PHOENIX -- Arizona's most populous county is expected to shiver through its coldest nighttime temperatures in years.
The National Weather Service says temperatures are expected to get into the low 30s throughout Maricopa County this weekend and possibly reach the low 20s in some areas.
A countywide freeze warning has been issued for Saturday through Tuesday.
Authorities are telling county residents to keep their pets inside during the night and cover any sensitive plants or outdoor plumbing.
Daytime temperatures from Saturday to Monday around the Phoenix metropolitan area are expected to be between 47 and 49 degrees, which is below normal for this time of year.