BULLETIN No. 363. 



MARCH, 1919 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



Latitude, 42° 23' 48,5" N. Longitude 72° 31' 10" W. 



Height of barometer above ground, ^i ft. Above sea level., ^73-5 ft' 

 Height oj Wind Instntments Y2 ft. Time used, y^thMer. 



MONTHLY SUMMARY. 



Pressnie. In inches. 

 Maximum reduced to freezing, 30.61, 15th, 8 A 

 Minimum reduced to freezing, 28. 89, 2Sth, 12 m 

 Reduced maximum reading . . 30.92, 15th, 8 a 

 Reduced minimum reading,2q.2o, 28th, 12 m 



Mean semi-daily reduced 3o-ii5 



Montlily range 1.72 



*Air Temperature. In Degrees Fahr. 



Highest 68.0, 2ist, 3 p 



Lowest 12.0, 14th, 7A 



Mean hourly 37 8 



Mean of means of max. and min 38.5 



Mean sensible (wet bulb) ' 33.- 



Monthly range •. 56.0 



Highest mean daily 55.6, 21st 



Lowest mean daily 23.5, 29th 



Mean maximum 48. i 



Mean minimum 28.8 



Mean daily range 19.3 



Greatest daily range 38.5, 26th 



Least daily range 4.5,16th 



Hnmidity. 



Mean dew point 26.8 



Mean force of vapor 226 



Mean relative humidity 70.6 



Precipitation. In inches. 



Total precipitation, in inches 4.22 



Total snow, in inches 2.0 



Number of days on which .01 inch or more 



rain fell 11 



Days of sleighing. None 



•Temperature in ground shelter. 

 ••Reduced to freezing and sea-level. 



Wind. 



Total movement 7361 m 



Greatest daily movement 580m, 29th 



Least daily movement 27m, 17th 



Mean daily movement 237m 



Mean hourly velocity 9.9 m 



Maximum pressure per square foot, 14.0 lbs 



53m per hour, 28th, lop, N.W. 

 Maximum velocity for 5 minutes, 30m per 



hour, 28th, 7P. N.W. 

 Prevailing direction. Northwest. 



.Summary. 



Northwest 10 per cent 



North Northw^est 13 " " 



North 19 " " 



West Northwest 13 •' " 



South Southwest 10 " " 



Other directions 35 " " 



Weather. 



Mean cloudiness observed .... 51 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 139 hours = 37 per cent. 



Number of clear days 12 



Number of fair days 12 



Number of cloudy days 7 



Bright Sunshine. 



Number hours recorded, 232 hrs,= 63 per cent. 



Rain. ist,5th. 9th, 16th, 17th, 18th, 19th, 

 27th, 2Sth, 29th, 31st. 



Snow. l6th, 2Sth, 29th, 30th, 31st. 



Hail. 28th. 



Gales, 35 miles or more jjer hour : 39m., 

 ist, S.W.; 45m, loth, W.N.W.: 36m, 22d, 

 N.; 53m, 28th, N.W.; 4;m, 29th, N.W. 



