I've applied warm water on cold (5-7⁰C minimum temp) days to my more tropical palms so I obviously haven't seen a clear result.

These are my "Final" and more accurate temperatures for these days with this incoming cold front. Could applying warm water during the night to my palms help them in any way?

Warm water will dissipate any "heat" rather quickly. 

 Las temperaturas del martes, miércoles, jueves y viernes parecen muy similares a las mías aquí en la isla de Vancouver.

What palm species are you concerned with during those temperatures?

43 minutes ago, Las Palmas Norte said:

Warm water will dissipate any "heat" rather quickly. 

 Las temperaturas del martes, miércoles, jueves y viernes parecen muy similares a las mías aquí en la isla de Vancouver.

What palm species are you concerned with during those temperatures?

Cocos nucifera, Attalea butyracea and Thrinax radiata

4 hours ago, idontknowhatnametuse said:

Could applying warm water during the night to my palms help them in any way?

If you're using warm water to irrigate, not much help.  What would be helpful for young palms would be to fill up bottles of warm water and surround the palm with them.  I've seen posts here with using "wall of water" as winter protection.

https://www.starkbros.com/products/tools-and-supplies/tools-and-equipment/wall-of-water-plant-protectors

 

10 minutes ago, Fusca said:

If you're using warm water to irrigate, not much help.  What would be helpful for young palms would be to fill up bottles of warm water and surround the palm with them.  I've seen posts here with using "wall of water" as winter protection.

https://www.starkbros.com/products/tools-and-supplies/tools-and-equipment/wall-of-water-plant-protectors

 

Thanks

My neighbor has a staghorn fern, 80+ years old, in a live oak outside. We experience temps in the low 20’s occasionally.  He places a large barrel of water under it and covers with a thick blanket. This has worked for many years since he brought it up north from Ft. Lauderdale. Hope it helps!!