BULLETIN No. 306. 



JUNE. 1914 



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 fi- Above sea level, 2"/^.^ ft. 

 Height of Wind Instrumetits 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 29 99, 9th, 8 a. 

 Minimum reduced to freezing, 29.34, 20th, 11 P. 

 Reducedt maximum reading, 30.29, gth, 8 A. 

 Reducedt minimum reading, 29.64, 20th, 11 p. 



Mean semi-daily reduced, 29.952 



Monthly range 0.65 



*Air Temperature. In Degrees Fahr. 



Highest, 90.5, 24th, 3 p. 



Lowest, 39.0, 6th, 5-30 a. 



Mean hourly, 64.4 



Mean of means of ma.x. and min 64.6 



Mean sensible (wet bulb), 592 



Monthly range, 51.5 



Highest mean daily, 79-4, 26th 



Lowest mean daily, 56.5, i6th 



Mean maximum, 76.3 



Mean minimum, 52.8 



Mean daily range 23-5 



Greatest daily range, 40-5. 7th 



Least daily range 5.5,2Sth 



Humidity. 



Mean dew point, 55.7 



Mean force of vapor 609 



Mean relative humidity, ........ .76.1 



Precipitation. In inches. 



Total precipitation, 2.32 



Number of days on which .01 inch or more 



rainfell 8 



♦Temperature in ground shelter. 

 1 Reduced to freezing and sea-level. 



Wind. 



Total movement, 4468m. 



Greatest daily movement, .... 312m., 20th 



Least daily movement, 47m., 29th 



Mean daily movement 149 m 



Mean hourly velocity, 6.2 m 



Maxinmm pressure per square foot, 14.0 lbs.:= 



53m. per hour, 15th, 6 p., S. 

 Maximum velocity for 5 minutes, 24m. per 



hour, i6th, 3P., N.W. 

 Prevailing Direction, West. 



Summary. 

 North Northwest ........ 13 per cent. 



North Northeast 10 " " 



West Northwest 17 " " 



South 20 " " 



Other directions 40 " " 



Weatlier. 



Mean cloudiness observed, .... 48 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, i74hrs.=38 per cent. 



Number of clear days, 12 



Number of fair days, 11 



Number of cloudy days, 7 



Bright Sunshine. 



Number of hours recorded, . . 283 hrs=62l<. 

 Rain, 3d, 4th, 7th, 8th, 15th, 19th, 27th, 28th, 



29th, 30th. 

 Thunder and I^ightning, 15th. 

 Gales, 35 or more miles per hour : 40m, 4th, 



S.; 39m, 5th, N.N.W.; 37m, loth.W.N.W.; 



36m, 12th, W.N.W.; 53m, 15th, S.; 47m, 

 16th, N.W. 



