BULLETIN No. 244. 



APRIL, 1909. 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGIIICULTUIUL EXPERIMENT 



STATION. 



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



Height of barometer above groiuid, ^i ft. Above sea level, 2yj.j ft. 

 Height of Wind InstruHients J 2 ft. 



MONTHLY SUMMARY. 



treasure. In. inches. 



Maxinuun reduced to freezing, 30 29, nth, 8 A 



I2th, 6 A 



Minimum reduced to freezing, 29,17, 7th, 6 p. 



Reducedt maximum reading, 30.60, nth, 8 A 



12th, 6 A. 



Reducedt minimum reading, 29.46, 7th, 6 p. 



Mean semi-daily reduced, 30.064 



Montiily range, i-i4 



*Atr Temperature. In Degrees Fahr. 



Highest So.o, 19th, 2 p. 



Lowest, 19.0, nth, 6 A. 



Mean hourly, 44-4 



Mean of means of max. and min., .... 45.1 



Mean sensible (wet bulb), 400 



Montiily range 61.0 



Highest mean daily, 5S.8, 7th 



Lowest mean daily 3i-4. loth 



Mean maximum, 564 



Mean minimum, 33-S 



Mean daily range, 22.6 



Greatest daily range, 35-5. 5th 



Least daily range, 8.0, 3d 



Humidity. 



Mean dew point, 35-5 



Mean force of vapor 291 



Mean relative humidity 763 



Precipitation. In inches. 



Total precipitation, 5-53 



Number of days on which .01 inch or more 



rain or melted snow fell, • iS 



Total snow in inches, tr^ice 



* Temperature in ground shelter. 

 t Reduced to freezing and sea-level. 



Wind. 



Total movement, 6679m. 



Greatest daily movement, . . . yosni., 8th. 



Least daily movement, 64m., 23d. 



Mean daily movement 223m. 



Mean hourly velocity, 9.3 m. 



iMaximum pressure per square foot, 27.5 lbs.= 



74111. per hour, 8th, 10 A., NNW. 

 Maximum velocity for 5 minutes, 44m. per 



hour 8th, 10 a., NNW. 

 Prevailing Direction, Northwest. 

 Summary. 



West Southwest 20 percent. 



North Northwest 17 " 



North 13 " 



North Northeast 10 " 



Northeast 10 " 



West 10 " 



Other directions, 20 " 



Weather. 



Mean cloudiness observed, .... 52 per cent- 

 Total cloudiness recorded by the Sun Ther. 



mometer, . . . iSi hrs.= 45per cent. 



Number of clear days, 10 



Number of fair days, n 



Number of cloudy days, 9 



Briffht Sunshine, 

 Number of hours recorded, . . 220 hrs. = 55?S 

 Rain. 2d, 3d, 6th, 7th, 9th, 13th, 14th, 15th. 



17th. 19th, 2ist, 22d, 23d, 25th, 26th, 27th. 



28th, 29th, 30th. 

 SnovT, 19th, 29th. 



Thunder and Lightning, 19th, 21st. 

 Hail, 19th. 

 Last Frost, 27th. 

 Gales, 35 miles or more per hour; 35m., 



4th., N.N.W^; 51m., 7th, N. N. W.; 74m., 



8th, N. N. W.; ^5111:. loth, N.; 35m-, nih, 



N.E.: 52m., 12th, W.; 47m-, lith., W.; 



49m., 14th, W.; 60m., 19th, W.S.W.; 35m., 



25th, W. S. W.; 40m., 28th, N. 



