METEOEOLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of instruments above ground,51ft. Above sea level, 273.5 ft. ** 



BULLETIN No 99. 



MARCH, 1897. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 MuYiiniim reduced to freezing, . 30.54, Ist.TA. 

 Mininuini retlucetl to freezing, 28. 84, 2oth, 3 a. 

 lleilucedt maximum reading, 30.88, 1st, 7 A. 

 Ile(lucc<lt min. reading, . . . 29.14, 25tii,3 A. 



Mean reducedf, 30. 030, 



Monthly range, 1.741 



*Air Temperature. In Degrees Fahr. 



Highest, 59.0; 23d 



Lowest, -1.5, 1st 



Mean 32.9 



Mean of means of max. and min., .... 33.1 



Mean sensible(wet bulb) 31.1 



Monthly Kange, 60.5 



Highest mean daily 45.6, 23d 



Lowest mean daily ■. 10.8, 1st 



Mean maximum, 42.a 



Mean minimum, 24.0 



Mean tlaily range, 18.3 



Greatest (lailv range, 39.0, Ist 



Least daily range, 5.5, 20th, 25th 



Humidity. 



.Mean dew point, 2G.9 



Mean force of vapor, 204 



Mean relative humidity, ... . . 78.9 

 Wind. 



Prevailing Dii-ection, West North West. 

 Summary. 



North West,. . 10 per cent. 



West. 10 " 



West North West 26 " 



West South West 13 " 



North 10 " " 



North North East 10 " " 



South 10 " " 



Other directions, ....... 11 " " 



Total movement, ."iSOSm. 



Greatest daily movement, . . . 3J3 m., 15th 



Least daily movement, 49m., 8th 



-Mean daily movement 173.0 m. 



Mean hourly velocity, 7.2 m. 



Ma.ximum pressure per square foot,13.5 lbs.= 

 52 m. per hour, 11 a. 15th, W.N.W. ;4 P. 

 25lh W . 



Precipitation. In inches. 



Total precipitation, 3.53 



Number of days on which .01 inch or more 



rain or melted snow fell, 12 



Snow total in inches, 5. 



Weather. 

 Mean cloudiness observed, ... 56 per cent. 

 Total cloudiness recorded by the Sun Tlier- 

 mometer, ... 184 hours or 49 per cent. 



Number of clear days, 12 



Numberof fair days, 4 



Number of cloudy days, 15 



Brifflit Sunshine. 

 Number of Hours recorded, 188 hours ov 51^ 

 KaJn, 3d, 5th,9th,10th 12th,20th,21st,23d,24th. 

 Oales, of 35 or more miles per hour, 47m., 

 3d, N.W.; 51m., 4th, N.W. ; 42m., Cth, 

 W.N.W. ; 35m., 10th, N.W.; 48m., 11th, 

 W.S.W.; 51m., 13th, W.N.W.; 40m., 14th, 

 W.N.W.; 52m., loth, W.N.W ; 36m., 21st, 

 W.N.W.; 38m., 22d, S.; 52m., 2.5th, W.; 

 3,5m., 26th, W.N.W. 

 Snow, lst,2nd,.5th, 14th, 20th, 24lh, 25th, 26th, 

 27th. 



* Temperature in ground shelter. 



t Reduced to freezing and sea level. 



* * Determined from levels of B. & M. II. U. 



