Calculations of Precipitation, January-March 1811
From Daily Record, 1 November 1802-25 May 1826 (Massachusetts Historical Society).
In Jefferson’s hand on page with entries for January-February 1811.
1. during an absence from January 27. to Mar. 2. there fell 7. snows, which kept the ground covered 17. days. they were as follows
Feb. 6. .75
9 4.
12. 1.
16. .625
17. .625
22 6.
13. I. which @.148 to the inch of snow = 1.924
2. rain Feb. 25. = .167
26 = .5
.667
3. [January summary, in margin:]
rain &c. noted to Dec.1 27. 3.456
28-31 propn of 1.924 .240
3.696
[1. Jefferson meant January.]
4. [February summary, in margin:]
after deducting .240 from 1.924
for 4. days of Jan. remain 1.684
+ .667
rains of this month 2.351