Yeah the clear still nights are bone chilling here, too.
Mass makes a huge difference to the temperature in my greenhouse. I have lots of mass in the floor but that gives heat in the fall and winter, by spring it's well, stone cold. The real difference in spring and on a day-night cycle is above ground mass. I use buckets and other water containers, but what really makes a big difference is the soil in the containers. I can really notice the difference this year because there's none of that mass left, everything's been emptied out. It was noticeable in the fall as soon as I cycled the soil outside.
One thing about mass, the size of the item dictates how long is the cycle to acquire and then release heat. Smaller masses are great for the short cycle, larger masses for longer term cycles.
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