Joined: Oct 2012
Posts: 1,260
Likes: 105
From: Twin Cities, Minnesota, USA
Bikes: 2017 Salsa Carbon Mukluk frame built with XT, 2018 Kona Rove NRB build with Sram Apex 1,2008 Salsa El Mariachi, 1986 Centurion Ironman
Chiming in from Minnesota, two or three, depending on the top layer. Sometimes if it's very cold I'll go with a very light AND midweight merino, with a water/windproof shell on top (in my case, Rab Latok Alpine), and then sometimes a light OR midweight merino with a very minimally insulated top layer (I use an REI Revelcloud jacket). I've used this quite successfully down to -23F.
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Don't complain about the weather and cower in fear. It's all good weather. Just different.