BULLETIN No. 450. 



JUNE 1926 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



Latitude, 42° 23' 48.5" N. Longitude 72° 31' 10" \V. 



Height of barometer above ground, ^T ft. Above sea level, 2yj.^ ft. 

 Height oj Wind Instruments J 2 ft. Time used, y^t/iMer. 



MONTHLY SUMMARY. 



Pressuie. In inches. 



Maximum reduced to freezing, 29.98, 17th, 6a. 

 Minimum reduced to freezing, 29.29, 15th, 11 A. 

 Reduced ma.ximum reading, 30.29. 17th, 6 A. 

 Reduced minimum reading, 29.59,15th, iia. 



Mean semi-da^y reduced 29.915 



Monthly range 0,70 



Air Tempera<ure. In Degrees Fahr. 



Highest S6.5, 25th, 3 p. 



Lowest 35.0,17th, 5.30 A. 



Mean hourly 61.3 



Mean of means of max. and min 616 



Mean sensible (wet bulb) 57.2 



Monthly range 51.5 



Highest mean daily 72.3, 30th 



Lowest mean daily 51.0, 5th 



Mean maximum 73.7 



Mean minimum 49.4 



Mean daily range 24.3 



Greatest daily range 39.0, 17th 



Least daily range 7.0, 7th 



Hi 



uiuidiiy. 



Mean dew point 54.1 



Mean force of vapor 553 



Mean relative humidity 78.9 



Precipitation. In inches. 



Total precipitation, in inches 2.03 



Number of days on which .01 incii or more 

 rain fell 11 



Wind. 



Total movement 395im 



Greatest daily movement 292m, 3rd 



Least daily movement 46m, 23rd 



Mean daily movement 131m 



Mean hourly velocity 5Sm 



Maximum pressure per square foot, 9.0 lbs = 



43U1 per hour, 2d, 6 P., S.W. 

 Maximum velocity for 5 minutes, 24m per 



hour, 3d, 8 A., W.N.W. 

 Prevailing direction. West Southwest. 



Summary. 



South Southwest 23 per cent. 



Southwest 13 



Northwest 13 



South 10 



West 10 



East 10 



Other directions 21 



Weather. 



Mean cloudiness observed .... 43 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 211 hours = 46 per cent 



Number of clear days 6 



Number of fair days 16 



Number of cloudy days 8 



Bright Sunshine. 



Number hours recorded. 246 = 54 per cent. 

 Kain. ist, 2d, 5th, 7th, 8th, gth, 14th, 15th, 



i8th, 22d, 2;th. 26th. 

 Thunder and I.iiihtnin)i, 2d, Sth, 15th, 



26th. 

 Frost on Low Ground, I7tii. 

 Gales, 43I11- 2c'. •'^■W. 



