The low so far this morning at the SLOweather station was 28 degrees F at 5:43 AM. The lowest temperature I’ve seen so far this morning is 10 degrees F at Santa Margarita Lake.
There was ice on our bird bath this morning.

There were a few birds from our feeder looking for a drink, so I broke a few holes in it. I was expecting just a glaze of ice on it, but it was thicker and stronger than that, a quarter to a half an inch.

Since I’ve been checking the weather, I’ve noticed how much the temperature can vary over a fairly small area. It can change as much as a degree or two per mile over fairly flat land, and several degrees over a small change in elevation.
Just this morning, there is 4 degrees F difference between the main SLOweather station here at home (30) , and another thermometer down in our woods (26), about 350′ away and 100′ lower in elevation.
Because of that, since I’ve been using WxSim to make my own local forecasts, I’ve noticed how difficult it can be to make accurate local temperature forecasts. What is accurate for my location may not be right for the airport, or for downtown.