BULLETIN No. 477. 



SEPTEMBER, 1928 



Meteoroloo'ical Observations 



AT THE 



MASSACHUSETTS 



AGllICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, j'(5 //. Aboi'e sea level, 2^j.j ft. 

 Height 0/ Wind Instruments 6y ft. Time used, y^th Aler. 



MONTHLY SUMMARY. 



Pressnie. In inches. 



Maximum reduced to freezing, 30.10, 6th, gA. 

 Minimum reduced to freezing, 29.41, 23rd, 2P. 

 Reduced maximum reading, 30.38, 6th, 9 A. 

 Reduced minimum reading, 29.68, 23rd, 2P. 



Mean semi-daily reduced 30.058 



Monthly range 70 



Air Temperature. 



In Degrees Fahr. 



Highest 84.0, 13th, 2-30 p 



Lowest 31.0, 25th, 7 A., 29th, 6 A. 



Mean hourly 57.8 



Mean of means of max. and min 59.0 



Mean sensible (wet bulb) 53.7 



Monthly range 53.0 



Highest mean daily 68.4,11th 



Lowest mean daily 45.8, 27ih 



Mean maximum 68.7 



Mean minimum 48.8 



Greatest daily range 34. 0, 23rd 



Least daily range 5.0, t2th 



Humidity. 



Mean dew point 51.7 



Mean force of vapor 470 



Mean relative humidity 85.2 



Precipitation. In inches. 



Total precipitation, in inches 3-o7 



Number of days on which .01 inch or more 

 rain fell 9 



per cent 



Wind. 



Total movement 3744ni 



Greatest daily movement 2S2ni, 20th 



Least daily movement 40m, 8th 



Mean daily movement 125 m 



Mean hourly velocity 5.2m 



Ma.ximum pressure per square foot, 5.5 lbs = 



33m per hour, 20th, iip. 

 Maximum velocity for 5 minutes, 28m per 



hour, 26th, 9 A. 



Prevailing direction. South Southwest 

 Summary. 



Southeast 



Northwest 



South 



Southwest 10 



South Southeast 10 



North 10 



Other directions 25 



Weather. 



Mean cloudiness observed .... 52 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 203 hours = 52 per cent 



Number of clear days 2 



Number of fair days 15 



Number of cloudy days 13 



16 

 16 

 13 



Briiiht Sunshine. 



Number hours recorded, 1 70= 48 per cent. 



Rain. 3rd, 4th, 7th, 13th, 17th, i8th, 19th, 20th, 



23rd, 25th, 26th, 27th, 2Sth. 



Thunder and Li^htnin^, 13th, I7tli. 

 Galefs, none. 



