METEOROLOGICAL OBSERVATORY 



OF THE 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of instruments above ground^ 51 ft. Above sea level, 260 ft. 



BULLETIN No. 65. 



MAY, 1894. 



MONTHLY SUMMARY- 



Hressiire. In inchea. 



Actual maxiimini reading, . 30.21, 12tli, 8 a- 

 Actual inininium reading, . 2'J.'2S, 25th, 4 A- 



Menu reiluceil to sea level, 30.00 



Monthly range 93 



*Air TetnperaUire. In Degrees Fahr. 



Highest 81.; 8).; Is' 



Lowest 35, 22nd; 29, 1.5th 



Mean, 58.6 ; 57.3. 



Monthly Range, 46. ; .'sS. 



Highest mean daily, 70.7; 68-2 



Lowest mean daily 49.6; 48. 



Mean maximum 6s. 5; 70-3 



Mean minimum 48.4; 44.3 



Mean daily range, 20.1 ; 26- 



Greatest daily range, 35. ; 43. 



Least daily range 8. ; 9.5 



Humidity. 



Mean dew point 52.6 



Mean force of vapor 4979 



Mean relative humidity, 65.8 



Wind. 



Prevailing Directions. 



South West 19 per cent. 



North 15 " " 



South 13 " " 



North West, 12 " " 



Other directions, . ....... 41 " " 



Total movement 2180 m. 



Greatest daily movement, . . . 229 m., 7tli. 

 Least daily movement, 1 m.; 23rd. 



Mean daily movement 70 m. 



Mean hourly velocity, 3 m. 



Ma.ximum pressure per square foot,14J lba.= 

 54m. per hour, 7th, at 12 M. 



* Precipitation. In inches. 



Total precipitation 2.92; 4.00 



Weather. 



Mean cloudiness observed, . . .52 per cent. 



Number of clear days 10 



Number of fair days 7 



Number of cloudy days, 14 



Total cloudiness recorded by the Sun Ther- 

 mometer, . . . 27.8 hours or 57 per cent. 

 Number of days on which .01 inch or more 

 rain or melted snow fell 13 



Frost, 15th, 22nd. 



Uright Sunshine, 



Number of Hours recorded 208 



Rain. . . 4th,6th,8th, 11th ,18th, ]9th,20th,23rd, 



24th,25th,28th,29th,30th ,31st. 

 Thunder and Lightning, .... 2nd,6th, 



18th, 19th. 

 Mean Ozone, 23.5 per cent. 



Halos. 



Solar 14th, 16th. 



Lunar, I6th. 



Gales, of 35 or more miles per hour, 35,2dd, 



W.N.N. ; .54, 7th,W.N.W.;35, 8th, N.W. 



42, 9th,N.W.; Sb, 13th, N.; 37, 14th, N.; 86, 



1.5th, N.; 35, 20th, N.E. 



*The first figures denote readings at top of tower, the second at base. 



