"Steve J" wrote :
On 7 Dec, 19:00, "Philip Eden" wrote with reference to Coventry's
maximum temperature of 16.4C on 22/12/1915:

This one's intriguing (16.4 isn't the equivalent of a whole number
fahrenheit)
but Coventry was appearing in the MWR by this time, and it is given as
56°F. If this is your station, Steve, then the observation has been
quality controlled.

Again, clearly written in the log by hand, it records 61.5F as the
maximum, with 47F as the dry bulb at 0900hr; however, I don't think
our record was in the MWR then, so will go by that as a mis-reading
thanks Philip = however, we also have a 57.5F on the 14th!

Steve, it appears most likely that you have an observer problem
during that era, although if you want to investigate it seriously
you would also have to be aware of possible changes in site/exposure,
screen type, and instrumentation. The first step would be to compare
monthly mean max and min with adjacent stations to identify
systematic differences, see if there are any non-systematic differences,
and then determine whether the differences in extreme max and
extreme min (I say these, because they are available in publications)
are within limits of tolerance. This may, of course, open a whole
can of worms.

Philip