I enjoy the Dictionary app very much. It is my go-to app for when I need to learn something quickly, or to look up a spelling, since I write. I discovered the word halcyon this December, and I find it to be a lovely synonym to calm and peaceful. I would most definitely say that we are having a halcyon winter here in Jacksonville, FL.
“This term meaning “calm” or “peaceful” comes from Greek mythology: As the legend goes, Alcyone, daughter of Aeolus, god of the winds, was turned into a kingfisher with her husband, Ceyx. For 14 days around the winter solstice, she laid her eggs in a nest on seas made calm by her father. The word halcyon is thought to be derived from Alycone, and is often paired with days (halcyon days) to refer to calm winter weather. Halcyon can also refer to a kingfisher, mythical or otherwise.”