BULLETIN No. 383. 



NOVEMBER. I 920 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



ffeight of ha ro meter above ground, 51 ft. Above sea level, 2J^.§ ft. 

 Height oj Wind Instrutnents 72 ft. Time used, fjth Mer. 



MONTHLY SUMMARY. 



Pressuie. In inches. 

 Maximum reduced to freezing, 30.30, 29th, 9 a 

 Minimum reduced to freezing, 29.04,17th, 3P 

 Reduced ma.ximum reading . 30.62, 29ih, 9 a 

 Reduced minimum reading, 2935, 17th, 3P 



Mean semi-daily reduced 30.129 



Monthly range 1.27 



*Air Temperature. In Degrees Fahr. 



Highest 62.0, 2d, II P 



Lowest 16.0, 13th, 7 A 



Mean hourly 369 



Mean of means of max. and min 36.9 



Mean sensible (wet bulb) 32.1 



Monthly range 46.0 



Highest mean daily 49 9. ist 



Lowest mean daily 26.9, 21st 



Mean maximum 44-5 



Mean minimum 29.3 



Mean daily range 15.2 



Greatest daily range 31.5, 2d 



Least daily range 5.0, 25th, 2Sth 



Humidity. 



Mean dew point 26.9 



Mean force of vapor 211 



Mean relative humidity .' ..^Jl 73-9 



Precipitation. In inches. 



Total precipitation, in inches 4 67 



Total snow, in inches 5j 



Number of days on which .01 inch or more 

 rain fell 



Wind. 



Total movement 4268 m 



Greatest daily movement .338m, 3d 



Least daily movement 27m 7th 



Mean daily movement 142m 



Mean hourly velocity 5-9 rn 



Maximum pressure per square foot, 6.5 lbs = 



36m per hour, 17th, gp, W.N.W. 

 Maximum velocity for 5 minutes, 33m per 



hour, 17th, 9P, W.N.W. 

 Prevailing direction. Northwest. 



Summary. 



North Northeast 23 per cent 



West Northwest 13 ' 



South Southwest ........ 13 • 



Northwest 10 ' 



West Southwest 10 " 



Other directions -;i 



Weather. 



Mean cloudiness observed .... 65 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 207 hours = 70 per cent. 



Number of clear days 2 



Number of fair days 8 



Number of cloudy days 20 



Briiiht Sunshine. 



Number hours recorded, 86 hrs, ^ 30 per cent. 

 Rain, ist, 2d, 7th. 9th, i6th, 17th, 21st, 

 23d, 24th, 25th. 27th. 



Snow, 12th, 16th, 2ist, 24th, 25th. 27th. 



Hail, i6th. 



Frost, before the i6th : 4th, 9th, iitli, 12th 



13th, 14th. 

 '^'Gales, 36m- 17th, W.N.W.; 35m, 23d, N. E 



•Temperature in ground shelter. 

 ••Reduced to freezing and sea-level 



