BULLETIN No. 412. 



APRIL. 1923 



Meteorolooical Observations 



AT THK 



MASSACHUSETTS 



AGIIICULTUIIAL EIPEllIMENT 



STATION. 



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



ffei^hf of barometer above ground, jr ft. Above sea level, 2yj.^ ft. 

 Height oj Wimi Instruments y 2 ft. Time used, y^thMer. 



MONTHLY SUMMARY. 



Pressiiie. In inches. 



Maximum reduced to freezing, 30.29, 2d, ia 

 Minimum reduced to freezing, 29.04, 30th. 4A 

 Reduced maximum reading 30.61 ^ 2d, lA 

 Reduced minimum reading, 29.34, 30th, 4A 



Mean semi-daily reduced 29.956 



Monthly range 1.27 



Air TemperaUire. In Degrees Fahr. 



Highest S60, 2ist, 41' 



Lowest S.5, 1st, 6.A 



Mean hourly 45.4 



Mean of means of max. and min 45.9 



M.ean sensible (wet bulb) 39.4 



Monthly range 775 



Highest mean daily 72.3,21st 



Lowest mean daily 1S.7, ist 



Mean maximum 58. 2 



Mean minimum 33.6 



Mean daily range 24.1 



Greatest daily range 44.0, 20th, 27th 



Least daily range 7.0, 5th 



Humidity. 



Mean dew point 32.4 



Mean force of vapor 314 



Mean relative humidity 65 3 



Precipitation. In inches. 



Total precipitation, in inches 3.19 



Total snow, in inches Trace 



Number of days on which .01 inch or more 



rain fell 10 



Frosts after the 15th, iSth 



•Temperature in ground shelter. 



••Reduced to freezingand sea-level. 



Wind. 



iotal movement 6o93'm 



Greatest daily movement 353ni, 24th 



Least daily movement 88m, loth 



Mean daily movement 203m 



.Mean hourly velocity 8.5m 



.Maximum pressure per square foot, 22.5 Ibs = 



67m per hour, 29th, lA., S.S.W. 

 Maximum velocity for 5 minutes, 36 m per 



hour, 29th, IA., S.S.W. 

 E^revailing direction. West Southwest. 

 .Summary. 



North Northwest . 13 per cent 



West Northwest 13 " " 



Northwest 10 " " 



South Southwest 17 " " 



North 10 " " 



West" 10 " " 



Other directions 27 " " 



Weather. 

 Mean cloudiness observed .... 38 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . i52hours = 38 per cent. 



Number of clear days 11 



Number of fair days 15 



Number of cloudy days . ". 4 



Bright Sunshine. 

 Number hours recorded, 250 = 62 per cent. 

 Rain, 3d, 4th, 5th, Sth, 15 th, 16th , 22d, 



23d, 24th, 28th, 29th, 30th. 

 Snow, I5tli- 



Thunder and L.i^h(nin^, 5th, 28th. 

 Hail, I5tli, it>th. 



Gales. 35 or more miles per hour, 39m 2d, 

 S.S.W.; 39m, 6th, N.W.; 40m, Sth, 

 S.S..W.: 36m, 9th, N.N.W.; 45m; nth, 

 S.W.: 35m, i2th, N.W. ;39m, 22d, 

 W.N.W.; 39m, 23d, N.; 52ni. 24th, 

 N.: 39m. 25th, S.S.W.; 67m. 29th, 

 S.S-W. 



