LIBRARY Of THE 



:assarhiisftts Ajrriciiltiinil College, 



AMHERST, MASS. 



BULLETIN No. 406. 



OCTOBER. 1922 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGllICULTURAL EXPEIIIMENT 



STATION. 



Latitude, 42° 23' 48.5" N. Longitude 72* 31' lo" VV. 



Height of harometer above grounJ, jr ft. Above sea level, 2'/j.^ ft. 

 Height oj Wind Instruments J 2 ft. Time used, y^ih Mer. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 30.18,13111, 12 P 

 Minimum reduced to freezing^, 29.21, 25th. 3 p 

 Reduced maximum reading 3049, ijth,i2 p 

 Reduced minimum reading, 29.50, 25th, 3 p 



Mean semi-daily reduced 59.988 



Monthly range 099 



Air Teniperalure. 



In Degrees Fahr. 



Highest 88.5, 2d, 4P 



Lowest 20.5,;2ist, 7:30 A 



Mean hourly 5o-5 



Mean of means of max. and min 51.7 



Mean sensible (wet bulb) 44.9 



Monthly range 6S.0 



Highest mean daily 68.6, 5th 



Lowest mean daily 36.3,21st 



Mean maximum 63.3 



Mean minimum 40.2 



Mean daily range 23.1 



Greatest daily range 39.0, 2d 



Least daily range 5.0, 7th 



Humidity. 



Mean dew point 40.3 



Mean force of vapor 362 



Mean relative humidity 75.5 



Precipitation. In inches. 



Total precipitation, in inches 2.55 



. Number of days on which .01 inch or more 



rain fell 6 



•Temperature in ground shelter. 

 "Reduced to freezing and sea-level. 



Wind. 



Total movement 4670 lu 



Greatest daily movement 322m, 31st 



Least daily movement 21m, 2d 



Mean daily movement 151m 



Mean hourly velocity 6.3ni 



Maximum pressure per scjuare foot, 9.0 lbs = 



42m per hour, 23d, 9P,S.S. W.; 24th, iiA 

 N.W. 

 Maximum velocity for 5 minutes, 27 m per 



hour, 24th, 1 1 A., N.W. 

 Prevailing direction, WestJSouthwest. 



Summary. 



South Southwest 29 per cent 



West Southwest 13 " " 



Northwest '3 '' " 



North 10 " " 



North Northeast 10 " '' 



Other directions 25 " " 



Weather. 

 Mean cloudiness observed .... 32 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 151 hours = 44 per cent. 



Number of clear days 8 



Number of fair days 13 



Number of cloudy days 10 



Bright Sunshine. 



Number hours recorded, 190 = 56 per cent. 



Rain, 7th, 8th, loth, nth, 17th, 23d. 



Frosts. 14th, 20th, 2ist, 2Sth, 29th,3oth. 



Ice formed, 21st. 



Thunder and Li&htninii, 8th, 23d 



Gales. 4ini, iSth: \V.; 42m, 23d, S. S. W.: 42m. 



24th N. \V.; 36m. 30th. N.; 35m. 31st, N. 



