[clearvision]

Yes, that was discussed in earlier threads, which is why I made sure to point out "in this case" because they were only dealing with two numbers, so you get the same result.

[bvw]

And even if they dealt with a bigger series of temparature readings it would still be the same for the intended purposes, as the diurnal temparature variaion is gradual and regular.

[Henrietta]

Okay, gotcha. I missed the earlier thread...