Today's outdoor temperature at 12 p.m. : 6 degrees Celsius/42.8 degrees Fahrenheit
Today's temperature inside the new cold frames: 19 degrees Celsius/66.2 degrees Fahrenheit
Bring on the four-season growing! Now if I could only get my compost pile to thaw out...
Ed. update: As of 9:30 p.m., the outside temperature has dropped to minus 2 degrees Celsius, but it's only 1 degree in the cold frames -- a three degree difference, versus today's 13 degree differential. So once the sun sets, it looks like the frames are losing heat like a sieve. Tomorrow I'll try snugging some straw bales around each frame for some external insulation. Stay tuned!