BULLETIN No. 268. 



APRIL, 1911 



Meteorological Observations 



AT THE 



J^' 



MASSACHUSETTS 



AGUICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 51 ft. Above sea level, 2'jj.^ ft. 

 Height of Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 30 41, 13th, g A. 

 Minimum reduced to freezing, 29.27,7th, 3 A. 

 Reducedt maxi'mum reading, 30.71, 13th, 9 A. 

 Reducedt minimum reading, 29.57, 7th, 3 a 



Mean semi-daily reduced, 30-'44 



Monthly range 1. 14 



*Air Temperature. In Degrees Fahr. 



Highest . 86.0, 29th, 3:00 p. 



Lowest, iS.o, 4th, 6 A. 



Mean hourly, 43.7 



Mean of means of max. and min 43.5 



Mean sensible (wet bulb), 36.9 



Monthly range, 6S.0 



Highest mean daily, 64.8,29th. 



Lowest mean daily, 25-6. 2d 



Mean maximum 56.4 



Mean minimum, 30.6 



Mean daily range 25.8 



Greatest daily range 44-o, 29th 



Least daily range 8.0, 5th 



Humidity. 



Mean dew point, 301 



Mean force of vapor, 289 



Mean relative humidity, 65.2 



Precipitation. In inches. 



Total precipitation, 1.87 



Number of days on which .01 inch or more 



ram fell, • • 5 



Total snow in inches 6.5 



•Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 5738m 



Greatest daily movement,. . . . 406m., ist 



Least daily movement, 62m., 19th 



Mean daily movement 191. 3 m 



Mean hourly velocity, 8.0 m 



Maximum pressure per square foot, 9.0 lbs.= 

 42m. per hour, 16th, i p., W.N.W. 



Maximum velocity for 5 minutes, 45m. per 

 hour i6th, i P., W.N.W. 



Prevailing Direction, West. 



Summary. 



South 23 percent. 



West 13 " " 



North Northwest 10 " " 



South Southwest 10 " '* 



Other directions 44 " " 



Weather. 



Mean cloudiness observed, .... 42 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, .... io6hrs.=26 per cent. 



Number of clear days, 19 



Number of fair days, 7 



Number of cloudy days, 4 



Bright Sunshine. 



Number of hours recorded, . . 296 hrs. = 74^ 

 Rain, 5th, 14th, 15th, 19th, 20th, 30th. 

 Snow ist, 2d, 4th, 5th, gth, i6th, 19th. 

 Hail, 19th, 20th. 



F osts, 4th, 12th, 13th, iSth, 24th. 

 Gales, 35 or mote miles per hour : 41m, 2d, 

 W.N.W. ; 42m, i6th, W.N.W. 



