Colder and overcast

March 21. 

Colder and overcast. Did not look at thermometer; probably not far from 40°.

H. D. Thoreau, Journal, March 21, 1860

Colder. See March 20, 1860 ("The 15th, 16th, 17th, 18th, and 19th were very pleasant and warm days, the thermometer standing at 50° 55° , 56° , 56°, and 51° (average 53 1/2°), - quite a spell of warm weather ")

March 21.  See A Book of the Seasons, by Henry Thoreau, March 21