2. (vulgar).Stifling and damp: of the weather. Also MUGGINESS.
1865. G. F. BERKELEY, My Life and Recollections, ii. 120. I shall never forget a still hot day, or what would vulgarly be called a MUGGY, hazy day, in June, at the fullest time in the Park.
1871. London Figaro, 27 Jan. Here a north-east aspect means exposure to the keenest winds that blow, to the sharpest frosts that occur, to the most damp and dismal atmosphere whenever the weather happens to be MUGGY in winter.
1873. BROUGHTON, Nancy, ch. xliv. Nice and fresh! Much better than one of those MUGGY days, when you can hardly breathe!
1883. G. A. S[ALA], in Illustrated London News, 30 June p. 647, col. 1. A temperature varying between raw chilliness one day and oppressive MUGGINESS the next.