University of Idiho- 



Departnii'.it of .iiv>'--)| Arts. 



METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground, 31 ft. Above sea level, 2'jj.^ ft. 

 Height of Wind Listruments 72 ft. 



BULLETIN No. 129. SEPTEMBER. 1899. 



MONTHLY SUMMARY. 



I'resmtre. In inches. 

 Maximum reduced to freezing, 30.16, i6th, 7 A. 

 Minimum reduced to freezing, 29.28, 12th, 3 r. 



— 26tli, 4 P. 

 Reducedt maximum reading, 30.47, i6th, 7 A. 

 Reducedt minimum reading, 29 5C1, I2tli, 3P. 



— 26tli, 4 P. 



Mean tri-daily reduced 30.022 



Monthly range • 88 



*Air Temperature. In Degrees Fahr. 



Higliest, 84.0, 1st, 3 p. 



Lowest 32.5, i6th, 6.\. 



Mean hourly, 59.7 



Mean of means of max. and min 59.4 



Mean sensible (wet bulb), 55.4 



Montiily range 51.5 



Highest mean daily, 70.9, 1st 



Lowest mean daily 49.0, 14th 



Mean maximum, 71. i 



Mean minimum, 47.7 



Mean daily range 23.4 



Greatest daily range, 3S.5, 16th 



Least daily range, g.o, 2d 



IIii inidity. 



Mean dew point, 51.5 



Mean force of vapor 551 



Mean relative humidity, . . . • ... .74.0 



I'recipitiiiioH. In inches. 



Total precipitation, . • 



Number of days on which .01 inch or more 

 rain or melted snow fell, 11 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



7.90 



Wind. 



Total movement, 3967 m. 



Greatest daily movement, .... 256 m., 26th 



Least daily movement, 45 m., 21st 



Mean daily movement, 132.2 m. 



Mean hourly velocity, 5-5 m. 



Maximum pressure per square foot, 6.5 lbs.= 



36 m. per hour, 29th, 11 a., S.S.W. 

 Prevailing Direction, Southwest. 

 Summary. 



South, 10 per cent. 



South, southeast, 10 " " 



South, southwest, 17 " " 



Northwest, .... 10 " " 



Other directions, 53 " " 



Went?ier. 

 Mean cloudiness observed, .... 47 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 175 hrs. =47 per cent. 



Number of clear days, 8 



Number of fair days, 11 



Number of cloudy days, 11 



Bright Sunshine, 

 Number of hours recorded, . . . 200 hrs. =5354 



itain, ist, 2d, 3d, Sth, 9th, 12th, 19th, 20th, 

 2ist, 24th, 25th, 26th, 29th, 30tll. 



Thunder and Liyhtning, ist, 3d, Sth. 



Frost, on low lands, 14th, 15th. Heavy frost 

 i6th, 2Sth. 



Gales, 35 miles or more per hour, 36m., 29tli, 



