AMHBMZTb MAfSi 



BULLETIN No. 45 1. 



JULY 1926 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTUIIAL EXPERIMENT 



STATION. 



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



ff^ij^/i/ of barometer above ground, 31 ft. Above sea level, zyj.^ ft. 

 Height oj Wind Instruments 72 ft. 2'ime used, y^thMer. 



MONTHLY SUMMARY. 



Pressure. In inches. 



Maximum reduced to freezing, 30.04, 26th, 8 A. 

 Minimum reduced to freezing, 29.21, loth, 6 p. 

 Reduced maximum reading, 30.33, 26th, 8 A. 

 Reduced minimum reading, 29.50,10th, 6 p. 



Mean semi-daily reduced 29.961 



Monthly range 0.83 



Air Temperature. In Degrees Fahr. 



Highest 100.0, 22d, 3 p 



Lowest 47.0,5th, 5.30 A 



Mean hourly 69.3 



Mean of means of max. and min 70.3 



Mean sensible (wet bulb) 62.8 



Monthly range 53.0 



Highest mean daily 82.7, 21st 



Lowest mean daily 59.6, 29th 



-Mean maximum 83.8 



Mean minimum 56.S 



Mean daily range 27 o 



Greatest daily range 39.5, 8th, 27th 



Least daily range 11.0,29th 



Uamidiiy. 



Mean dew point 59.2 



Mean force of vapor 715 



Mean relative humidity 74.1 



Precipitation. In inches. 



Total precipitation, in inches 3.24 



Number of days on which .01 inch or more 

 rain fell 9 



Wind. 



Total movement 2964m 



Greatest daily movement 201m, nth 



Least daily movement .... 38m, 1st, 2gth 



Mean daily movement 96m 



Mean hourly velocity 4.0m 



Maximum pressure per square foot, 15.0 lbs = 



55m per hour, 22d, 5 p., N.W. 

 Maximum velocity for 5 minutes, 30m per 



hour, 22d, 5 p., N.W. 

 Prevailing direction. South Southwest. 



Summary. 



North Northeast 16 per cent. 



South 16 " " 



South Southwest i6 " " 



Southwest 16 " " 



Northeast 10 " " 



Other directions 26 " " 



Weather. 



Mean cloudiness observed .... 52 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 160 hours = 35 per cent 



Number of clear days 10 



Number of fair days 17 



Number of cloudy days 4 



Briiiht Sunshine. 



Number hours recorded. 302 = 65 per cent. 

 Kain. 6th, loth, 13th, J4th, 15th, 16th, 

 i8th, 22d, 24th. 29th. 



Thunder and LiiihtninA. loth, 13th, l8th^ 



22d, 24th, 29th. 



Gales. 51m. loth, N.W.: 55m. 22d, N. W. 



