Good lord.... before the internet and forums, people didn't worry about such things as keeping powder in climate controlled conditions. I've never kept my powder anywhere except in a garage or shop (in Texas) and have
never had problems with it, in over 40 years of reloading.
You fellas do realize that once powder is loaded into a cartridge its subject to the same high temperatures, don't you? Do any of you store your ammunition in climate controlled conditions? Yeah, me neither, and again, no problems. So to
@elktrout just put your powder in a box in the trunk of your car or bed of your pickup and be on your way.
35W