Beautiful clear skies early this morning, as per south view from Kitt Peak. Add in PW values of around 5 to 7 mm and conditions were right for strong radiational cooling during the night.
Morning lows for our part of Arizona shown above and below for our part of Arizona. Many lows around 40 F or so but quite a few sites came in at freezing or colder. Low here at house was 32 F.
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