Sandy I feel your pain. They say I am a zone 6 and I feel it is more a zone 4 or 5. We have strange heatwaves through the winter as high as 60s and 70s in Jan with as low as -20s for weeks. But when they average out those high with the lows they put us in a higher zone.
Meanwhile back in the garden the plants are dead because they do not know about those darn average temps and died when it was minus 20 waiting for us to get back to the 60s and 70s in a few weeks.