METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of instruments above ground, 51 ft. Above sea level, 260 ft. 



BULLETIN No. 77. 



MAY. 1895. 



MONTHLY SUMMARY. 



I'fessiive. In inches. 

 Actual maximum reading, . . 30.'25, 1st, 7 A. 

 Actual minimum reading, . . 29.43, 27th, 2 P. 



Mean reduced to sea level 30.097 



Monthly range 82 



*JLir Temperature. In Degrees Falir. 



Highest 94; 92, 10th 



Lowest 34, ; 29.f>, 14th 



Mean, 61.3; 59.7 



Monthly Range 60; 62..") 



Highest mean daily, 78.; 74.7 



Lowest mean daily 46.2; 44.7 



Mean maximum 73.8; 74.2 



Mean minimum 50.4; 45.3 



Mean daily range 23.4 ; 28.9 



Greatest daily range, 38. ; 44. 



Lea.stdailj' range, S. ; 13. 



ITumidity. 



Mean dew point, 48.7 



Mean force of vapor 5848 



Mean relative humidity, 65. 



Wind. 



Prevailing Directions. 



South West 25 i>er cent. 



South, 20 " " 



North West, 13 " " 



North, 9 " " 



Other directions, 33 " " 



Total movement 4071 m. 



Greatest daily movement, . . . 238 m., 12th 



Least daily movement 21 m.; 29th 



Mean daily movement, 132 m* 



Mean hourly velocity, 5.5 m. 



Maximum pressure per square foot, 71bs.= 

 37 m. per hour, 16th, at 5 P. 



* Precipitation. In inches. 



Total pi-ccipitation, 2.07 



Weather. 

 Mean cloudiness observed, ... 46 per cent. 



Number of clear days 9 



Number of fair days, 10 



Number of cloudy days, 12 



Total cloudiness recorded by the Sun Ther- 

 mometer, . . . . 210 hours or 46 per cent. 

 Number of days on which .01 inch or more 



rain or melted snow fell, 9 



Frost, 2nd, 14th, 17th 



Rright Sunshine. 



Nunil)er of Hours recorded, 243 



Rain, 8th, 12th, 14th,15th,18th,20th,26th,27th, 



28th, 31 St. 

 Thuiuler and LigJitninff, . 4th, 8th, 31st. 



Mean Ozone, 24 per cent. 



Halos. 



Solar 4th. 



Gales, of 35 or more miles per hour, 35, 7th, 

 S. ; 35, nth, S.W. ; .37, 16th, N.W. ; .■i5,25th, 

 S.W. 



♦The firit (igures flenote readings at top of towei-, the second at base. 



