BULLETIN No. 278. 



FEBRUARY, 1912 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 51 ft. Above sea levels ^73-5 ft- 

 Height of Wind Instnmients 72 ft. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maxinuini leduced to freezing, 30 13, 14th, 7 A. 

 Mini mil 111 reduced to freezing. 28.41, 22d, 6 a. 

 Kediicedt iiia.vinuini leading, 30.47, 14th. 7 a. 

 Keducedf ininiimiin reading, 28. 72, 22d, 6 A. 



Mean semi-daily reduced. 29.931 



Monthly range, ... 1.75 



•Air Temperature. In Degrees Falir. 



Highest, 49-5. 24th, 4 p. : 25th, 2 P. 



Lowest, —16.5, nth, 6 A. 



Mean iiourly, 20.7 



Mean of means of max. and min 21.4 



Mean sensible (wet bulb), 17.1 



Monthly range 66.0 



Highest mean daily, 39-9. 25th 



Lowest mean daily, —3-8, loth 



Mean maximum, 32-° 



Mean miniuium .... 10.9 



Mean daily range, 21.1 



Greatest daily range 38.0, 15th 



Least daily range, . 9.0,26th 



Humidity. 



Mean dew point, 12.6 



Mean force of vapor, 116 



Mean relative humidity 784 



Precipitation. In inches. 



Total precipitation, 3- 16 



Number of days on which .01 inch or more 



rain fell ■ • • " 5 



Total snow in inches 2.5 



Wind. 



Total movement 4798m. 



Greatest daily movement, .... 578m., 22d 



Least daily Jiiovement, 3111., 17th 



Mean daily movement, 165.4 "i 



Mean hourly velocity, 6.9 m 



Maximum pressure per square foot, 23.0 lbs. = 



68ni. per hour, 22d, 9 A., W. S. W. 

 Maximum velocity for 5 minutes, 52 m. per 



hour, 22d, 10 A., W. S. W. 

 Prevailing Direction, Northwest. 



Summary. 



North 31 percent. 



West Northwest 14 " " 



Northwest 24 " " 



South Southwest " " 



South " " 



North Northeast " " 



Other directions 31 " " 



Weather. 



Mean cloudiness observed, .... 36 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, i28hrs.=42 per cent. 



Number of clear days, 11 



Number of fair days, 9 



Number of cloudy days, 9 



Bright Sunshine. 



Number of hours recorded, . . 180 hrs. = 58* 



Kain, 20th, 21st, 26th. 



Snow, 6th, Sth, 21st, 22d, 26th. 



Hail, 2ist. 



Thunder and Lightning, 22d. 



Days Sleighing, 23. 



Galefi, 35 or more miles per hour : 36 m, 4th, 



N.VV.; 68 m, 22d, W. S. W.; 38 m, 23d, W. 



N. W. 3S m, 27th, N. W.; 3Sm, 29th, N.W. 



* remperature in ground shelter. 

 t Keduced to freezing and sea-level. 



