Spring seems a good time for a basic CYM palette (cyan, yellow, magenta) plus a few convenience colors — I chose quinacridone magenta, hansa yellow light, and phthalo blue. Not sure about the other colors.
For summer, I put together a basic “warm and cool” primaries, greens, plus neutrals. I could eliminate one green and the sienna from this set, doubling the mixing pan size.
As mentioned, autumn is my favorite time for lots of earthy granulating color.
And winter? I was thinking of starting it with ultramarine blue and burnt sienna for lots of warm and cool grays, then add just a few colors for accents. Of those shown, I think I might ditch the indigo and sienna. Not sure.
Would I actually stick to a designated palette for each season? Definitely not; I love mixing it up too much! But it’s interesting to think about. What colors do you think of for each season?