bluebird day
n.— «It was warm and sunny, what duck hunters refer to as a bluebird day; great for lounging and talking about ducks but not the preferred nasty weather that gets the birds flying.» —“Waterfowler’s rig is rooted in Vineyard’s past” by Nelson Sigelman Martha’s Vineyard Times (Vineyard Haven, Massachusetts) Dec. 24, 2008. (source: Double-Tongued Dictionary)
Further reading
After our conversation about the expression dingle day, a term used by workers at a research station in Antarctica to denote bright, sunny weather, a listener offers a possible explanation for this term. It may derive from the idea of the skies...
There are lots of creative names for the @, also known in English as the at-sign. In Denmark and Sweden, it’s sometimes called the snabel-a, or “elephant trunk.” In Italian, it’s a chiocciola, or “snail. In Greek...