BULLETIN No. 373. 



JANUARY, 1920 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTUIUL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 51 ft. Above sea level, 213.5 ft. 

 Height oj Witid Instruments 12 ft. Time used, l^thMer. 



MONTHLY SUMMARY. 



Pressnie. In inches. 

 Maximum reduced to freezing, 30.64, 31st, 9 A 

 Minimum reduced to freezing, 29.09, 17th, i p 

 Reduced maximum reading . 30.99, 31st, 12 p 

 Reduced minimum reading, 29.41, 17th, i p 



Mean semi-daily reduced 30.174 



Monthly range 1.58 



♦Air Temperature. In Degrees Fahr. 



Highest 4- 10, 27th, 4 p 



Lowest -16.5, 20th, 8 A 



Mean hourly 16.0 



Mean of means of max. and min 15.2 



Mean sensible (wet bulb) 13.6 



Monthly range 57. 5 



Highest mean daily 35-9. 8th 



Lowest mean daily -4.7, 31st 



Mean maximum 24.9 



Mean minimum 5-5 



Mean daily range 19-4 



Greatest daily range 30.0, 20th, 27tli 



Least daily range 7.5, 8th 



Humidity. 



Mean dew point 11.4 



Mean force of vapor 095 



Mean relative humidity 87.7 



Precipitation. In inches. 



Total precipitation, in inches 2.74 



Total snow, in inches 23.', 



Number of days on which .01 inch or more 



rain fell 13' 



Days of sleighing, 23. 



•Temperature in ground shelter. 

 ••Reduced to freezing and sea-level. 



Wind. 



Total movement 4734 m 



Greatest daily movement 357in, 14th 



Least daily movement 4ini, 27111 



Mean daily movement i53m 



Mean hourly velocity 6.4 m 



Maximum pressure per square foot, 9.5 lbs = 



43m per hour, i8th, 12M, N.W. 

 Maximum velocity for 5 minutes, 30m per 



hour, 25th, 9A, N. 

 Prevailing direction. Northwest. 



Summary. 



North Northwest 26 per cent 



North 16 " " 



Nortliwest 13 " " 



West Northwest 13 '' " 



-South Southwest 10 " " 



Other directions 22 " " 



Weather. 



Mean cloudiness observed .... 49 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 80 hours = 27 per cent. 



Number of clear days 12 



Number of fair days 15 



Number of cloudy days 4 



Bright Sunshine. 



Number hours recorded, 214 lirs,= 73 per cent 



Rain. ist. 8th, gth, 23rd. 



Snow. 8th, 9th, 13th, 14th, i6tli, 17th, 19th, 



20th, 23rd, 2*th, 25th, 27tl), 2Sth, 

 Hail, 7th, 

 Gales, 35m 12th, W.; 36111, 14th, W. N. W.: 



35m, 17th, N.W.; 43m, i8th. N.W. 



