Juwel 1000 Cold Frame: Temperature Testing Research Part 2

After looking at the previous results (see part 1) of my temperature experiment with my Juwel 1000 I decided to add a row of bottles of water around the perimeter of the inside of the cold frame to see what effect that would have.

Click to enlarge

Here are the statistics from the data for the graph above.
Maximum temperatures: 85.1F (inside), 63.5F (outside), and 23.4F (difference)
Minimum temperatures: 37.4F (inside), 27.5F( outside), and 3.6F (difference)

Conclusion:
The thermal capacity of the water bottles was enough to keep the temperature inside of the cold frame above freezing when the weather is clear during the day and the temperature drops below freezing at night.