Gutshot, I never thought about weather affect the ask solution. I could see where it might cause the pores to tighten. Maybe that why it took longer to looses the hair than I had read, cause I usually do most of fletching in the winter months.
Now, the egg tanning solution is mighty touchy in the heat of the summer. I did my first batch in July and had it in the carport in a pickle bucket. I stirred it right on schedule. I immediately started the second batch even though I was going camping in NC. I put the lid on the pickle bucket to transport it to campground. I didn't stir on the trip down, then forgot about most of the next day. It was "working" in that closed bucket. It smelled terrible when I opened the bucket. haha. I washed the hides out and brought them home. I re-stretched and dried them, but never finished the process. Those are the ones that need to be done over to finish the process. haha