Appears BNA will end up with an average mean temperature of 50+ this December. The only other years that has happened is 1889 (56.4), 1931 (50.2), 1956 (50.2), and 2015 (53.1) *** averaged 49.6 in Dec 1984, just before the hammer dropped in Jan '85.
1889-90 & 1931-32, January & February continued the exceptionally warm, with very cold air in early March. 2015-16 was followed by a major January snowstorm in much of middle TN, with winter cutting off just after Valentine's Day. We are currently sitting at 50.7 through the 22nd; with the remainder of the month's expected very warm conditions, wondering if it could bump it up to 2015 for 2nd warmest ever.