Alright... we've established that you're either lazy or busy doing something more important... but what could be more important than this?

Here's the skinny:

The Saints have played only 4 games outdoors this year... @Jets, NE, Chicago and TB.

In those, the Saints kicked off 23 times and there were 10 returns by the opponents, leaving 13 touchbacks for Hartley. I extracted the data by looking at the box scores for each of those 4 games.

Subtracting those from the totals you cited (42/64), that leaves Hartley's INDOORS touchback % at 78%... and not too surprising, a touchback % of only 56.5% outdoors.

Wind and temperature do matter.