UB«KRY or THt 



BULLETIN No. 462. AMHEiRSTtJUl^^. 1927 



Meteorolooical Observations 



MASSACHUSETTS 



AGlllCULTUIUL EXPEIIIMENT 



STATION. 



L;\titude, 42° 23' 48.5" N. Longitude 72' 31' 10" W. 



Hei,^ht of barometer above ground, jr ft. Above sea level, 27J.5 ft. 

 Height oj Wind Instruments J 2 ft. Time used, j^thMer. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Mnximuni reduced to freezing, 30.01. 18th, S A 

 Minimum reduced to freezing;, 29.33, loth, 7 P. 

 Reduced maximum reading, 30.30, i8th,8A. 

 Reduced minimum reading, 29.61, 10th, 7 p. 



Mean semi-daily reduced 29.9S2 



Monthly range 0.69 



Air Temperature. 



In Degrees Fahr. 



Highest 8g.o, 23d, i p. 



Lowest 37.5, 2nd, 5:30 A. 



Mean hourly 62.4 



Mean of means of max. and min 61.9 



Mean sensible (wet bulb) 58. 6 



Monthly range 5i-5 



Highest mean daily 73.6, 23d 



Lowest mean daily 55.2, 15th 



Mean maximum 74.4 



Mean minimum 49.4 



Mean daily range 25.0 



Greatest daily range 35.5, i6th 



Least daily range 8.0, iqth 



Humidity. 



Mean dew point 56.0 



Mean force of vapor 573 



Mean relative humidity 80.2 



Precipitation. In inches. 



Total precipitation, in inches 3,37 



Number of days on which .01 inch or more 

 rain fell i 



M'ind. 



Total movement 3475m 



Greatest daily movement 242ni, 6th 



Least daily movement 45m, 3d 



Mean daily movement ii6m 



Mean hourly velocity 4.8ni 



Maximum pressure per square foot, 13.0 lbs = 



51m per hour, 5th, 3 P. S.S.W. 

 Maximum velocity for 5 minutes, 30m per 



hour, 15th, 2 p., S. 

 Prevailing direction, West Northwest 



Summary. 



South 20 per cent 



North 17 " 



Northwest 13 " 



Northeast 10 ' 



West 10 ' 



South Southwest 10 ' 



Other directions 20 ' 



Weather. 



Mean cloudiness observed .... 48 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 256 hours = 56 per cent 



Number of clear days i 



Number of fair days 16 



Number of cloudy days 13 



Briiiht Sunshine. 



Number hours recorded, 201 = 44 per cent. 



Rain. 4th, 5th, loth, 12th, 14th, 15th, igth,22d, 

 23d, 25th, 26th, 27th, 2Sth, 29th, 30th. 



Thunder and Litihtninii. loth, 15th, 33d, 

 25th, 27th. 



Hail. 15th. 



Gales, 35m, ist, N.: 35m, 4th, S.; 51m, 5th, 

 S.S.W.: 38m, loth, N.E.; 39m, 15th, S.: 

 36m, 25th, S.; 36m, 27th, S. 



