a degree per decade. Extreme-temperature events can often demonstrate the most visible effects of climate change.