LIHhAKY Oh IHL 



MassscLoselts Agricaltural Callege, 



AMHERST. MASS. 



BULLETIN No. 442. 



OCTOBER 1925 



Meteorolooical Observations 



AT THE 



MASSACHUSETTS 



AGllICULTURAL EXrEllIMENT 



STATION. 



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



Hei«;ht of barometer above ground, 51 ft. Above sea level, 2jj.^ ft. 

 Height oj Wi7ui Instruments J 2 ft. Time used, 7 ^th Mer. 



MONTHLY SUMMARY. 



Pressnie. In inches. 



Maxiniuni reduced to freezing, 30.22, 30th, 9 a. 

 Mininuun reduced to treezinfj. 2S.S0, 2i5th, 3P. 

 Reduced maximum reading, 30.53, 30th, 9 A. 

 Reduced minimum reading, 29.10, 25th, 3 p. 



Mean semi-daily reduced 29.975 



Montlily range 1-43 



Air Teinperadire- In Degrees Fahr. 



Highest 73-0, 17th. 030 P 



Lowest 20.5, 31st, 7 A. 



Mean ht)urly 43.2 



Mean of means of max. and mi n 43.5 



Mean sensible (wet bulb) 39-8 



Monthly range 53-5 



Highest mean daily 56-5. i7th 



Lowest mean daily 29.7,30th 



Mean maximum 53-6 



Mean minimum 33-4 



Mean daily range 20 



Greatest daily range 3"-5. ist 



Least daily range 6.5- Qt^'^ 



Hi 



idi<y. 



Mean dew point 36 



Mean force of vapor 285 



Mean relative humidity 80.0 



Precipitalion. In inches. 



Total precipitation, in inches 4 74 



Total snow, in inches, trace 



Number of days on which .01 inch or more 

 rain fell 14 



>Viii.l. 



Total movement 4231m 



Greatest daily movement 426m, 26th 



Least daily movement .... 39m, 9th, 30th 



Mean daily movement 136 m 



Mean hourly velocity 5.7ni 



Ma.ximuni pressure per square foot, 22.0 lbs = 



66in per hour, 25th, 10 p., W. 

 .Maximum velocity for 5 minutes, 42m per 



hour, 25th, 10 P., W. 

 Prevailing direction. West Southwest. 

 Summary. 



Southwest, 19 per cent 



South 16 " " 



Northwest 13 " " 



West 13 " " 



South Southeast 10 " " 



Other directions 29 " " 



Wea<lier. 



Mean cloudiness observed .... 53 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 213 hours = 62 per cent 



Number of clear days 5 



Number of fair days 11 



Number of cloudy days 15 



liriiiht SiiiiNhiiie. 



Number hours recorded, 128 = 38 per cent. 

 Kain. 2d, 3d, 5th, 9th. lOth, 14th. 15th, 16th, 



17th, 19th, 23rd, 24th, 25th, 28th, 2gth, 



30th. 

 Snow. loth, 30th. 

 Frosts, 6th, 14th, 22d, 24th, 27th, 28th, 30th, 



31st. 

 Gales. 53ni, loth, N. W.; 47ni, 17th, N. W.; 



36m, 20th, N. W.; 66m, 25th, W.: 



55m, 26th, N. W.: 37m. 29th, N. W. 



