This may not come as a surprise to you, but my fruit trees know more about weather forecasting than I do.
Two years ago my peach and nectarine trees bloomed in February, and despite some frosty spring weather, the trees produced a bountiful crop. This year the flower buds have just started to swell, and flowering is probably a month off. Nature knows.
That doesn't mean your trees don't need your help to thrive, and stay alive during times of winter weather.