b 



METEOROLOGICAL OBSERVATORy 



llatcli Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Latitude, 42° 23' 48.5" N. Longitude 72° 31' 10" W. 



Height of barometer above ground, 51 ft. Above sea level, 2'/j.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 135. 



MARCH, 1900. 



MONTHLY SUMMARY. 



Pressure, In inches. 



Maximum reduced to freezing, 30.27, 8th, 8 a. 

 Minimum reduced to freezing:, 28.75, 2d, i A. 

 Reducedt maximum reading, 30.59, 8th, 8 A. 

 Reducedt minimum reading, 29.06, 2d, i A. 



Mean tri-daily reduced, 29.948 



Monthly range, . . . . • 1.52 



*Air Temperature. In Degrees Fahr. 



Highest, 49.0, 19th, 3 p.; 30th, 3 p. 



Lowest 3-0, iSth, 6 a. 



Mean hourly, 29.5 



Mean of means of max. and min 29.1 



Mean sensible (wet bulb), 26.6 



Monthly range, ifi.o 



Highest mean daily, 40-0, 23d 



Lowest mean daily 15.4, 12th 



Mean maximum, 38.4 



Mean minimum, 19.S 



Mean daily range, 1S.6 



Greatest daily range, 33.5, 9th 



Least daily range, 7.5, 21st 



Humidity. 



Mean dew point, 19-3 



Mean force of vapor, 175 



Mean relative humidity, . . . • ..... 67.8 

 Precipitation. In inches. 



Total precipitation, . • 5.76 



Number of days on which .01 inch or more 



rain or melted snow fell, O-o 



Snow total in inches, 13.5 



Snow on ground at end of month, . . o inches. 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 5602 m 



Greatest daily movement, .... 317 m., 12th 



Least daily movement, 23 m., 26th 



Mean daily movement 181. o m. 



Mean hourly velocity, 7-5 rii- 



Maximum pressure per square foot, 16.0 )bs.= 



57 m. per hour, 2d, 9 A., N.W. 

 Prevailing Direction, North West. 

 Summary. 



North, 13 per cent. 



Northwest, 35 " " 



North. Northwest, 10 " " 



Southwest, 16 " " 



Other directions, 26 " " 



WentJier. 



Mean cloudiness observed, .... 47 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 155 hrs.=42 per cent. 



Number of clear days, -9 



Number of fair days, 17 



Number of cloudy days, 5 



Bright Sunshine. 



Number of hours recorded, . . . 216 hrs. = 58?( 



Rain, 1st, 2d, 5th, 6th, 16th, )8th, 19th, 20th, 

 23d, 26th, 27th. 



8nou; ist, 2d, 5th, 6th, 15th, i6th, i8th, 26th, 

 27th. 



Sleet, 6th, i6th. 



Oales, 35 miles or more per hour, 57m., 2d, 

 N.W.; 3Sm., 3d, N.N.W.; 38m., 5th, 

 N.N.E.; 53m., 7th, N.W.; 40m., nth, 

 N.W.: 49m., i2th, N.N.E.: 44m., 17th, 

 S.S.W.; 35m., i9th,S.W.; 43m.,2ist,N.W.; 

 39m., 23d, N.W.; 36m., 28th, N.W.; 36m., 

 31st, N. 



No. days sleighing 4 



