I've read a lot about wet vs dry chain lube and there doesn't seem a definitive answer on whether to use wet or dry chain lube in the winter. Some forums are full of people saying they only use dry lube because it doesn't wash off as easy, then other forums are full of people saying the opposite, for the opposite reason!
What type of chain lube is best for winter riding (water, gritted roads etc)
Personally I would go with the finish line wet as opposed to the dry.
Typically I use the dry if I want something that will keep my chain looking clean as well as lubricated. From personal experience I have found that I need to reapply the dry lube more often.
I will use a wet lube, sparingly mind you, for the nastier conditions.
Having wasted your time with that I would say that storage temperature/location, how you clean the chain (method, frequency and intensity) and how you apply the lube (gobs vs. sparingly on each link) is more important than the type of lube.
My experience has been that the Wet / Dry naming of the product is a hint as to what conditions the product is designed for.
Wet lube is typically more like motor or sewing machine oil, and is designed to coat the chain and protect it in wet conditions.
Dry lube is usually a teflon lube in an evaporating or wax base, so the teflon particles stay in the links without a lot of wet "gunk" left on the chain to pick up sand, dust, grime, etc.
I use a product called 'Purple Extreme', originally developed for offshore oil rig components. I guess it is 'dry', because it dries on the chain (although you can use it immediately, they recommend letting it dry on first).
I've never had much luck with dry lube. It has very low viscosity and feels like it washes off easily. I use Finish Line Wet lube all year round. It's cheap, widely available and clean when applied carefully. I apply by taking the chain off the bike, cleaning it and dropping a couple of drops on each link, allowing it to soak in and then wiping off the excess. Sounds fiddly but it doesn't take long and you get lube where you need it (inside the links) and not where you don't (everywhere else).
I'm a big fan of Pro Gold. Year round, all weather. http://www.progoldmfr.com/products2/ProLink_Chain_Lube.htm
Apparently the Pro Gold company got their start making lubricants for mining equipment. So think lubricating metal in adverse conditions. Anyway, the downside to their bike chain lube is that it can be hard to locate locally. It's available online though.
I just recently mixed Finish Line Dry with 0.5 micron hexagonal boron nitride powder, a.k.a. white graphite. Night and day! And the HBN seems to add a lot more staying power.
