Following up on what Aart said, a dark color will heat things up. In winter I use black rubber bowls set in the sun for water. If the sun is shining water stays thawed even in the mid teens Fahrenheit. In summer I use white bowls in the shade to keep water cooler.
When we got a new roof we went from dark shingles to a light reflective metal. It costs less to keep the house cool in summer, more to heat the house in winter.
Color does matter. If your paint makes it darker it will be warmer. If your paint makes it lighter it will be cooler. Not because paint traps heat on wood but because darker colors absorb heat and light colors reflect it.
When we got a new roof we went from dark shingles to a light reflective metal. It costs less to keep the house cool in summer, more to heat the house in winter.
Color does matter. If your paint makes it darker it will be warmer. If your paint makes it lighter it will be cooler. Not because paint traps heat on wood but because darker colors absorb heat and light colors reflect it.