BULLETIN No. 472. 



APRIL, 1928 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGllICULTUML EXPERIMENT 



STATION. 



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



Height of barometer above grotind, sr ft. Above sea level, 2^3. ^ ft. 

 Height of Wind fnstninieuts 72 ft. Time used, f^th Mer. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maxiniani reduced to freezing, 30.16,3rd, 5 A 

 Minimum reduced to freezing, 29.07, 19th, 3 p 

 Reduced maximum reading, 3o-47, 3rd, 5 a 

 Reduced minimum reading, 29.36,19111,3?. 



Mean semi-daily reduced 29. 9S 



Monthly range i-09 



Air Temiieraitire. 



In Degrees Fahr. 



Highest 82.5, 5th, 3 p 



Lowest 20,5, 2d, 6 A 



Mean hourly 42 6 



Mean of means of max. and min 43.3 



Mean sensible (wet bulb) 380 



Monthly range 620 



Highest mean daily 61.2,6th 



Lowest mean daily 32-9i ist 



Mean maximum 53-5 



Mean minimum 33-1 



Greatest daily range 42. o, Sth 



Least daily range 4-5, 22nd 



Humidity. 



Mean dew point 35,8 



Mean force of vapor 280 



Mean relative humidity 76.8 



Precipitaiioii. In inches. 



Total precipitation, in inches 1.99 



Number of days on which .01 inch or more 



rain fell 11 



Total snow in inches 25 



Days of sleighing None 



Wind. 



Total movement 6770m 



Greatest daily movement 39Sni, 9th 



Least daily movement 94"), 14th 



Mean daily movement 226m 



Mean hourly velocity 9.4m 



Maximum pressure per square foot, 17.5 lbs = 



59m per hour, 9th. 10 a., W. 

 Maximum velocity for 5 minutes, 33m per 



hour, Sth, 7A. 

 Prevailing direction, Southwest. 

 Summary. 



Northwest . . . • " 23 per cent 



West 16 " " 



Southwest 16 " " 



South 13 " " 



West Northwest 13 " " 



North Northeast 13 " " 



Other directions 6 " " 



Weather. 

 Mean cloudiness observed .... 50 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 166 hours = 42 per cent 



Number of clear days S 



Number of fair days 15 



Number of cloudy days 7 



Bright Sunshine. 

 Number hours recorded. 236 ^ 58 per cent. 

 Rain, 3rd, Sth, nth, 12th, 14th, 19th. 21st, 

 22nd, 23rd, 24th, 25th, 27th, 2Sth, 29tli 

 30th. 

 Thunder and Liehning. 19th, 30th. 

 Gales, 36m, 3rd, S.S.W.: 37m, 6th, S.: 39m, 

 7th,S.S.W.; 45m, Sth, N.W.; 59m, 

 9th, W\: 37m, nth, N.N.E.: 42m, J3th 

 W. N.W.: 37m. I^th W.N.W.: 40m, 

 17th. WN.W.; 45m, 19th, N.W.; 41m, 

 24th, W.; 43m, 25th, W.; 37m, 29th, 



Siio> 



W.S.W. 



nth, 12th, 22nd, 23rd, 28th. 



