Sometimes
when I camp I place a small thermometer outside the tent. I was camping this past weekend in tall, thin
trees on a ridge at 2,500 feet. When I
turned in for the night it was raining and somewhat windy. I placed a thermometer
on the ground outside the tent but under the rainfly. Around 9:45 PM It read 48 degrees Fahrenheit.
The
rain moved out, the sky cleared, the breeze died down, and the temperature
dropped overnight. After waking up near 5:30 AM I unzipped the tent’s door,
reached out, and brought in the thermometer.
I read 38 degrees Fahrenheit. As I was reading the thermometer the mercury
started rising until it topped out at 45 degrees. I repeated the procedure a few minutes later
with the same result, a difference of seven degrees between in the tent and
outside the tent.
I
was using my new sleeping system, solo, in an eight year old Kelty Quartz, a 2
person, four season tent, on top of a footprint, rainfly securely staked down, with
all the doors and vents closed but no other heat source other than body. I speculate that if another person had been in
the tent with me that the temperature difference might have been greater. I also speculate that if I had been using my Sierra
Designs Ultra Flash 2 person, lightweight, three season tent, which has netting
all around it with no way to close it off that there would not have been as
much, if any, temperature difference
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