In article ,
Nick Gardner writes:
My July mean temperature is currently at 15.4C, the same for June 2007.

Min Max Mean
July 11.4C 19.4C 15.4C
June 11.1C 19.6C 15.4C

I wonder how many times in the past has June ended up being warmer than
July.

In CET terms, the last occasion seems to have been 1970, when the
disparity was quite pronounced (June 16.4, July 15.2). There have been a
few near misses much more recently, though, and no doubt some of those
occasions may have had cooler Julys than Junes at some individual
stations. Of course, the comparison outside the CET area may have been
noticeably different from that within the CET in some years.
--
John Hall

"I am not young enough to know everything."
Oscar Wilde (1854-1900)