LIBH^KY Of iHt 

 MassachiisHis Auricultiiral College, 



AMHERST, MASS. 



BULLETIN No. 438. 



JUNE. 1925 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPEllIMENT 



STATION. 



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



Hei_^ht of barometer above ground, 31 ft. Above sea level, 2jj.^ ft. 

 Height oj Wind Instrutnents 72 ft. Tiine used, J^th Mer. 



MONTHLY SUMMARY. 



Pressiiie. In inches. 



Maximum reduced to freezing, 30.03, 13th, 8 A. 

 Minimum reduced to freezing, 29.28, iSth, 2 p. 

 Reduced maximum reading, 30.32, 13th, S A. 

 Reduced minimum reading, 29.56, iSth,2P. 



Mean semi-daily reduced 29.95S 



Montlilv range 0.74 



Air Temperature. In Degrees Fahr. 



Highest 97.0, -th, 4 p. 



Lowest 42.0, i2th, 5:30 A: 24th 6 a. 



Mean hourly 6q.6 



Mean of means of max. and min 69.2 



Mean sensible (wet bulb) 63.3 



Monthly range 55.0 



Highest mean daily 86. i, 6th 



Lowest mean daily 53-8, 25th 



Mean maximum 81.4 



Mean minimum 57- 1 



Mean daily range 24.3 



Greatest daily range 38. 5, 17th 



Least daily range 5.0, 25th 



Humidity. 



Mean dew point 60.6 



Mean force of vapor 709 



Mean relative humidity 78.1 



Precipitation. In inches. 



Total precipitation, in inches 4.28 



Number of days on which .01 inch or more 

 rain fell 13 



Wind. 



Total movement 4072.™ 



Greatest daily movement 255ni, nth 



Least daily movement 59m, 8th 



Mean daily movement i36ni 



Mean hourly velocity 5.7m 



Maximum pressure per square foot, 13.0 lbs = 



51 m per hour, ist, 5 p., N.N.W. 

 Maximum velocity for 5 minutes, 30m per 



hour, ist, 5 p., N.N.W. 

 Prevailing direction, Southwest. 



Summary. 



South Southwest 27 per cent 



South 17 " " 



North 10 " " 



Southwest JO " " 



West Northwest 10 " " 



Other directions 26 " " 



Weather. 



Mean cloudiness observed , ... 53 per cent 

 Total cloudiness recorded by the .Sun 



Thermometer . .160 hours = 35 per cent 



Number of clear days 13 



Number of fair days 12 



Number of cloudy days 5 



Briiiht Sunshine. 



Numloer hours recorded, 297 = 65 per cent. 



Rain. 1st, 2d, gth, loth, 14th, 15th. i6th, iSth, 

 2ist, 23d, 24th, 25th, 28th, 2gth, 30th. 



iHail. 21st. 



iThnnder and Liiihtninii, ist, 9t)i, 15th, 

 i8th, 21st, 27th, 2Sth, 29tli. 



Gales. 51m, 1st, N.N.W.; 35m, 5th, N.W.; 

 I 39m, 16th, N. 



