Dick Lovett wrote in
ups.com:

Webb and Meaden, both from TORRO, provided UK extreme temperatures for
an article in the September 2000 edition of Weather.
However, although maxima were given for each day of the year, daily
minima were restricted to Oct to May inclusive, with the months of
June through to Sept
each divided into thirds, and the lowest given for these 10 or 11 day
blocks.
snip

Do you know why the more precise figures were not given? It seems odd,
especially since - as you mention - the *maxima* are indeed given for every
day.

--
Bewdley, Worcs. ~90m asl.