BULLETIN No. 358. 



OCTOBER, 1918 



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. Aboite sea level, 2"/ 3.^ ft. 

 Height oj Wind Itistrumefits y2 ft. Time used, y^th Mer. 



MONTHLY SUMMARY. 



PresBute. In inches. 

 Maximum reduced to freezing, 30.26, 19th, 8 A 

 Minimum reduced to freezing, 29.27, 13th, 4 p 

 Reduced maximum reading . . 30.57, 19th, 8 A 

 Reduced! minimum reading, . 29.56, 13th, 4 p 



Mean semi-daily reduced 30.118 



Monthly range i.oi 



*Air Temperature. In Degrees Fahr. 



Highest 78.5, 29th, 2 p. 



Lowest 27.5, 23d, 7:30A 



Mean hourly 52.6 



Mean of means of max. and min 53.1 



Mean sensible (wet bulb) 47.8 



Monthly range 51 o 



Highest mean daily 67.2, 29th 



Lowest mean daily 42.4, 19th 



Mean maximum 65.2 



Mean minimum 41.0 



Mean daily range 24.2 



Greatest daily range 41.5,10th 



Least daily range 8.5, 30th 



Hnmidity. 



Mean dew point 44.3 



Mean force of vapor 389 



Mean relative humidity So. 5 



Precipitation. In inches. 



Total precipitation, in inches 1.32 



Number of days on which .01 inch or more 



rain fell 10 



•Temperature in ground shelter. 

 "Reduced to freezing and sea-level. 



Wind. 



Total movement 4297 m 



Greatest daily movement 312m, 31st 



Least daily movement 21m, 23d 



Mean daily movement 139 m 



Mean hourly velocity 5.8 m 



Maximum pressure per square foot, 10.5 lbs = 



46m per hour, 20th, 4 p, S. 

 Maximum velocity for 5 minutes, 30m per 



hour, 6th, 2 p, W.S.W. 

 Prevailing direction. South Southwest. 



Summary. 



South 32 per cent. 



South Southwest 32 " '' 



Other directions 36 " " 



Weather. 



Mean cloudiness observed .... 52 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 161 hours = 47 per cent 



Number of clear days 8 



Number of fair days 11 



Number of cloudy days 12 



Bright Snnshine. 



Number hours recorded, 180 hrs, = 53 per cent 

 Rain. 2d, 3d, 5th, 6th, 12th, 20th, 26th, 2Sth, 



30th, 31st. 

 Thnnder and Li^htnin^. 3d. 

 Frosts, 4th, 8th, 9th, loth, 15th, 19th, 22d, 23d, 



24th.. 

 Gales, 35 miles or more per hour : 42 m, 



6th, W.S.W.; 46 m, 20th, S 



