BULLETIN No. 339. 



MARCH, 1917 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



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

 Height oj Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressnie. In inches. 

 Maximum reduced to freezing, 30.20, 7th, 9 a 

 Minimum reduced to freezing, 29.14, 29th, i P 

 Reducedt maximum reading', 30.53, 7th, 9 A 

 Reducedt minimum reading, 29.44, 29th, i P 



Mean semi-daily reduced 30.063 



Monthly range 1.09 



*Air Temperature. In Degrees Fahr. 



Highest 58.0, 25th, 4:30 p 



26th, 4 p. 



Lowest —2.0, 7th, 7 A 



Mean hourly 33.3 



Mean of means of max. and min 33.4 



Mean sensible (wet bulb) 29.7 



Monthly range 600 



Highest mean daily 44.2, 27th 



Lowest mean daily , . . . 19.8, 19th 



Mean maximum 41.9 



Mean minimum 24.9 



Mean daily range 17.0 



Greatest daily range 43.0, 7th 



Least daily range 6.0, nth 



Hnmidiiy. 



Mean dew point 25.0 



Mean force of vapor 186 



Mean relative humidity 77.S 



Precipitation. In inclies. 



Total precipitation, in inches 3.66 



Total snow, in inches 17 



Number of days on which .01 inch or more 



rain fell 13 



Days of Sleigbiai> Ii 



* Temperature in ground shelter. 



t Reduced to freezing and sea-level. 



Wind. 



Total movement 5S04 m 



Greatest daily movement 462m, 19th 



Least daily movement 14m, 3d 



Mean daily movement 1S7 m 



Mean hourly velocity 7.8 m 



Maximum pressure per square foot, 10.5 lbs = 



46m per hour, 6th, A, N. 

 Maximum velocity for 5 minutes 33m per 



hour, 6th, lA, W.N.W. 

 Prevailing direction. West. 



Summary. 



West Southwest 13 per cent 



West 13 " " 



West Northwest 19 " " 



Northwest 13 " " 



Southwest 10 " " 



Other directions 32 " " 



Weather. 

 Mean cloudiness observed .... 50 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 139 hours = 2i7 per cent 



Number of clear days 13 



Number of fair days 10 



Number of cloudy days 8 



Bright Sunshine. 



Number hours recorded, 232 hrs, = 63 per cent 

 Rain, 4th, 8th, iith, 12th. 17th, 20th, 24th 



27th, 28th, 29th. 

 Snow, 3d, 4th, 5th, nth, 14th, 15th, 17th, 



iSth. 

 Hjail, 5th. 

 Gales, 35 or more miles per hour. 46m, 6th, 



N.; 39m, i2th, W.N.W.; 35m, 15th, N.W.; 



35m,i8th,W.;42m, i9th,W.N.W\; 36m,20th, 



S.; 43m, 23d, W.S.W..; 35m, 24th, N.W.; 



35m, 27th, S.W.; 36m, 28th, N.W. 



