After participating in Pete's quiz on cal course temperature compensation, I wondered how well it works in practical application.
So this morning I went out in the cold on my street to measure a 100m section of my calibration course. I have measured this 100m section many times, a couple of them when the temperature was close to 68 degrees, so I know it is pretty accurate.
It was about 39 degrees when I did the taping, one length of my 100m tape. There was bright sunshine, but it was low in the sky and the course is partly shaded, so I think that had little effect.
My measurement was 100.025m. Applying the temperature compensation gives 100.006m.
I plan to repeat this measurement later this year when it is 80-90 degrees.