METEOROLOGICAL OBSERVATORY 



Hatch Experiment Station 



MASSACHOSETTS AGRICULTURAL COLLEGE, 



Latitude, 42° 23' 48. 5" N. Longitude 72° 31' 10" \V. 



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

 Height of Wind Instruments 72 ft. 



BULLETIN No. 170. 



FEBRUARY, 1903. 



MONTHLY SUMMARY: 



Pressure. In inches. 

 Maxummi reduced to freezing, 30.15, 20th, 11 p. 

 Minimum reduced to freezing, 2S.61, 17th, 3 A. 

 Reducedt maximum reading, 30.48, 2otli, 11 p. 

 Reduced^ minimum reading, 2S.93, 17th, 3 a- 



Mean tri-daily reduced . 29.980 



Montiily range • 1.55 



*Air Teinperatiire. In Degrees Fahr. 



Highest, 57-0, 28th, 6 p. 



Lowest — ii.o, 2ist, 8 a. 



Mean hourly, 27.3 



Mean of means of max. and min., .... 27.2 



Mean sensible (wet bulb), 25.7 



Montiily range, (>S.o 



Highest mean daily 47.5, 28th 



Lowest mean daily, 3.3, 18th 



Mean maximum, '. . 36.0 



Mean minimum, 18.4 



Mean daily range, 17.6 



Greatest daily range, 45.0,21st 



Least daily range, 5-°i 2d 



Iliitniditij. 



.Mean dew point, 21.0 



Mean force of vapor 169 



Mean relative humidity, .... ... •77.7 



Precipitation. In inches. 



Total precipitation, 4-27 



Number of days on which .01 inch or more 



rain or melted snow fell, 9 



Snow, total in inches, 12-0 



Snow on ground at end of montii, . . ■ Trace 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 4529m. 



Greatest daily movement, .... 359m., 9th. 



Least daily movement, 7m., 2d. 



Mean daily movement, 162 m. 



Mean hourly velocity, 6.7 m. 



Ma.xinium pressure per square foot, 22.0 lbs.= 



66 m. per hour, 12th, 12 M., W. 

 Prevailing Direction, West. 



Summary. 



West, 29 per cent. 



Northwest, 11 " " 



West, Northwest, . . 11 " " 



Southwest, II " " 



.Southeast, 11 " " 



Other directions, 27 " 



Weather. 



Mean cloudiness observed, .... 53 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 151 hrs.=5i per cent. 



Number of clear days, 11 



Number of fair days, 6 



Number of cloudy days, 11 



liriyht Sunshine. 



Number of hours recorded, . . . 145 hrs. = 49* 

 Rain, 2d, 4th, 8th, nth, 12th, 27th, 28th. 

 *'»»o»<',ist. 5th, 7th, 8th, 15th. 16th, 17th, i8th 

 Oaten, 35 miles or more per hour, 46m. 5tli, 



W.N.W.i35ni. 6th W.N.W.; 56m. 9th, S. 



W.; 66 m. 12th, \V.; 36ni. 17th, N.N.W.; 



36ni. iSth, S.S.W.: 35111. 19th, W.: 58111. 



isth,s.s.\v. 



Number of days sleigiiing, iS 



