Outdoor temp here was 12 deg F last PM, while in my unheated room under the front porch where almost all my fig plants are stored was 35, and in my unheated garage it was 34 (just one tree therethat was too big for me to carry down the stairs).
Not gonna be that cold again for a while, have my small electric heater set to use when it does.
edit: I got one of those remote digital thermometers that Dennis recently posted about, works very well!