June is half over, and although this is about as pleasant a day as one could expect on the threshold of summer, this has been a remarkably toasty period in Philadelphia.

Assuming that today's forecast stays on track, the official average temperature at Philadelphia International Airport for the first half of the month will come at just about 76 degrees.

That would place it No. 5 on the all-time list, within a sweat bead of 1973, in fourth place at 76.1.

The all-time warmest was 1925 -- 79.9 -- when June began with a blistering heat wave. In the first week, the temperature hit 100 twice and 98 three times.

The warmth of June 2010 is peculiar in at least a couple of aspects. For one, it has been amazingly benign. The temperature never got above 93 during a mild five-day heat wave, and no heat-related fatalities were reported in Philadelphia.

No significant heat is on the horizon for the next several days. It will warm up at the end of the week, but right now it appears that the heat indices will be on the mild side.