BULLETIN No. 235. 



JULY, I908. 



Meteorological Observations 



AT THK 



MASSACHUSETTS 



AGllICULTURAL EXPEKIMENT 



STATION. 



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



Height of barometer above ground, Ji ft. Above sea /evel, 2yj.^ ft. 

 Height of Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 29.97, 25th, A. 

 Minimum reduced to freezing, 29.32, iSth, 12 m. 

 Reducedt maximum reading, 30.26, 25th, o .\- 

 Reducedt minimum reading, 29.60, iSth, 12 m 



Mean semi-daily reduced, 30-039 



Monthly range 0.66 



*Air Tetnperatnre. In Degrees Fahr. 



Highest 96.0,12th, 1:30 P. 



Lowest 46.0.9th, 5 a; 17th, 5 A. 



Mean hourly, 72.5 



Mean of means of max- and min., .... 72.S 



Mean sensible (wet Inilb), 66.2 



Monthly range, 50-o 



Highest mean daily, 80.0,7th 



Lowest mean daily, 64.3, i5th 



Mean maximum, • • 85.2 



Mean minimum, 60.4 



Mean daily range, 24.8 



Greatest daily range, 40-o, 9th 



Least daily range, 9-0- 25th 



Hutnidity. 



Mean dew point, 3-i 



Mean force of vapor, 776 



Mean relative humidity, 76.6 



Precipitation. In inches. 



Total precipitation, 3.28 



Number of days on which .01 inch or more 

 rain or melted snow fell, 12 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



trind. 



Total movement, 3815m. 



Greatest daily movement, .... 283m., iStli. 



Least daily movement, 50m., 3d. 



Mean daily movement 123 ni. 



Mean hourly velocity, 5.1 m. 



Maximum pressure per square foot, 10. Ibs.= 



45 m. per hour, i8th, 12 m., S.S.W. 

 Maximum velocity for 5 minutes, 48 ni. per 



hour iSth, 12 M., S.S.W. 

 Prevailing Direction, South Southwest. 



Summary. 



West 13 per cent 



West Southwest '3 " " 



South Southeast, 16 " " 



South, ... 23 " " 



Other directions, 35 " " 



Ifenther. 



Mean cloudiness observed, . . .47 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer,) . . . 154 hrs. =33 per cent. 



Number of clear days, 10 



Number of fair days, .....' iq 



Numljer of cloudy days, 2 



Jiriffht Sunshine. 



Number of hours recorded, . . 308 lirs. = 6711 



Rain, 2d, 3d, 4th, 6th, 12th, 14th, 15th, 17th, 



i8th, 22d, 23d, 24th, 25th, 29th. 



Thunder and J[/if//t/ni»K/— 2d, 3d, 4th, 12th, 



14th, T5th, 17th, iSth, 23d, 30th, 31st. 

 Onles, 35 miles or more per hour : 35 m.. 



Sth, W.N.W.; 45111., i8th. S.S.W. 



