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.
Values are mean±SD. *p<0.05 indicates a significant difference between summer and winter. Summer, July 2012 (temperature, 25.8±1.7℃; relative humidity, 78.9±5.5%); Winter, January 2013 (temperature, –3.6±4.9℃; humidity, 69.7±11.6%).
