When the going gets cold, go lobster.
I loathe the trainer. Not even sipping on a cold brew during an indoor spin could make me enjoy the experience of pedaling on that stupid fluid roller.
So out into the cold Utah I went to spin on some real roads, snow be damned. I searched and purchased several gloves before wiser minds steered me towards the lobster style for the coldest of riding days. This is clearly the way to go for winter riding; leaving fingers to fend for themselves in standard gloves simply does not do the trick.
With these babies, I could easily tackle temps in the 20s. Low teens probably merit the use of an additional liner to keep those digits toasty, but still doable. The lobster style does take some getting used to when operating your brakes/shifters, however the benefits of warmth will make this an easy adjustment for you. Highly recommended.