What do you guys do? I usually just leave it in tote in my basement and keep it out of direct sunlight and heat

That'll work fine.

Myself - I 'snagged' a lower cabinet when my neighbor was redoing his kitchen (with permission...) and I use that for my line and reels during the off-season. It's in the basement in the 'fishing room'...yes, I have a room down there that's delegated to my tackle and nothing else.

I keep my line in a box, in a closet in the house. Cool and dark.

Anywhere you store things in your house will work fine. Assuming nobody puts their line in the window like a flower pot.

Just took all mine off the hot garage wall and into a shoe box inside the house.  

Learned that extreme cold also ruins mono line.

Left a few spools at my in-laws in Canada, returned the next summer and the line was like wire. Soaked the spools in warm water over night and it was still stiff.

Cool dark place is ideal, under 100 degrees and over freezing.

Tom 

In a drawer in the basement.  Seems to last forever that way.

Mine is in a plastic tote in my shop. All my fishing stuff stay out there.

It might not be the cold as much as the dry in storing line outside the house.  Nylon stiffens when dry, gets more supple when wet/humid.  Snap fit nylon cable fittings in auto plants in MI were often kept in a bucket of water to prevent their getting brittle before installation.   

 

I got lazy and didn't bring my mono into the house last fall and filled a reel recently and it just didn't seem as manageable as I had remembered.  Acted more like FC.

 

Moderate temperature, humid, dark place would be ideal.

2 hours ago, MickD said:

Moderate temperature, humid, dark place would be ideal.

And while you're at it,

you could grow some mushrooms . . . . .

A-Jay