The 30-year average temperature, known as the meteorological normal, is rising in most locations in the U.S.
The number of days with heavy precipitation is increasing in most locations in the U.S.
Climate change is affecting the frost-free season in these cities, which also affects the allergy season.
Groundhog shadow or not, spring has been trending earlier in the U.S.
2017 was globally the third-warmest year on record. See the rest of the top 10 here.
2017 was the third-warmest year on record in the U.S.
As the world warms, snow cover in North America is on the decline.
Daily record highs are dramatically outpacing daily record lows in the U.S. in the last 20 years.