if 



BULLETIN No. 469. 



JANUARY, 1928 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGIIICULTUIUL EXPERIMENT 



STATION. 



■^w or rut 



Latitude, 42° 23' 48.5" N. 

 Height of ha ro meter above ground, ^r ft. Above sea Jei 



Height oj Wind Instruments 72 ft. Time used, y^th Mer 



Longitude y^^fiHl'^^'^/'' ^^^'Cllfdiuf Col 

 ^^M^^y^ MASS. 



MONTHLY SUMMARY. 



Pressiiie. In inches. 



Maximum reduced to freezing, 30.29, 16th, 9A. 

 Minimum reduced to freezing-, 28.60, 25th, 6a- 

 Reduced maximum reading, 30.61, 16th, g a. 

 Reduced minimum reading, 28.90,25th, 6 a. 



Mean semi-daily reduced 29.960 



Monthly range 1.71 



Air Temperature. 



In Degrees Fahr. 



Highest 54.5, 7th, 2-30 p 



Lowest -3.5, 30th, 7 A 



Mean hourly 27.; 



Mean of means of max. and niin 27. 



Mean sensible (wet bulb) . i 24.4 



Monthly range 38.0 



Highest mean daily 44.4, 7th 



Lowest mean daily 10.8, 30th 



Mean maximum 35.2 



Mean minimum 19.3 



Mean daily range 15.9 



Greate.st daily range 36,5, 25th 



Least daily range 5.0,12th 



Humidity. 



Mean dew point 20.1 



Mean force of vapor 157 



Mean relative humidity 78.9 



Precipitation. In inches. 



Total iM'ecipitation, in inches 2.19 



Numbe. of days on which .01 inch or more 



rain fell 11 



Total snow in inches \ 



Days of sleighing ' 5 



Wiii.l. 



Total movement 64i9ni 



Greatest daily movement S^f^m, 25th 



Least daily movement 28m, 31st 



Mean daily movement 207m 



Mean hourly velocity 8.6m 



Maximum pressure per square foot, 25.0 lbs = 



71m per hour, 25th, 5 r. W. 

 Maximum velocity for 5 minutes, 42m per 



hour, 25th, 6 p., \V. 

 Prevailing direction. West 

 Summary. 



West 32 per cent 



North Northwest 13 " " 



West Southwest 13 " " 



Southwest 13 " " 



Other directions 29 " " 



Weather. 



Mean cloudiness observed .... 54 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 165 hours = 56 per cent 



Number of clear days 4 



Number of fair days 14 



Number of cloudy days 13 



Bright Siiiisliiiie. 



Number hours recorded. 132 ~ 44 per cent. 

 Rain. ist. 9th, 13th, 14th, igtli, 24th, 25th, 26tli 

 Thunder and Lif^htening, 13th. 

 Snow, 10th, 16th, I9tli, 20th, 21st, 26th, 28th, 29th 



Gales, 40m, ist, W.; 39m, 2d. W.N. W.; 51m, 

 5th, N. W.; 50m, 14th W. 35m, 17th 

 N.W.: 4ini, 20th, N. W.; 44m, 21st; 

 W.; 7rni,25th,W.: 56m, 26th, W.N. 

 W.; 4.?m, 29th, N. 



