BULLETIN No. 349. 



JANUARY, 19 18 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGKICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 51 ft. Above sea level, 2yj.^ ft. 

 Height oj Wind Instruments 72 ft. 



MONTHLY SUMMARY. 



Pressme. In inches. 

 Maximum reduced to freezing, 30.20, 2Sth, 6 .\ 

 Minimum reduced to freezing, 28.52, 15th, i p 

 Reduced maximum reading . . 30.54, 2Sth, 6.\ 

 Reducedt minimum reading, . 28.84, 15th, i v 



Mean semi-daily reduced 29.875 



Monthly range 1.7° 



*Air Temperature. In Degrees Fahr. 



Highest 44.0, i2th, 2:30 P 



Lowest -20.0, 2nd, 7:30 A 



Mean hourly i3-3 



Mean of means of max. and min 13.9 



Mean sensible (wet bulb) 10.9 



Monthly range 64.0 



Highest mean daily 33-7, '2th 



Lowest mean daily -6.4, 2nd 



Mean maximum 2?.9 



Mean minimum 4.9 



Mean daily range 18.0 



Greatest daily range 33.0, 31st 



Least daily range 6.0, 13th 



Humidity. 



Mean dew point 5.9 



Mean force of vapor 0S4 



Mean relative humidity 77.1 



Precipitation. In inches. 



Total precipitation, in inches 4. 11 



Total snow, in inches 185 



Number of days on which .01 inch or mtjre 



rain fell 11, 



Days of sleighing, ... 31 



• Temperature in ground shelter. 

 •♦Reduced to freezing and sea-level. 



Wind. 



Total movement 5491 ni 



Greatest daily movement 391m, 4th 



Least daily movement iim, iSth 



Mean daily movement 177 m 



Mean hourly velocity 7-4 ni 



Maximum pressure per square foot, 8. 5 lbs = 



41m per hour, nth, 2 a, N.W. 

 Maximum velocity for 5 minutes, 32m per 



hour, nth, 2 A, N.W. 

 Prevailing direction, West Northwest. 



Summary. 



North 16 per cent 



North Northwest 13 " " 



Northwest 22 " " 



West Northwest 10 " " 



West Southwest 16 " " 



West 10 " " 



Other directions 13 " " 



Weather. 



Mean cloudiness observed .... 44 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 121 hours = 41 percent 



Number of clear days 9 



Number of fair days 14 



Number of cloudy days S 



Brii^ht Sunshine. 



Number hours recorded, 173 hrs, = 59 per cent. 



Rain, 7th, 12th. 



Snow. 7th, 8th, loth, nth. 12th, 15th, i7th^ 

 i8th, 19th, 22d, 24th, 25th, 28th, 29th 



Hail, 7th, 28th. 



Gales, 40m 3d, N; 36m 5th, N.W.: 36m lOth- 

 N.W.; 41m nth, N.W.; 3gm i2th^ 

 W.S.W.; 36m 15th, N.W.; 4oni 20th,' 

 W.N.W.: 35m 23d, W.X.W. 



