BULLETIN No. 238. 



OCTOBER, 1908. 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTUKAL EXPERIMENT 



STATION . 



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



Height of /hi /v meter above ground, 31 ft. Above sea level, 2"/^.^ ft. 

 Height of Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Fregsure. In inches. 



Maxununi reduced to freezing, 3028, 22d, gA. 

 Minimum reduced to freezing, 29.12, 30th, 5 A. 

 Reduced! maximum reading, 30.59, 13th, 7 A.; 



22d, g A. 

 Reducedt minimum reading, 29.42, 3otIi, 5 A. 



Mean semi-daily reduced, 30.170 



Montlily range, 1.17 



*Air Temperature. In Degrees Falir. 



Highest, 90.5.17th, 3P 



Lowest, 23.0, 13th, 6 A.; 21st. 6:30 A. 



Mean iiourly, 51.3 



Mean of means of max. and niin 52.3 



Mean sensible (wet bulb), 45.3 



Monthly range, 67.5 



Highest mean daily 64.3,25th 



Lowest mean daily 36.9,31st 



Mean maximum, 66.2 



Mean minimum 38.5 



Mean daily range 27.7 



Greatest daily range 49.0, 17th 



Least daily range, 5.0, 26th 



Ilutniility. 



Mean dew point 41S 



Mean force of vapor 351 



Mean relative humidity, 79.0 



Precipitation. In inches. 



Total precipitation, 1.57 



Number of days on which .01 inch or more 

 rain or melted snow fell, 6 



* Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 3643m. 



Greatest daily movement, .... 45Sm., 30th. 



I-east daily movement, iom.,i6th. 



Mean daily movement 118 m. 



Mean hourly velocity, 4.9 m. 



Maximum pressure per square foot, 9.0 llis.= 



42m. per hour, 12th, lA., N.N.W.; 31st, 



iiA, W. N. W. 

 Maximum velocity for 5 minutes, 36m. per 



hour 30th, 2P., N.N.W. 

 Prevailing Direction, Southwest. 



Summary. 



South Southeast 26 per cent 



North Northwest ig " " 



West Northwest 13 " " 



East Northeast 10 " " 



Other directions, 32 " " 



Weather. 

 Mean cloudiness observed, .... 37 per cent. 

 Total cloudiness recorded by the Sun 'I'her- 



mometer,' 155 hrs.=45 per cent. 



Number of clear days, 11 



Number of fair days, 9 



Number of cloudy days, 11 



Brigtit Sunshine. 

 Number of hours recorded, . . 186 hrs.==55!{ 

 Rain, 2d, nth, 25th, 26th, 2Sth, 29th, 30th. 

 Lightning, 27th. 

 Frosts, 3d, 4th, 5th, 6th, 13th, 14th, 15th, 21st, 



2 2d, 23d. 

 Gales, 35 miles or more per honr ; 42m., 



i2th, N.N.W.:3gm. 30th, W.N. W.; 42m., 



31st, W.N.W. 



