METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTORAL COLLEGE. 



.A.3vri3:E:R,ST. 



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



Height of barometer above ground, 51 f^- Above sea level, 2jj.^ ft. 

 Height of Wind Instruments 72 ft. 



BULLETIN No. 2 14. 



OCTOBER, 1906. 



MONTHLY SUMMARY. 



freaxure. In inches. 



Maxuniini reduced to freezing, 30.32, 13th, S A.; 

 Minimum reducedto freezing, . 2S.93, 6th, 7 p. 

 Reducedf maximum reading, 30.63, 13th, 8 A.; 

 Keducedt minimum reading, . 29.22, 6th, 7 p. 



Mean semi-daily reduced, 3o-o94 



Monthly range 1.41 



*Air Temperature. In Degrees Fahr. 



Highest 77.5,5th, 3:00 P. 



Lowest 24.0, 13th, 7:00 A. 



Mean hourly, 5o-5 



Mean of means of max. and min 51.4 



Mean sensible (wet bulb), 45-7 



Monthly range, 53-5 



Highest mean daily, 63.1,5th 



Lowest mean daily, 38-8, 13th 



Mean maximum 62.4 



Mean minimum, 40-4 



Mean daily range 22.0 



Greatest daily range, 41.0,14th, 15th 



Least daily range, 5.5,21st 



Untnidlty. 



Mean dew point, 42.9 



Mean force of vapor, 347 



Mean relative humidity, 84. i 



Preclpitntion. In inches. 



Total precipitation, 5.69' 



Number of days on which .01 inch or more 

 rain or melted snow fell, 6 



* Temperature in ground shelter, 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, . . '. 4398 m. 



Greatest daily movement, .... 357 m., 2Sth 



Least daily movement, 33 m., 13th, 



Mean daily movement, 142 m. 



Mean hourly velocity, 5 9ni. 



Maximum pressure per square foot, 9.0 lbs. = 

 42 m. per hour, gth,3 p., S. 



Maximum velocity for 5 minutes, 42 m. per 

 hour gth, 4 P., S. 



Prevailing Direction, West, Southwest. 



Summary. 



West, 13 per cent. 



North Northwest, 13 " " 



Southwest, 10 " " 



Southeast, 10 " " 



Other directions, 54 " " 



WentJier. 



Mean cloudiness observed, .... 52 per cent. 



Total cloudiness recorded by the Sun Ther- 

 mometer, . . . i52hrs.=45 per cent. 



Number of clear days 10 



Number of fair days, 11 



Number of cloudy days, 10 



Bright Sunshine. 



Number of hours recorded, . . 189 hrs. = 551< 

 Jtaln, 6th, 9th, loth. nth, 20th, 24th, 25th, 



30th, 31st. 

 Thunder and l,ightning, oth. 

 Gales, 35 miles or more per hour, 42 m. gth, 



S.; 35 m.; 30th., N. W, 

 Frosts, ist, 8th, nth, 12th, 13th, 14th, 15th. 



