I have never really seen this clearly explained anywhere, simply that in spring you use 1:1, and in winter you use 2:1 or more dense. Why? Why not just always use winter or spring ratios? Logically I guess that it has something to do with putting less water/humidity in the hive in the winter, and more water for cooling in the spring. But even then it seems like you could settle on a good all around ratio that works in all seasons.
Can someone explain the logic or the science behind this?