Eveything has a high and low temp that will impact quality and create chemical breakdown. This applies to anything really. Think of it like you would perscription drugs, heat, cold, oxygen, light and water can impact potency and each element can cause a chemical change of the drug (the impact of each element depends on composition of the drug). The same applies to detailing products. The products are made of various chemical compounds, each being susceptible to varying degrees of damage from environmental factors. The upside is most are stable and only really vulnerable to extremes in high or low temps when kept in the original containers.
Generally speaking it is advised to keep them in a cool, dry, well ventilated area. M105 for example is aluminium oxide, paraffin oil (a petroleum distillate), solvent naphtha (patrollium based solvent) and glycrol. Something like this is fairly stable under normal conditions as even stuff like solvent naphtha don't boil until 212 F but that don't mean chemical changes don't happen before that.
Your best bet is to take some temp mesurements of where you want to store the product, if they go above recommended usage temps don't put them there.
