Yes, that's a sprinkler on in the Conifer Garden north of the Visitor Center. Our snow drought has meant a real drought now as rainfall has just been spits and drizzles too. 6 days in January 2012 have had a temperature above 60F!
So yes, it's time to water any new plantings or evergreens whose soil around them feels dry to the touch. It's also time to prune fruit trees for a bumper crop next year. Most of all this mild winter weather offers no excuse to experience the beauty of the winter landscape from evergreens to sky!