"The Valley is under a freeze warning from 11 p.m. Thursday until 9 a.m. Friday.

Temperatures Thursday night could be in the mid 30s to mid 40s, according to the National Weather Service. Friday's high temperatures will reach 65 to 70, well below normal.

Plants sensitive to cold temperatures may be harmed Thursday night if left unprotected.

Friday night's temperatures will also be in the mid 30s to mid 40s.

Saturday is expected to be clear with a high temperature near 74. Weather conditions all weekend are expected to be cool and breezy."

From MSNBC

http://www.msnbc.msn.com/id/40136910/ns/local_news-phoenix_az/