METEOROLOGICAL OBSERVATORY 



OF THK 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



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

 Height of Wind Instruments 72 ft. 



BULLETIN No. 162. 



JUNE, 1902. 



MONTHLY SUMMARY. 



I're.s/ture. In inclies. 

 Maximunireducedtofreezin.fi;, 30.17, ist, 7A 

 Minimum reduced to freezinp;, 28.95, 26th, lOA. 

 I\educedMnaxinium reading:, 30.^6, ist, 7 A. 

 Keducedt minimum reading, 29.24, 26tli, 10 a. 



Mean tri-daily reduced, 29.837 



Montiily range • 1.22 



*Aiv Tetnperatitre. In netjrees Fahr. 



Highest, 8q.o, 3d, 3 P. 



r.owest, 40.0, (ith, 4 A. 



.Mean iiourly, 63.5 



Mean of means of max. and min., .... 63.1 



Mean sensible (wet bulb), 58. 2 



Monthly range, 49.0 



Highest mean daily, . . 72.1,16th 



Lowest mean daily 55.4, 21st 



Mean maximum, 74.3 



Mean minimum, 51.9 



Mean daily range 22.4 



Greatest daily range, 35.o, 2d 



Least daily range, 6.0,21st 



Ifiintiiliti/. 



Mean dew point, 53.5 



Mean force of vapor, 621 



Mean relative humidity, 70.8 



yrecipitntion. In inches. 



Total precipitation, 4.54 



Xumljcr of days on which .01 inch or more 

 rain or melted snow fell, 13 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 4102m. 



Greatest daily movement, . . . . 295m., 27tli. 



Least daily movement 42m., 13th. 



Mean daily movement, 137 ni. 



Mean hourly velocity, 5.7 ni. 



Maximum pressure per square foot, )5.olbs.= 



55 m. per hour, 26th, 2 p., N. 

 Prevailing Direction, Northwest. 

 Summary. 



North, 20 per cent. 



North, Northeast 10 " " 



West, Southwest, 10 " " 



West, 13 " " 



Northwest, 17 '' " 



Other directions, 30 " " 



WeatJier. 



Mean cloudiness observed, .... 62 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 27S hrs.=6i per cent. 



Number of clear days, 4 



Number of fair days, 10 



Number of cloudy days, 16 



Jtrifflit Sunshine. 



Number of hours recorded,'. . . 179 hrs.=39it 

 Rain, 2d, 3d, 4th, 7th, Sth, lotli, 13th, iSth, 



i6th, I9tli, 2ist, 23d, 24th, 26tli, 29th, 30th. 

 Thunder and Lightning, 3d, 13th, 16th. 

 Galea, 35 miles or more per hour, 50m., 



3d, E.N.E.; 39m., Sth, W.; 36m., 12th, N.; 



35m., i6th, W.; 35m., 17th, N.N.F..; 55m., 



26th, N.; 36m., 27th, N.N.W. 



