Some bad weather you've been having. We have the same temperatures at the moment, but there's certain lack of snow in my region.
Lucky me. It's cool and I went outside in just a T-shirt. It started being chilly only after being 45 minutes among my Ensenia foetida. Literally.
Beware, when the snow melts down and the water is absorbed by the soil and frosts come again, palms might come through a shock and that could be the last hit for them.
What were the min. temps at your place in last... say 2 months? How did Jubaeas take it? I guess no protection was used on those high specimens, right?