A very crisp and cold morning here in Tucson metro area. Low at the house dropped down to 18 F, making this coldest morning of the Fall/Winter so far.
The two graphics here are from MesoWest (Univ. of Utah) and show the 24-hour minimum at a variety of stations spread across southeast Arizona. The NWS had issued a hard freeze warning for the metro area (they define "hard freeze" as being a couple of hours at or below 28 F), and the two plots show that this warning certainly verified. Here at our cold location along the Rillito wash (within the City limits on the north side) we have had morning lows of 28 F, or colder, on 14 mornings this Fall/Winter. The graphic below shows the very cold temperatures recorded this morning over in the San Pedro basin, where temperatures in the teens were common. The very coldest low came in at 6 F - Russ Scott verified the reading at this station of 11 F earlier this Fall, so this is probably also realistic for that particular location east of Tombstone. So, basically a bitingly cold morning here in the desert!
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