METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



.A^IvIiiERST. 



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



Height of barometer above ground, 51 ft. Above sea /ei>el, 2YJ.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 199. 



JULY, 1905. 



MONTHLY SUMMARY. 



Hresmtre. In inches. 

 Maximum reduced to freezing, 29.86, i6th, 8 A. 

 Minimum reduced to freezing, 29.28, 31st, 4 A. 

 Reducedt maximum reading, 30.15, i6th, 8 A. 

 Keducedt minimum reading, 29.57, 3'st, 4 A. 



Mean semi-daily reduced 29.94S 



Monthly range 0.58 



*Air Teinperutiire, In Degrees Fahr. 



Highest, 93.0, 10th, 2:30?. 



Lowest, 46.0, 27tli, 5:30 A. 



Mean hourly, 71. i 



Mean of means of max. and min.,^ . . . . 71.S 



.Mean sensible (wet bulb), 65.6 



Monthly range 47.0 



Highest mean daily, 81.3,18th 



Lowest mean daily, 59.0, 24th 



Mean maximum, 82. 9 



Mean minimum 60.6 



Mean daily range 22.3 



Greatest daily range, . . 34.5, 22d, 27th, 28th 

 Least daily range, 4.5, zd 



Hiitnidity. 



.Mean dew point 63.2 



Mean force of vapor, 748 



Mean relative humidity, 79.1 



Precipitation. In inches. 



Total precipitation, 2.63 



Number of days on which .01 inch or more 

 rain or melted snow fell, 15 



* Tem.perature in ground shelter. 

 Reduced to freezing and sea-level. 



lyiud. 



Total movement, 3464 m. 



Greatest daily movement, . . . , 245 m., 2d 



Least daily movement 19 ni. ,24th 



Mean daily movement mm. 



Mean hourly velocity, . 4.6m. 



Maximum pressure per square foot, 9.0 lbs.= 



43 m. per hour, loth, 4 p., W.S.W. 

 Prevailing Direction. West Southwest. 

 Summary. 



South, Southwest, . 26 percent. 



West, 19 " " 



Southwest, . 13 " " 



Northeast, 10 " " 



Other directions, 32 " " 



Weather. 



Mean cloudiness observed, .... 55 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, .... 199.5 hrs. =43 per cent. 



Number of clear days, 6 



Number of fair days, 19 



Number of cloudy days, 6 



Bright Sunshine. 



Number of hours recorded, . . 2625 hrs. = 57it 



Rain, 2d, 3d, 8th, gth, loth, nth, 13th, 14th, 



17th, 19th, 23d, 24th, 26th, 29th. 30th, 31st. 



Onles, 2S miles or more per hour, 43 m. loth, 



W.S.W. ; 39 m. 2rith N.W. 

 TJmnder and TAffhfnino , i'lth, 9th, loth, 



nth, 13th, 14th, 17th, 79th, 26th, 30th. 

 Hail, 26th. 



