How Cold?

So just how cold was it in Oakland last night?

• Cold enough for a freeze warning
  

  A FREEZE WARNING MEANS SUB-FREEZING TEMPERATURES ARE IMMINENT OR
  HIGHLY LIKELY. THESE CONDITIONS WILL KILL CROPS AND OTHER
  SENSITIVE VEGETATION.

• What about the ice? They didn't mention the ice, which I found half an inch thick on the fountain outside my window this morning. What happened to global warming?