It seems that Accomack co., VA Beach, and Bedford co, had only one day with temperature below 15F, indicating that in these regions, the risk of PD outbreak is high.
Unfortunately, the mesonet stations are scattered around the states and you may not find the one nearby your place. If you click on the link (a banner) to the weather underground on the right-hand side of this page, type in your zip code, click "view" under "History and Almanac" section, and then click on monthly view, then you can find daily minimum temperatures of the weather station nearby your location in a calender format.
Once your vines are infected with PD, the phytoplasma called Xylella fastidiosa (a bacteria-like pathogen of PD) will spread systemically in the infected vine. X. fastidiosa is known to be vectored by several species of sharpshooters, including glassy-winged sharpshooters (Homalodisca coagulata); however, since these insects can fly and migrate, the insect control may not be the best option to prevent the spread of PD. Thus, the only the practical remedy at this point is the removal of the infected vines in order to reduce the risk of secondary spread.
If you want to learn more about PD, vectors, and the risk assessment, please visit Doug's page at http://www.virginiafruit.ento.vt.edu/PDWinterRisk.html and http://www.virginiafruit.ento.vt.edu/PDsharpshooters.html