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Just saw that scripting is not yet reactivated.

Here are the new values I measured today.
I wrote down the raw value before and after taking the image:

time    raw-before  raw-after  temp C
19:02   151        151   26
19:04   152         152   30
19:05   156        156   33
19:06   156        159   36
19:08   159        159   38
19:09   164        164   39
19:11   166        166   41
19:12   166        166   42
19:13   171        171   42
19:16   175        175   45
19:16   175        175   45
19:18   175        175   46
19:19   177        177   47
19:20   177        177   47
19:22   176        176   48
19:23   181        181   48
19:25   181        181   49
19:30   183        183   50
19:32   183        183   51

- Klaus

[EOS 6D, using raw-after as RAW]

The best, simple fitted curve has a cubic function;
temp_C = -4152 + (72,2 * RAW ) - (0,4193 * RAW²) + (0,000815 * RAW³)
That one had R-Sq(adj) 97,7%

The best linear function:
temp_C = -69,12 + (0,6558*RAW)
R-Sq(adj) 95,3%

The quadratic function:
temp_C = -351,9 + (4,045 * RAW) - (0,01011 RAW²)
has an R-Sq(adj) of 96,8%

Omitting the raw-after of 26 Celsius, the linear function seems ok.
One would need more data points in the lower and upper temp segments to be sure, though.
With more points, a better fit... a simpler equation?

/Oscar