CHICAGO (CBS) — This Cubs Opening Day won’t be setting any records for cold, but it will require a jacket – and your plants will require protection overnight as a freeze threatens the area.

CBS 2 Meteorologist Megan Glaros said 47 degrees had been the anticipated temperature when Bill Murray threw out the first pitch at Wrigley Field at 1:20 p.m.

As the day goes on, most areas will see the low 50s, but temperatures may not make it past the upper 40s along the lakefront, where a cooler breeze is blowing n. The average for this time of year is in the mid-50s at least.

The official forecast high is 51 degrees.

Overnight, a freeze watch is in effect for the entire Chicago area, and a freeze warning is in effect in LaPorte County, Ind., and parts of Indiana farther east. The overnight low is 33, and everyone is advised to protect their outdoor plants as best they can.

The trees in flowers are about six weeks ahead of their typical cycle, and if they have already bloomed, they may not make it through the night from Thursday into Friday.

The high for Friday is 54, Saturday 63, and Easter Sunday 66.