BULLETIN No. 368. 



AUGUST, 1919 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 51 ft. Above sea level, 2jj.j ft. 

 Height oj Wind Instruments Y2 ft. Time used, y^thMer. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Ma-ximum reduced to freezing, 29. 99, 12th, 8 A 

 Minimum redliced to freezing, 29.35, Sth, 3 A 

 Reduced maximum reading . 30.28, 12th, 8 A 

 Reduced minimum reading, 29.64, 8th, 3 A 



Mean semi-daily reduced 29.944 



Monthly range 0.64 



*Air Temperaiure. In Degrees Fahr. 



Highest 88.0, 24th, 2 P 



Lowest 43.0, loth, 6 A 



Mean hourly 6 



Mean of means of max. and min 65. 8 



Mean sensible (wet bulb) 60.9 



Monthly range 45.0 



Highest mean daily 73.0, 7th 



Lowest mean daily 57.9, 27th 



Mean maximum 77.0 



Mean minimum 54.6 



Mean daily range 22.4 



Greatest daily range 36.5,10th 



Least daily range 5.0, iSth 



Hnmidity. 



Mean dew point 58.3 



Mean force of vapor 632 



Mean relative humidity 77.3 



Precipitation. In inches. 



Total precipitation, in inches 4. Si 



Total snow, in inches 



Number of days on which .01 inch or more 



rain fell 11 



•Temperature in ground shelter, 

 "Reduced to freezing and sea-level. 



Wind. 



Total movement 3210 m 



Greatest daily movement 235m, 14th 



Least daily movement .... 43m, lot'i, nth 



Mean daily movement 104m 



Mean hourly velocity 4-3 ni 



Maximum pressure per square foot, 3.5 lbs 



26m per hour, 31st, 3P, S. 

 Maximum velocity for 5 minutes, 22m per 



hour, Sth, I2M, W.S.W. 

 Prevailing direction. Southwest. 



Summary. 



South 19 per cent 



South Southwest 29 " " 



Southwest 10 ■' " 



Northwest 10 " " 



Other directions 32 " " 



Weather. 



Mean cloudiness observed .... 44 per cent 

 Total cloudiness recorded by tlie Sun 



Thermometer . .170 hours = 40 per cent. 



Number of clear days 11 



Number of fair days 12 



Number of cloudy days 8 



Bright Sunshine. 



Number hours recorded, 259 hrs,= 60 per cent. 

 Rain, ist, 5th. 6th, 13th, 14th, iSth, igth, 2ist, 



24th, 27th, 30th, 31st. 

 Thunder and Liahtnin^, 6th. 21st, 24th, 



31st. 

 Hail,24th. 

 Gales. 35 miles or more per hour . None. 



