The Colorado River corridor, gets wind and for a couple of weeks in Jan it can get cold (I've been snowbirding in the area 18 years) four or five days with frost is not unusual, although local tv will try and tell you a different story.
Yuma gets more wind, areas at higher altitude get colder.
I can't think of any where close to the river, or in the area, that is consistently warmer/calmer.
If warmer is a must, back up your arrival time a couple of weeks and stay into March.