I put some cherry shrimp in my small patio pond last summer, as a small experiment.
Today I went to clear some algae from the pond and clean out the fountain pump, and found a cherry in the pond! Yes, in January! The temps here have been getting down to the mid-30s Farenheit this last week, and when I tested the pond water temp, it was around 50F (it was a cheap aquarium thermometer, not sure if it was accurate). Anyway, I just thought I would share
It's not all that surprising if one considers that these are actually not tropical shrimp. The range of the various Neocaridina denticulata subspecies includes areas of asia that receive snow in the winter and are much colder year-round than southern california.
I guess it's just surprising that something so colorful is not tropical.
One of my tank is situated in nontempered room. In winter watter temperatures falls to 44°F and Cherry don't seems to have a problem
As I heared Bees can take about 50°F, but I didn't try.
That's just way too cold for me. 
