The freezing point of water is indeed 32 degrees F.
Except where it has been supercooled. In laboratory conditions, water has remained in the liquid state while cooled to as low as -28 degrees F. Of course, supercooled water is very unstable. Drop in a seed, and the water will freeze instantly.
(Please note that I am not defending the arguments of the "Religious activists" in the cartoon. These are clearly nonsensical -- a straw man argument at best. I'm just pointing out that science is more complex than this cartoon makes it out to be.)
Or has had solutes added. Freezing point depression.