METEOROLOGICAL OBSEEVATOEY 



Hatcli Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE. 



^^IvIiiEiR-ST. 



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



Height of barometer above groiuid, 51 ft. Aboi'e sea teTc/, 2yj.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 172. 



APRIL, I903. 



MONTHLY SUMMARY. 



Vreaaure, In inches. 

 Maxumini reduced to freezing, 30.15, 6tli, 8 A. 

 Minimum reduced to freezing, 29,01, 4th, i a. 

 Reducedt maximum reading, 30.46, 6th, 8 A. 

 Reduced^ minimum reading, 29.31, 4th, i a 



Mean tri-daily reduced, 29.872 



Montlily range • i.i5 



*Alr Tetnperatiire. In Degrees Falir. 



Hfghest, 84.0, 30th, 2.30 P. 



Lowest, 22.0, 6th, 6 a. 



Mean hourly, 46.9 



Mean of means of max. and min., .... 47.1 



Mean sensible (wet bulb), 4i-7 



Monthly range ■• 62.0 



Highest mean daily, 66.6, 30th 



Lowest mean daily, 30.6, 5th 



Mean maximum, 59.3 



Mean minimum, 35° 



Mean daily range 24.3 



Greatest daily range, 43.5, 2Sth, 29th 



Least daily range, 7oi i6th 



Hiiiniditi/. 



Mean dew point 34-' 



Mean force of vapor, 354 



Mean relative humidity, 64.7 



Precipitation. In inches. 



Total precipitation 2.30 



Number of days on which .01 inch or more 



rain or melted snow fell, 9 



Tlninder and Lig/itninff, 3rd. 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wiud. 



Total movement 5125m. 



Greatest daily movement, . . . . 402m., 17th. 



Least daily movement 18m., 23rd. 



Mean daily movement 171 ni. 



Mean hourly velocity 7.1 m. 



Maximum pressure per square foot, 12.5 lbs.= 



50 m. per liour, iSth, 12.30 p., W.S.W. 

 Prevailing Direction, West Northwest. 



Summary. 



Northwest, 13 per cent. 



West, Northwest, 17 " " 



South Southeast, 13 " 



West, . 10 ■' 



North Northwest, 10 " 



North, Norththeast 10 " " 



Otiier directions, 27 " "' 



1f'eat7iei'. 



Mean cloudiness observed, .... 50 per cent. 

 Total cloudiness recorded by tiie Sun 'i'her- 



mometer 203 hrs.=5o per cent. 



Number of clear days, 9 



Number of fair days 13 



Number of cloudy days S 



J{ riff lit Sunshine. 



Number of hours recorded. . . . 199 Ins. = 50* 

 Jtain, 2d, 3d, 4th, 7th, Sth,9fh, 10th, 15th, i6th. 

 Snoiv, 4th. 

 Galen, 3; miles or more per hour, 36ni. 4tii, 



W.: '48 ni. 5th. W.N.W. : 46 m. i7tli, \. 



N.W.: 50 m. i8th. W.S.W. ; 36 m. 2C)tii, 



W.N.W. ; 39 ni. 30th, S.S.E. 

 Fronts, I St, 6th. 



