METEOROLOGICAL OBSERVATORY 



01' THE 



Hatcli 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. 89. 



MAY, 1896. 



MONTHLY SUMMARY. 



7th 



. 29.45. 7 A., 31st 



. 30.48, 9 A., 7tli 



29.73, 7 A., 3l8t 



. . . 30.0S3 



0.7.T 



Pressure. In inches. 

 Actual maxinuim reading, . 30.20, 9 

 Actual minimum reading, . 

 Reduced maximum reading. 

 Reduced minimum reading. 

 Mean reduced to sea level, 



Monthly range 



*Air Temperature. In Degrees Fahr. 



Highest 93.8; 94.3,10th 



Lowest 35.5; .32.0,1st 



Mean 62.4. 



Monthly Range, 58.3; 62.3 



Highest mean daily 81.0, 10th 



Lowest mean daily 48.6, 6th 



Mean maximum 75.4; 74.6 



Mean minimum 49.9; 47.5 



Mean daily range, 25.5; 27.1 



Greatest daily range, 43.5; 43.8; 9th 



Least daily range 10.1; 10.5, 2l8t 



Humidity 



Mean dew point 48.3 



Mean force of vapor 0.610 



Mean relative humidity . . 62.5 



Wind. 

 Prevailing Directions. 



South, 16 per cent 



South West 13 " " 



West 13 " " 



South South West, 16 " " 



Other directions, . ' 42 " " 



Total movement 4838 m. 



Greatest daily movement, . . . 308 m., 18th 



Least daily movement, 77 ni. ,15th 



Mean daily movement, 156 m. 



Mean liourly velocity ..6m. 



Maximum pressure per square foot, 25 lbs. 



=71 m. per hour, 18th, 8 A. 



Precipitation. In inches. 



Total precipitation, 2.58 



Number of days on which .01 inch or more 



rain fell, 7. 



WeatJier. 



Mean cloudiness observed, ... 40 per cent. 



Total cloudiness recorded by the Sun Tlier- 

 mometer, . . . 1.56 hours or 35 per cent. 



Number of clear days U 



Numl)cr of fair days 10 



Number of cloudy days 7 



Bright Sunshine. 



Number of Hours recorded, 297 hours or 65 jt 



Rain, 3d, 9th, 11th, 14lh, 1.5th, 17th, 18th, 19th, 

 2l8t, 24th, 25th, 26th, 28th, 29th, 31st. 



Last frost, 1st; 20th in lowlands. 



Gales, of 35 or more miles per hour, 37,5th, 

 N.W. ; 49, 10th, W.N.W. ; 35, 12th, N.; 46, 

 13th, N.N.IC.;42, 16th,W.; 71,18th,W.; 36, 

 19th,N.W.; 35, 26th, S.S.W.; 35, 27th, W. 

 S.W.; 40, 30th,S.W. 



Thunder and Lightning, . 9th, 19th, 28th. 



♦The first figures denote readings at top of tower, the second at base. 



