1978 was also similar slightly cooler at overall 14.4c don't remember how wet it was though.
interestingly the period 1902-1922 had 7 summers that sit in the top 30 coldest summers in the records obviously 1913 doesn't make it
Addicks Fan 1981 1993 sits at 112 coldest..in my lifetime the top 3 coldest summers are 1972 (too young to remember) at 23 on the list and 1977 at 38 and 1978 at 41.