Sorry to hear about that. Any potted palms should be brought in for a cold wave of that magnitude. You can get away with 29 for a few cold morning hours, but 21.5 is just too cold for potted plants b/c the pot freezes thru.

Looks like our cold air found you this year. Maybe next year it will be us going below normal. 21 is not bad for NYC in Jan but I have to cover my palms.

21*f also here this morning in socal but in the high desert!
hope most stuff survives for you.

I got 27F here at my house. My kentia looks pretty beat up but it should recover pretty soon. My majesty is all wrapped up so it should be just fine under the heavy burlap.

Those are some pretty cold temperatures. Majesty palms seem to do well down to about 26F, even one degree colder than that and they are toast in my experiences without protection. I left mine out through 3 light freezes (down to 30F) and it had no damaged at all.
-Alex

alex how long will it take for the damage to show in the majesty palm? the spear is still snug and the fronds have little discoloration.

As majestys get larger..they get hardier. We skirted freezing..in open areas of town dipped below. Thanks for urban warming the rest stayed at 33f..for about an hour. By 9am it was 40f . Majestys stayed ok.
The thing about them-they are almost deciduous palms..they have a great ability to grow many new fronds over a summer..even a summer where the ave high is just 75-77f.
The Howea is a zone buster for central cali-I hope he soon see's it trunking. Just keep watering!