For 20 degrees F. what David said
“If I can be careful to keep them moderately dry, I use fleece liner gloves.” I have 20 year old pair of LLBean stretchy liner gloves that are about the thickness of Polartec 100.
For cooking I often use fingerless rag wool gloves.
When it gets cold, I use the Polartec liners inside a BPL waterproof breathable mitten. I also sometimes bring possumwool gloves to use inside the BPL mitten. But when the possumwool gloves get wet, they are slippery.
Although this topic has been debated here, I find if a glove is not too wet, I can dry it out by placing it in the inner pocket of my synthetic puffy, and sometimes will bring it inside my sleeping bag at night. This technique can work for a one or two night trip but is not recommended for longer trips because I think it risks contributing to the moisture buildup inside my bag.