METEOROLOaiCAL OBSERVATORY 



OK TllK 



Hatcli Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



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



BULLETIN No 75. 



MARCH, 1895. 



MONTHLY SUMMARY- 



Pressure. In inches. 

 Actual niiixiniiun reading, . . 30.23,23d, 7 A. 

 Actual minimum reading, . -29.(10, 28111, 7 A. 



Mean reduced to sea level 29.998 



Monthly range, 1.23 



*Air Tetnperature. In Degrees Fahr. 



Highest 52; 49, 1st 



Lowest ]2,;i>.,6th 



Mean 33; 31.2 



Monthly Range 40. ; 44. 



Highest mean daily 45.9 ; 42. 



Lowest mean daily, 19.3; 19. 



Mean maximum, 40. ; 40.8 



-Mean minimum, 25.8; 21.5 



Mean daily i-ange, 14. ; 19.3 



Greatest daily range, 24. ; 28. 



Least daily range, 5. ; 8. 



Htimidity. 



Mean dew point, 26.2 



Mean force of vapor 1856 



Mean relative humidity, 80.6 



Wind. 



Prevailing Directions. 



South West 13 per cent. 



North VVe.st, 20 " " 



North 17 " " 



West, 17 " " 



Other directions 33 " " 



Total movement 4360 m. 



Greatest daily movement, . . . 435 m., 18th 

 Least daily movement, Om.;7th 



Mean daily movement, 140 m. 



Mean hourly velocity 5.8 ni. 



Maximum pressure per square foot, 20 lbs. = 

 63 m. per hour, 18th, at 3.30 P. 

 * frecijritatioii. In inches. 



Total precipitation, 2.71 



Weather. 



Mean cloudiness observed, ... .55 per cent. 



Number of clear days 10 



Numberof fair days 4 



Number of cloudy days 17 



Total cloudiness recorded by the Sun Ther- 

 mometer, .... 199 hours or 54 per cent. 

 Number of days on which .01 inch or more 



rain or melted snow fell, 13 



Number of inches of snow on the ground at 



the close of the month, .0 



Rright Sutishlne, 



Number of Hours recorded 172 



Rain, 1st, 2d,7th,Sth,13th,14th,24th,25th,28th. 

 Snoiv, 2d, 4th, 6th, 12th, 13th, 15th, 16th, 22d, 

 28th, 30th. 



Total fall in inches, 13 



Mean Ozone, 30 per cent. 



Thunder and Lightning, 25th. 



Halos, 



Solar, 11th 



Lunar, 8th 



Qales, of 35 or more miles per hour, 47, 5th, 

 N.W.;-10, 14th, N.W.; 47,17th, W.; 63,18th, 

 N.W.; 37, 19th, W.; 35, 2l8t, N N.W.; 40, 

 24th, S. ; 45, 25th, .S.W. ; 42, 26th, S. W. ; 47, 

 28th, N.*V.; 35, 29th, N. W.; 37, 30th, N. 



'The first llgures denote readings at top of tower, the second at base. 



