Record High Temperatures

Image Source: Climate Central

There has been a growing imbalance between record daily high temperatures in the contiguous U.S. and record daily lows. 

A study published in 2009 found that rather than a 1-to-1 ratio, as would be expected if the climate were not warming, the ratio has been closer to 2-to-1 in favor of warm temperature records during the past decade (2000-2009). This finding cannot be explained by natural climate variability alone, the study found, and is instead consistent with global warming.