covered with frost; "a frosty glass"; "hedgerows were rimed and stiff with frost"-Wm.Faulkner; rimed, rimy
pleasantly cold and invigorating; "crisp clear nights and frosty mornings"; "a nipping wind"; "a nippy fall day"; "snappy weather"; (`parky' is a British term); crisp, nipping, nippy, snappy, parky