Fig. 1.
The monthly average number of times that temperature exceeded 10 °C (A) or declined below 0 °C (B) compared between the periods 1950–1959 and 2007–2016. Vertical bars indicate the s.e.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.