After a record-setting warm day in west-central Illinois, forecasters say much of the region now is under a freeze warning.

The high temperature Thursday in Jacksonville hit 91.8 degrees at 3:55 p.m. It marked the first time the temperature was higher than 90 degrees in March since about 1907.

The average high temperature for this time of year is 56 degrees.

But a reminder of the fickle nature of Illinois seasons returned Friday. Daytime temperatures dropped to the low 40s, and overnight lows in the mid-20s prompted the National Weather Service to issue a freeze warning for much of west-central Illinois.

The warning from 1 to 9 a.m. Saturday includes Brown, Greene, Pike and Scott counties.

Frost and freeze conditions could kill crops and other sensitive vegetation, according to the weather service, and people should take precautions to protect tender plants.

More-seasonal temperatures will nudge their way back into the region starting later Saturday, which is forecast to be sunny with a high in the mid-50s. Temperatures will climb to the low 70s on Sunday and into the low 80s on Monday, according to the National Weather Service.