I unattach my depth sounder screen and take it into the house. I also keep my boat in an unheated but attached garage. I leave the rods and reels in my boat stored in an open rod horizontal holder system.

Fishing line, mono, is attacked by sunlight and OZONE GAS. Other chemicals in the air will also attach the fishing line. Acids in the air and rain can also effect the mono lines. But the biggest damages is caused by UV light. UV light will break the bonds of the plastic in the line and deteriorate the fishing lines. Not sure how braided lines are effected by the elements. cotton lines are also effected by the acids in rain. Some rain where I live has a pH of 4.0. That's 1000 times more acidic that pure distilled water which has a pH of 7.0. Acid rain effects everything it touches and slowly oxidizes or reduces things that are exposed to it. It takes time because the acid rain is not very strong even though it's pH is low. But over time it does a lot of damage to things like Plastic webbing in the lawn Chairs for example. I think that anyone who has had one of those folding aluminum chairs with the webbing deteriorated knows what I am talking about. Ozone at the ground level will also eat the plastic webbing up. That's what Ozone does to your fishing line too given enough time and enough Ozone at ground level.

If you protect the reels and lines from the sun and air then they should last longer. I also use a pray on silicon substance that wets the line and take the memory out of the line. This reel magic works great and it also coats the mono and gives it some protection from the sun and air. Sort of like putting on oil when sitting out in the sun to prevent a sunburn.

Hope this helps.

Moisture may hot harm the fishing line but it might be a good idea not to get the inside of your expensive reels too wet. Moisture and especially moisture that's acidic in nature may start some unprotected metal to rust sooner. Most of the reels these days are made from stainless steel hopefully and the chromium helps to protect the metal from rusting. Still it's a good idea to take the reel apart and degrease it once in a while and then add grease and oil back on the reel after it's all dried off and all the sand and grit has been removed. Sand which is silicon dioxide or quartz crystals is hard stuff and it will wear on the metal parts if it's allowed to get in the gears. So by decreasing the reels inner parts with something like Trichloroethylene or Perchlorethylene you can get all the old grease and grit out of the reels grease and make it last longer. If you can't take the time to do this then have someone else do it for you every once in a while. My dad always took the older reels apart and cleaned them each winter. And we always used fresh new line before any major fishing trip. And he sharped up all the hooks on the crank baits using a diamond sharpener.


Regards,

Moose1am