Not sure I agree with this wording in the frost advisory from LOT. I think a decent number of spots could drop below 32 degrees, barring too much lingering cloud cover.
...FROST ADVISORY REMAINS IN EFFECT FROM 1 AM CDT /2 AM EDT/ TO 8 AM
CDT /9 AM EDT/ SATURDAY...
* WHAT...Temperatures as low as 32 degrees Fahrenheit will result in
frost formation.
* WHERE...Portions of east central, north central, and northeast
Illinois and northwest Indiana.
* WHEN...From 1 AM CDT /2 AM EDT/ to 8 AM CDT /9 AM EDT/ Saturday.
* IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive
outdoor plants may be killed if left uncovered.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Take steps now to protect tender plants from the cold.
&&
$$
Yack