Satsumas are pretty tough, but new growth is a lot more sensitive to cold temps than the older hardened off leaves.
The weather station sensor is saying it got down to 28.4 degrees in front of the garage. It was 31.8 degrees at that sensor when I went to bed at 4:30 am. The other sensors on the front porch of the house are saying it got down to 33.3 degrees. Still only 51 degrees outside now, and they are calling for a low of 37 degrees (yet are calling for scattered frost) overnight tonight. I thought temps had to get down to at least 32 degrees before frost would form?
Hopefully the fruit trees pulled through OK. Might not know for sure for several days, though.