The sound of the snowflakes falling on the dry oak leaves.

December 11. 

At 2 p. m. begins to snow, and snows till night. Still, normal storm, large flakes, warm enough, lodging.

See one sheldrake in Walden. 

As I stand on the railroad at Walden, at R. W. E.'s crossing, the sound of the snowflakes falling on the dry oak leaves (which hold on) is exactly like a rustling produced by a steady but slight breeze. But there is no wind. It is a gentle and uninterrupted susurrus. 

This light snow, which has been falling for an hour, resting on the horizontal spray of the hemlocks, produces the effect of so many crosses, or checker or lattice work.

H. D. Thoreau, Journal, December 11, 1859

Still, normal storm, large flakes, warm enough, lodging. December 14, 1859 ("Snow-storms might be classified. . . .That of the 11th was a still storm, of large flakes falling gently in the quiet air, like so many white feathers descending in different directions when seen against a wood-side, — the regular snow-storm such as is painted. A myriad falling flakes weaving a coarse garment by which the eye is amused. The snow was a little moist and the weather rather mild."); December 20, 1859 ("December. 11th was a lodging snow, it being mild and still, like to-day (only it was not so moist). Was succeeded next day noon by a strong and cold northwest wind.")

A gentle and uninterrupted susurrus. See April 18, 1855 ("I hear a susurrus in the shrub oak leaves"); November 1, 1857 ("When I enter the woods I notice the drier crispier rustle of withered leaves on the oak trees, – a sharper susurrus.")