I wear only one coat.

December 2

Nov. 30, Dec. 1 and 2 were remarkably warm and springlike days, — a moist warmth. 

The crowing of cocks and other sounds remind you of spring, such is the state of the air. 

I wear only one coat.

H. D. Thoreau, Journal, December 2, 1859

Remarkably warm and springlike days.  See December 1, 1852 (“The year looks back toward summer, and a summer smile is reflected in her face”)

Sounds remind you of spring, such is the state of the air. See December 2, 1852 ("The distant sounds of cars, cocks, hounds, etc.. . . remind me of spring. There is a certain resonance and elasticity in the air that makes the least sound melodious as in spring.")

I wear only one coat. See November 28, 1850 ("Within a day or two the walker finds gloves to be comfortable, and begins to think of an outside coat and of boots"); December 3, 1858 (" I walk with unbuttoned coat, taking in the influences of the hour."); December 6, 1859 ("That is an era, when, in the beginning of the winter, you change from the shoes of summer to the boots of winter.");  December 11, 1853 ("Almost a complete Indian-summer day, clear and warm. I am without greatcoat.");  March 31, 1855 (" I am uncomfortably warm, gradually unbutton both my coats, and wish that I had left the outside one at home.")  See also A Book of the Seasons,  by Henry Thoreau, Signs of the Spring; My Greatcoat on my Arm