Cold Frame vs. Outside Temperature

An interesting look at the temperature variance in the cold frame.

[captionpix imgsrc=”” captiontext=”Graph of the temperature difference between the cold frame and outdoor air temperatures. Click on image to see full size.”]


Recently we added an Acu-Rite personal weather station at Clean Slate Farm to so we could monitor the weather via a weather app for Apple iOS devices and our computers. It’s provided some interesting information for us such as wind speed, temperature, humidity, and rainfall. It’s also just a lot of fun to geek out for a change. You can access the weather by looking in the side-bar to the right. If you click on the “KNYTULLY5” link you will be taken to Weather Underground and can see the history of the station. Kind of a fun thing to do.

The weather station is hooked to the internet via an internet bridge, which allows us to post the data to Weather Underground. The internet bridge also allows us to add two more sensors to our private link on the web. To monitor temperature in the cold frame and barn we added two more sensors. The graph you see is the temperature difference between the cold frame and outdoor temps over an eight hour period from midnight 7 February to about 8:00am.

Clearly you can see the temp in the cold frame is 6 to 10 degrees warmer than the outside air. What’s great about the frame though, is the plants do not get frosted over as we discovered last year in the test frame.

Because we didn’t get the cold frame built in time to plant (the lexan covers came late) it is waiting to serve duty as our hardening off box for the seedlings we will be starting this weekend.

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