Best crack a beer. Iāve found those charts fairly accurate, perhaps even a tiny bit optimistic. They are based on 1/2 hr. low temps. Many times the low temps last longer than 1/2 hr. If it really gets down to 25F, any fruitlets formed will be gone.
Weather is terrible here too. We lost a lot of fruit buds from the winter cold, and will loose just about everything if the temps get as low as I see some predictions. Predicted lows to be anywhere from 18F to 21F.