BULLETIN No. 403. 



JULY, 1922 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGIIICULTUIUL EXrEUIMENT 



STATION. 



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



Height of ha ro meter above ground, 31 fi. Above sea level, 2yj.3 ft. 

 Height oj Wind Instruments 72 ft. Time used, y^th Mer. 



MONTHLY SUMMARY. 



'ressuie. 



In inches. 



Maxinuini reduced to freezing, 29.94, 26th, 8 A 

 Minimum reduced to freezing, 29.38 23rd, 8 p 

 Reduced maximum reading 30.23 26th, 8 .a. 

 Reduced minimum reading, 29.67, 23rd, S p 



Mean semi-daily reduced 30 016 



Monthly range 056 



Air Temperalure. 



In Degrees Fahr. 



Highest 94.0, 12th, 4 p 



Lowest 49.0,30th, SoO A 



Mean hourly 69.4 



Mean of means of max. and min 70.S 



Mean sensible (wet bulb) 64.5 



Monthly range 45.0 



Highest mean daily 76.2, 2nd, 18th 



Lowest mean daily 62.7, 5th 



Mean maximum 81.9 



Mean minimum 59-8 



Mean daily range 22.1 



Greatest daily range 33.0,30th 



Least daily range 9 3 5th 



Hiimidity. 



Mean dew point 62.3 



Mean force of vapor 709 



Mean relative humidity So. 6 



Precipitation. In inches. 



Total precipitation, in inches 4.2S 



Number of days on which .01 inch or more 

 rain fell 12 



•Temperature in ground shelter. 

 ••Reduced to freezing and sea-level. 



Wind. 



Total movement 2S47 ffi 



Greatest daily movement i6Sm, 17th 



Least daily movement .... 35m, 4th, 15th 



Mean daily movement 92m 



Mean hourly velocity 3.8ni 



Maximum pressure per square foot, 16.0 lbs = 



57m per hour, 8th, 4 P, S.S.W. 

 Maximum velocity for 5 minutes, 30 m per 



hour,Sth,4 p., S.S.W. 

 Prevailing direction. South Southwest. 



Summary. 



South Southwest 26 per cent 



South 23 " " 



Southwest 13 " " 



North 10 " " 



Other directions 28 " " 



Weather. 



Mean cloudiness observed .... 49 per cent 

 Total cloudiness recorded by the .Sun 



Thermometer . . 154 hours = 33 per cent. 



Number of clear days 12 



Number of fair days 12 



Number of cloudy days 7 



Bright Sunshine. 



Number hours recorded, 308, = 67 per cent. 



Rain, ist, 3d, 4th, jlh, 8th, 13th, 18th, 19th, 

 23d, 24th 27th, 2Sth. 



Thunder and Liiihtnin^. 3d. ^th, 13th. 18th 



23rd, 28th, 31st. 

 Hail, trace on 2Sth. 

 Gales, ;7m, Sth, S.S.W. 



