Massachusetts Ag,Ticnltiir;il Cnllpo-p, 



AMHERST, ivl. 



BULLETIN No. 416. 



AUGUST, 1923 



Meteorolooical Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPEIIIMENT 



STATION. 



Latitude, 42° 23' 48,5" N. Longitude 72* 31' 10" \V. 



Heii^ht of hafometer above grouiui, 31 ft. Above sea level, 2yj.^ ft. 

 Height oj IVifui Instruments y 2 ft. Time used, y^tJiMer. 



MONTHLY SUMMARY. 



Pressiiie. In inches. 

 Maximum reduced to freezing, 29.91, 27th 9A. 

 Minimum reduced to freezing, 29.19, 22d. ia. 

 Reduced maximum reading, 30.20. 29th 9A. 

 Reduced minimum reading, 29.48, 22d, lA 



Mean semi-daily reduced 29.956 



Monthly range 72 



Air Te 



iiil>eraiur«. 



In Degrees Fahr. 



Highest 94.0,4th, 3P 



Lowest 37 5, 24th, 6a 



Mean hourly 66.8 



Mean of means of max. and min 67.6 



Mean sensible (wet bulb) 59. S 



Monthly range 56.5 



Highest mean daily 77.5, 5tli 



Lowest mean daily 56.0, 23d 



Mean maximum 82.2 



Mean minimum 53,0 



Mean daily range 29.2 



Greatest daily range 40.5,10th 



Least daily range 11.5,12th 



Hnmidity. 



Mean dew point 56.5 



Mean force of vapor 613 



Mean relative humidity •;•] 



Precipiiu<ion. In inches. 



Total precipitation, in inches 2.55 



Number of days on which .01 inch or more 

 rain fell 10 



Wind. 



Total movement 3312m 



Greatest daily movement 301m, 22d 



Least daily movement 47m, 4th 



Mean daily movement 107m 



Mean hourly velocity 4,5m 



Maximum pressure per square foot, 6.5 Ibs^ 



36m per hour, 21st, 3 p., S. 

 Maximum velocity for 5 minutes, 24m per 



hour, 2ist, 3 p., S. 

 Prevailing direction, West, Southwest. 



Summary. 



West Northwest 10 per cent 



Northwest 13 " 



South 10 " 



Southwest 13 " 



South Southwest 32 " 



Other directions 22 " 



Weather. 



Mean cloudiness observed .... 27 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 121 hours = 29 per cent. 



Number of clear days 12 



Number of fair days 17 



Number of cloudy days 2 



Bright Sunshine. 



Number hours recorded, 308 = 71 per cent. 

 Rain, 3d, 7th, 12th, 13th, 15th, 19th, 21st, 22d, 

 25th, 2Sth, 29th. 



Thunder and Li^htninii, 12th, 15th, 19th, 



2ISt, 22d. 



Hail. 15th. 



Gales, 35 or more miles per hour, 36m, 21st, 

 S.; 35m, 22d, N.W. 



