Why did I see a climate skip today on a fixed days schedule?

I was surprised to see one of my fixed schedules skipped this morning. At the time the schedule was set to enable climate skip (I have since turned this off). The zones are set up for a custom emitter called drip with precip of 1.6 in/hour. This zone has approximately 1200 emitters operating at 1 gph and runs for 4 hours on a moderate slope in full sun. Weather has been and is predicted to stay dry and sunny.

What would trigger a climate skip under these conditions?

Today at 12:10 AM
Based on weather and soil conditions, the next scheduled watering time for Every Tue, Thu, Sat at 1:00 am will be skipped.