BULLETIN No. 35 



MARCH. 19 18 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGHICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above groiuid, 51 ft. Above sea level, 273-5 fi- 

 Height oj Wind Instrn/ne/its 72 ft. 



MONTHLY SUMMARY. 



Pressuie. In inches. 

 Maximum reduced to freezing, 30.14, nth, loA 

 Minimum reduced to freezing, 29.14, 15th, 3 A 

 Reduced maximum reading . . 30.46, nth, ioa 

 Reducedt minimum reading, . 29.45, 15th, 3 A 



Mean semi-daily reduced 29.9S9 



Monthly range i.oi 



*Air Temperature. In Degrees Fahr. 



Highest 69 o, 31st, 4 p 



Lowest '. . S.5, nth, 7 a 



Mean hourly 34-9 



Mean of means of max. and min 35.4 



Mean sensible (wet bulb) 30 3 



Monthly range 60.5 



Highest mean daily i 1.3, 31st 



Lowest mean daily 18.6, nth 



Mean maximum 47-0 



Mean minimum 23.9 



Mean daily range 23 



Greatest daily range ,• • • 36-5i3>st 



Least daily range 6.5, ist 



Humidity. 



Mean dew point 24.6 



Mean force of vapor 203 



Mean relative humidity 71.9 



Precipitation. In inches. 



Total precipitation, in inches 2.91 



Total snow, in inches 9.5 



Number of days on which .qi inch or mcjre 



rain fell S 



Days of sleighing, ... 10 



•Temi)erature in ground shelter. 

 ••Reduced to freezing and sea-level. 



Wind. 



Total movement 5791 ni 



Greatest daily movement | 606m, 3d 



Least daily movement ....... 37m, 21st 



Mean daily movement 184m 



Mean hourly velocity 7.6 m 



Maximum pressure per square foot, 18.0 lbs = 



60m per hour, 3d, 2 A,^N.W. 

 Maximum velocity for 5 minutes, 3Sm per 



hour, 2d, 2 A, N.W. 

 Prevailing direction. West Northwest. 



Summary. 



South Southwest 13 per cent 



North Northwest 19 " 



Northwest 23 " 



West 10 " 



Southwest 10 " 



Other directions 25 " 



Weather. 



Mean cloudiness observed .... 36 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . wj hours = 32 per cent 



Number of clear days 13 



Number of fair'days 14 



Number of cloudy days 4 



Bright Sunshine. 



Number hours recorded, 252 hrs, = 68 per cent 

 Kaiu, ist, 6th, loth, 14th. 

 Snow, 4th, 5th, 7th, 9th, loth, 14th. 

 Hail, 1st, 9th, loth. 

 Thunder and Lightning, 14th. 

 Gales, 60m, 3d. NW.; 45"i, 'ot''. N.: 36m, 

 i2th,S.S.W.: 47m, 15th, N.W. 



