It was 79 in the house last night and I turned my air conditioner on, I live in central Illinois and this is the earliest in my memory that we've turned it on.
Our Forsythia bushes are already in bloom, another "earliest ever" for here.
I briefly considered starting my garden but thought better of it, it could still snow in April.
I set out my garden on May first one year, went on two week vacation and came back to a dead garden. We had gotten a hard frost on May 10th.
The cool-weather crops can be planted early here, without too much concern, provided they’re on higher ground (frost settles low); and fast-growers such as sweet corn are often tall enugh there’s no worries. Radishes are a 30-day crop anyway (and how many radishes does one need?), and the various cole crops are quite hardy.
You can start peas, lettuce, onions, and spinach, and any other cold weather crop. Most of them can take a freeze.
I got those in already, last week, here in CNY, (Central NY).