Temperatures were on the rise in Nevada in 2007.
National Weather Service officials recorded the hottest year on record for Las Vegas.
The final average temperature of 71.1 degrees shattered the 70.1 degree record set in 2003 and matched in 2005.
Reno also saw an unusually warm year.
Reno weather service meteorologist Alex Hoon said the 2003 record for hottest average temperature wasn't broken, but 2007 would place either second or third behind it.
Hoon says Reno did break its record for the warmest August in history.
Officials at the weather service attributed the unusually warm weather of the past year to the "heat-island" effect, where buildings and streets trap heat during the day and don't cool down at night.