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TUCSON - Another cool day will lead to freezing temperatures tonight.

Tucson recorded its coolest daytime high since March 20th only topping 59 this afternoon, according to Meteorologist John Patrick. Clear skies, dry air and light winds will all combine for a very chilly night. Freeze and Hard Freeze Warnings are in effect for late tonight and into early tomorrow morning.

The Hard Freeze Warning includes Cochise, Graham, Greenlee and Santa Cruz Counties from 1am to 9am Monday morning. Many sites will see temperatures into the mid 20s by the early morning hours. Make sure to protect your pets, plants and pipes.

A Freeze Warning is in effect for Pima County including the Tucson-metro area from 1am to 9am Monday morning. Many locations around town will hover right around the freezing mark by morning. The average first freeze for Tucson is November 24 so if TIA hits 32 tonight it will be about two weeks early. The earliest first freeze for Tucson was seen in 1899 on October 16.

A warming trend starts tomorrow as an area of high pressure builds into the southwest U.S. There will be about a forty degree diurnal swing as Tucson heats up to about 72 by tomorrow afternoon. Temperatures peak on Thursday with daytime highs right around 80, that's about five degrees above average for this time of year.