For the 12th time this meteorological summer (since June 1), daytime highs failed to reach 70 degrees Wednesday. Only one other year in the past half century has hosted so many sub-70-degree days up to this point in a summer season -- 1969, when 14 such days occurred. Wednesday's paltry 65-degree high at O'Hare International Airport (an early-May-level temperature and a reading 18 degrees below normal) was also the city's coolest July 8 high in 118 years -- since a 61-degree high on the date in 1891.