I’m going to go for something random and say “snow”. Where I grew up, we could get quite a lot of snow in the winter, so those months were filled with sledding, snow forts, ice skating, etc. Now I live in an area that tends more toward cold and dry or possibly rainy, but we don’t get a lot of snow. I miss it, but I do have very good childhood memories of it!
Part three will be coming soon! :)