138 STATE BOARD OF AGRICULTURE. 



MONTHLY METEOROLOGICAL SUMMARY, LANSING, MICHIGAN, DECEMBER, 1920. 



Barometer — Mean, 29.90 inches; highest, 30.44 inches, on 21st; lowest, 29.00 inches, on 14th.. 



Temperature— Highest, 56°, on 13th; lowest, 3°, on 28th; greatest daily range, 25°, on 14th; least daily range, 3°, on 10th; 

 normal for month, 26.8°; excess or deficiency this month, +3.8°; accumulated excess or deficiency since January Ist, — 139°; 

 ayerage daily, same period, — 0.4°; highest in 35 years, 62°; lowest, — 24°. 



Precipitation (in inches) — Total amount, 3.94; normal, 2.08; excess or deficiency this month, -1-1.86; since January Ist, — 2.71 ; 

 greatest amount in any 24 hour period, 0.81, on 4th; total snowfall, 9.9. 



Wind— Prevailing direction, west; total movement, 5,889 miles; average hourly velocity, 7.9 miles; maximum yelocity 32, from 

 the southwest, on 14th. 



Dates of — Auroras, 0; dense fog, 0; sleet, 30; thunderstorms, 0; halos: solar, 0; lunar, 0; frost: killing, — ; heavy, — ; light, — . 



DEWEY A. SEELEY, 



Meteorologist. 



