I saw the temps you were getting in the green house. Don't know if you know but different plants prefer widely different temps to germinate. Celery likes it cool, 55-65F. Pumpkins and squashes between 75 - 85F. If you get outside the preferred perimeters, germination drops fast, on either end.
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I have to get thermometers set at the various heights so I can see the gradient from top hottest to coolest bottom in the greenhouse. Right now I have the thermometer hanging at mid level. I have my celery outside but the emitters are off center with the holes so they weren't getting good water to the seeds when I had them planted when temps were prime.