BULLETIN No. 397. 



JANUARY, (922 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGIMCULTUKAL EXPEUIMENT 



STATION. 



Latitude, 42° 23' 48.5" N. Longitude 72" 31' lo" \V. 



Flt'i^^ht of Ihinvneter above ground, ^t ft. Above sea level, 2yj.^ ft. 

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



MONTHLY SUMMARY. 



Pressiiie. In inches. 

 Maximum reduced to freezing, jo.36, 25th, 10 A 

 Minimum reduced to freezing, 2S.00, nth, 12 p 

 Reduced maximum reading 30.70, 25th, 10 a 

 Reduced minimum reading, 28.92, iith, 12 p 



Mean semi-daily reduced 30.177 



Monthly range 1.7S 



Air Temperature. In Degrees Fahr. 



Highest 41.0, 15th, 2:30 P: 30th, 3 P 



Lowest . . 12.0, 24th, g a: 25th, 9 a: 26th, 8:30 a 



Mean hourly 19 



Mean of means of max. and min 20.1 



Mean sensible (wet bulb) 16.4 



Monthly range 53.0 



Highest mean daily 35.7. 19th 



Lowest mean daily 2.2, 25th 



Mean maximum 30.7 



Mean minimum 9.6 



Mean daily range 21. i 



Greatest daily range 36.0 26' h 



Least daily range 8.5, nth 



Humidify. 



Mean dew point n.5 



Mean force of vapor 113 



Mean relative humidity 78.5 



Precipitation. In inches. 



Total precipitation, in inches 1.56 



Number of days on which .01 inch or more 



rain fell 6 



Total Snow in inches 14^ 



Days of sleighing 3[ 



•Temperature in ground shelter. 

 "Reduced to freezing and sea-level. 



Wind. 



Total movement 5353 tn 



Greatest daily movement 403m, 29th 



Least daily movement 12m, 17th 



Mean daily movement 173m 



.Mean hourly velocity 7.2m 



Maximum pressure per square foot, 30 lbs = 



78m per hour, 22d, 12 m, W. 

 Maximum velocity for 5 minutes, 12 m per 



hour, 22d, 12 M, W. 

 Prevailing direction^ Northwest. 

 Summary. 



Northwest 23 per cent 



North 19 " " 



Northea.st - . . 13 " " 



West Northwest 13 " " 



Southwest 10 " " 



Other directions 22 " " 



Weather. 



Mean cloudiness observed .... 38 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . i04 hours = 36 per cent. 



Numter of clear days 16 



Number of fair days 8 



Number of cloudy days 7 



Brifiht Sunshine. 



Number hours recorded, 190, = 64 per cent. 

 Kain, 4th, 5th. 



Snow, 3d. 8th, 9th, nth, 14th, iSth 21st 

 tiales, 42m, 2d, N. W.; 36m, nth, N. ^6m., 



i2th, W.N. W.;7Sm., 22d,W.;38m.,29tli, 



N. N. E. 



