Take a look at how cold nights have been trending for various cities across the U.S.
Even with the big swings of Halloween weather from year to year, Octobers are warming across the U.S.
All regions of the continental U.S. have seen the frost-free season, defined as the stretch between the last below-32°F reading in the spring and the first in the fall, grow longer.
The probability of a tornado touchdown somewhere in the U.S. jumps to nearly 80 percent in May and nearly 90 percent in June.
The contiguous U.S. has warmed 2.1°F since the first Earth Day in 1970.
While this has been a snowy winter, the past 50 years have shown a trend of less overall spring snow cover in the Northern Hemisphere.
Spring is arriving earlier across the U.S. by an average of three days.
For the first time in 20 years, the U.S. is on track to set more record lows than record highs in 2013.