BULLETIN No. 350. 



FEBRUARY, 19 18 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGIIICULTUIUL EXPERIMENT 



STATION. 



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



Height of barometer above ground, ^i ft. Above sea level, 2yj.^ ft. 

 Height oj Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 30.37, 21st, 12 p 

 Minimum reduced to freezing, 28.58, 26th, 6 a 

 Reduced maximum reading . . 30.70, 21st, 12 p 

 Reducedt minimum reading, . 2S.SS, 26th, 6 a 



Mean semi-daily reduced 30-o63 



Montlily range 1.82 



*Air Temperature. In Degrees Fahr. 



Highest 51.0, 25th, 3 p 



Lowest -22.5, 2nd, 6 A 



Mean hourly 20.5 



Mean of means of max. and niin 19.6 



Mean sensible (wet bulb) iS.o 



Monthly range 73.3 



Highest mean daily 42.3, 25th 



Lowest mean daily . -9.1, 5th 



Mean maximum 31.4 



Mean minimum 7,7 



Mean daily range 23.7 



Greatest daily range 43.5, 2d 



Least daily range 4.5,28th 



Humidify. 



Mean dew pfiint 12.S 



Mean force of vapor 126 



Mean relative humidity 76.0 



Precipitation. In inches. 



Total precipitation, in inches 2 99 



Total snow, in inches 11 



Number of days on which .01 incli or more 



rain fell 11 



Days of sleighing, ... 28 



'Temperature in ground shelter. 

 *• Reduced to freezing and sea-level. 



Wind. 



Total movement 5632 m 



Greatest daily movement 483m, 26th 



Least daily movement 25m, 3d 



Mean daily movement 201 m 



Mean hourly velocity 8.4 ni 



Maximum pressure per square foot, 20.0 lbs = 



63m per hour, 26th, 3 p, W.N.W. 

 Maximum velocity for 5 minutes, 45m per 



hour, 26th, , I p, W.N.W. 

 Prevailing direction. West. 



Summary. 



South Southwest 25 per cent 



West Northwest 14 " 



North Northwest 14 " 



Northwest u " 



West II " 



Southwest II " 



Other directions 14 " 



Weather. 



Mean cloudiness observed .... 45 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 142 hours = 48 per cent 



Number of clear days 9 



Number of fair days 9 



Number of cloudy days 10 



Bright Sunshine. 



Number hours recorded, 154 Ins, = 52 per cent 



Rain, 15th, 19th, 25th, 26th, 28th. 



Snow, 3d, 6th, 9th, loth, 17th, 22d, 2Sth. 



Hail, 9th, 28th. 



Gales, S7m, 4th, W.NW.; 46m jth, W.N.W.: 



42m, 14th, S.S.W.: r39m, 15th, N.W.; 



39m, 19th, S.W.: 57m, 20th, N.W.; 



44m, 2ist, S.S.W.: 53m, 25th, S.W.: 



63m. 26th. W.N.W. 



