I reported on my experience last May:
"I used this stove over the last couple of days on a snow camping trip.
The good news is that the stove worked OK. It was a little slow, but that was because the wood twigs were a bit damp, and because there was a serious wind blowing. That, in fact, was the problem. I had four ordinary butane lighters, and I could barely get a flame out of any one for more than a nanosecond. The wind was the problem. Finally, after 30 minutes of trying this, I used matches and a ball of toilet paper. Then I threw on some firestarter sticks. Then I threw on the twigs.
Now I have a fresh black coating on my titanium cook pot, very thick."
So, in my experience, air temperature and conserving heat were not the problems. Wet twigs and wind were the main problems.