METEOROLOGICAL OBSERVATORY 



OF THK 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



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

 Height of Wind Instruments 72 ft. 



BULLETIN No 185. 



MAY, 1904. 



MONTHLY SUMMARY. 



Fre.BSure. In inches. 

 Maxuiuini reduced to freezing, 30.07. 3d, 2 A 

 Minimum reduced to freezing, 29.33, 20th, 2 p 

 Reducedt maximum reading, 30.37, 3d, 2 A 

 Reducedt minimum reading, 29.62, 20th, 2 p. 



Mean semi-daily reduced, 29.979 



Montiily range 0.7; 



*Air Temperature. In Degrees Fahr. 



Highest 85.0, 26th, 3 P. 



Lowest, 37-0. 3d, 5-3° a. 



Mean hourly, 60.1 



Mean of means of max. and min 60.3 



Mean sensible (wet bulb), '53 



Monthly range 48-0 



Highest mean daily, 69.0,24th 



Lowest mean daily, 49-7, '7th 



Mean maximum, 73-2 



Mean minimum, 47-3 



Mean daily range, 25-9 



Greatest daily range, 41.5,3d 



Least daily range, 6.5,19th 



Muniidity. 



Mean dew point, 48.4 



Mean force of vapor, 516 



Mean relative humidity, 69.7 



Precipitation. In inches. 



Total precipitation, 4.55 



Numter of days on which .01 inch or more 

 rain or melted snow fell, 14 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement 3S3om. 



Greatest daily movement, 289 m.,23d 



Least daily movement, 40m., 13th 



Mean daily movement, 123m. 



Mean hourly velocity, 5.1n1. 



Maximum pressure per square foot, ii.o lbs.= 



47 m. per hour, 26th, 3 p., W. 

 Prevailing Direction, South, Southwest. 

 Summary. 



South, 26 per cent. 



West, '3 " " 



Southeast, 10 " " 



South, Southeast, 10 " " 



North, Northwest, 10 " " 



Other directions, 31 " " 



Weather. 

 Mean cloudiness observed, .... 45 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, . . . . 197 hrs. =43 per cent. 



Number of clear days, 11 



Number of fair days, 10 



Number of cloudy days, 10 



Kright Simshine, 

 Number of hours recorded, . . . 256 hrs. = 57* 

 Rain, ist, 9th, loth, 15th, i6th. 17th, iSth, 

 19th, 20th, 24th, 25th, 26th, 27th, 30th, 31st. 



Hail, 26th. 



6nie», 35 miles or more per hour, 36m. ist, 

 S.S.E.; 47m. 26th, W. ; 35m. 27th, 

 W.N.W. 



ThiintlerandT/ightninff, . . . . i9th,2oth, 



26th, 25th. 



