BULLETIN No. 382. 



OCTOBER, J 920 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, S^ fi- Above sea level, 2jj.^ ft. 

 Height oj Wind Instruments J2 ft. Time used, y^thMer. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 30.10, 18th, 9 A 

 Minimum reduced to freezing, 28.97,1st, 3 a 

 Reduced maximum reading . 30.39, iSih, g A 

 Reduced minimum reading, 29.26, ist, 3 A 



Mean semi-daily reduced 30.071 



Monthly range 1.13 



*Air Temperature. In Degrees Fahr 



Highest 81.5, gth, 3:30 p 



Lowest 29.5, 7th, 6 A 



Mean hourly 55-4 



Mean of means of max. and min 56.4 



Mean sensible (wet bulb) 51.3 



Monthly range 52.0 



Highest mean daily 66.8. 22d 



Lowest mean daily 41.8, 30th 



Mean maximum 6S.4 



Mean minimum 44 4 



Mean daily range 24.0 



Greatest daily range 44.0, 7th 



Least daily range 9.5. 5fh 



Humidit}'. 



Mean dew point 49.3 



Mean force of vapor 417 



Mean relative humidity 86.7 



Precipitation. In inches. 



Total precipitation, in inches 1.54 



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 318S m 



Greatest daily movement 349ni, 1st 



Least daily movement m 6th 



Mean daily movement 103m 



Mean hourly velocity 4-3 ni 



Maximum pressure per square foot, 12.0 lbs"= 



49m per hour, ist, 3A, S.S.W. 

 Maximum velocity for 5 minutes, 40m per 



hour, ist, 2A, S.S.W. 

 Prevailing direction. West Southwest. 



Summary. 



South Southwest 23 per cent 



Southwest 13 ■' " 



North Northwest 10 " " 



Northwest 10 " " 



West Southwest 10 " " 



West 10 " " 



Other directions 24 " " 



Weather. 



Mean cloudiness observed .... 48 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 148 hours = 43 per cent. 



Number of clear days g 



Number of fair days 10 



Number of cloudy days 12 



BriiJht Sunshine. 



Number hours recorded, 196 hrs, = 57 per cent. 

 Kain. 1st, 5th. i6th, 26th, 27th, 2Sth, 29th. 

 Thunder and Lightning, 29th. 

 Frost, 7th, 24th. 

 Gales, 49ni, ist, S.S.W. 



