METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE. 



^ft^ZS^I^E^tST- 



Latitude, 42" 23' 48. 5" N. Longitude 72° 31' 10" W. 



Height of barometer above ground, 51 ft. Above sea level, 2^3.3 ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 159. 



MARCH, 1902. 



MONTHLY SUMMARY. 



treasure. In inches. 

 Maxmuini reduced to freezing, 30.1Q, 15th, 7 A. 

 Minimum reduced to freezing, 28.65, 2d, 4:3op. 

 Reducedt maximum reading, 30.50, i5tli, 7 A. 

 Reducedt minimum reading, 28.95, 2d, 4:30 P.i 



Mean tri-daily reduced 29.911 



Montiily range • 1.55 



*Air Temperature, in Degrees Fahr. 



Higiiest, 65.0, 22d, 3 p., 3otli, 3 p. 



Lowest 16.5, 7th, 6 A. 



Mean hourly, 40.5 



Mean of means of max. and min 40.5 



Mean sensible (wet bulb), 37.5 



Monthly range 48.5 



Highest mean daily, 53-5, joth. 



Lowest mean daily, 26.0, 19th. 



Mean maximum 49.5 



Mean minimum, 31.6 



Mean daily range, 17.9 



Greatest daily range, 34.0,26th. 



Least daily range 5.0, 5th. gtli. 



H timidity. 



Mean dew point, 32.2 



Mean force of vapor, . . 275 



Mean relative humidity, 72.3 



Precipitation. In inches. 



Total precipitation, 5.29 



Numljer of days on which .01 inch or more 



rain or melted snow fell, 16 



S»<oir, total in inches, 9.75 



Snow on ground at end of month o 



• Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Total movement 6601m. 



Greatest daily movement 596 m., 19th. 



Least daily movement, 56m., 26th. 



Mean daily movement, 212.9 m. 



Mean hourly velocity, 8.9 m. 



Maximum pressure per square foot, 24.0 lbs.= 

 69 m. per hour, 19th, 3 p., E.X.E. 



Prevailing Direction, North. 

 Summary. 



Northeast, 13 per cent. 



West, 16 " " 



West Southwest 13 " " 



East Northeast, 29 " 



Other directions 29 " " 



Weather. 



Mean cloudiness observed, .... 66 per cent. 



Total cloudiness recorded by tiie Sun Ther- 

 mometer, 227 hrs.=6i per cent. 



Number of clear days 5 



Number of fair days, 12 



Numljer of cloudy days, 14 



Bright Sunshine. 



Numl)er of hours recorded. . . . 143 hrs. = 39K 

 Itain, 1st, 2d, 8th. 9th, iith, 13th, 16th, 171)1, 



i9tli, 20th. 27th, 2Sth. 29th, 30th, 31st. 

 Snotv, 5th, 8th, 9th. 19th. 31st. 

 Galea, 35 miles or more per nour, 3;ni.. 



2d, W.N.W.; 36m., 3d, N.W.: 41m., 6th, 



E.N.E.: 42m., 16th, W.: 40m., iSth, 



E.N.E.; 69m., igth, E.N.E. 

 No. days sleighing, 3 



