BULLETIN No. 304. 



APRIL, 1914 



Meteorological Observations 



AT THK 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height of barometer above ground, 51 ft. Above sea level, 2yj.^ ft. 

 Height of Wind Instruments /2 ft. 



MONTHLY SUMMARY. 



Pressure. In inclies. 



Mhxuuuiu reduced to freezing, 30 12, ist, o A. 

 Minimum reduced to freezing, 29.06, 2d, 6 a. 

 Reducedl maximum reading, 30.43, ist, o A. 

 Keducedf minimum reading, 29.37, 2d, 6 A. 



Mean semi-daily reduced, 30.031 



Montlily range i-o6 



*Air Teinperature. In Degrees Fahr. 



Highest 83.5, 19th, 2:30 p. 



Lowest, 22.0, 4tli, 6 A. 



Mean liourly, 42.1 



Mean of means of max. and min 42.6 



Mean sensible (wet bulb), 3^ i 



Monthly range, 61.5 



Highest mean daily, 63.2, 19th 



Lowest mean daily, 3i-9. 4tli 



Mean maximum, 52-5 



Mean minimum, 32-8 



Mean daily range, i9-7 



Greatest daily range, 4i-o. i8th 



Least daily range, 3-o> '6th 



HuinUlity. 



Mean dew point 33-3 



Mean force of vapor 269 



Mean relative humidity, 75-5 



Precipitation. In inches. 



Total precipitation,- 6.59 



Number of days on which .01 inch or more 



rain fell ''J 



Total snow in inches 5-25 



•Temperature in ground shelter. 

 1 Reduced to freezing and sea-level. 



Wind. 



Total movement 6194m. 



Greatest daily movement, .... 401m., nth 



Least daily movement, sSm., Sth 



Mean daily movement 207 m 



Mean hourly velocity, 8.6 m 



Maximum pressure per square foot, 26.5 lbs.= 



73m. per hour, 12th, 6p., W. 

 Maximum velocity for 5 minutes, 45m. per 



hour, 12th, 5P., W. 

 Prevailing Direction, Northwest. 



Summary. 



North 13 per cent. 



North Northeast 13 " " 



Northwest 13 " " 



South 10 •' " 



West Southwest 10 " " 



North Northwest 10 " " 



Other directions 31 " " 



Weather. 



Mean cloudiness observed, .... 56 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, 2o8hrs. = S2 per cent. 



Number of clear days, 12 



Number of fair days, 5 



Number of cloudy days, 13 



lirig^ht Sunshine. 



Number of hours recorded, . . 194 hrs = 48?6. 

 Rain, ist, 2d, 3d, 5th, 7th, Sth, 9th, nth, 12th, 

 15th, i6th, 19th, 20th, 22d, 25th, 26th, 27th, 2Sth, 

 29th, 30th. 

 Hail, 15th, i6th. 

 Snow, 3d, 5th, 7th, 15th, i6th. 

 Frosts af er the i5th— -rSth, 24th. 

 Gales, 35 or more miles per hour : 51m, nth, 

 S.; 73m, i2tli, W.: 35ni, i3tli, N.W.; 35m, 15th, 

 E.N.E.; 36ni, 17th, N.; 38m, 19th, S.S.W.; 

 30ni, 20th, N.; 39111, 2ist, N.N.W.; 43m, 22d, 

 W.N.W.; 36m, 23d,N.N.W.; 36m, 3oth,N.N,E. 



