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