METEOROLOGICAL SUMMARY FOR THE YEAR 1884. 



589 



on June 25th; the highest daily velocity was 990 miles, on the 19th of January ; 

 the highest monthly velocity was 14,368 miles in January. The three windiest 

 months were January, March, and April; the three calmest months were June, 

 July, and August. The average velocity at 7 A. M. was 14.62 miles; at 2 P. M , 

 16.91 miles ; at 9 P. M., 14. 27 miles. 



Barometer. — Mean height of barometer column, 29.1 11 inches, which is 

 0.006 inch above the annual mean. Mean at 7 A. M., 29.133 inches; at 2 P. M., 

 29.091 inches; at 9 P. M., 29.109 inches; maximum, 29.881 inches, on January 

 4th ; minimum, 28.451 inches, on March 27th ; yearly range, 1.430 inches. The 

 highest monthly mean was 29.333 inches, in February; the lowest was 29.002 

 inches in April. The barometer observations are corrected for temperature and 

 instrumental error only. 



Relative Humidity. — The average atmospheric humidity for the year was 

 72.6; at 7 A. M., 83.1; at 2 P. M., 55.8; at 9 P. M., 78.8. The dampest 

 month was September, with mean humidity, 77.8; the dryest month was March, 

 mean humidity, 65.0. There were twenty-eight fogs during the year. The lowest 

 humidity for any single observation was 15 per cent, on March 12th. 



The following tables give the mean temperature, the extremes of temperature, 

 the number of inches of rain and snow, the number of rainy days, the number of 

 thunder showers, the mean cloudiness, the relative humidity, the number of fogs, 

 the velocity of the wind, the mean and extreme barometer heights for each month 

 of the year 1884, and a comparison with each of the sixteen preceding years : 



YEAR 1884. 



1884. 



January... 

 February.. 



March 



April 



May 



June 



July 



August 



September 



October 



November 

 December. 



Mean 



VTTr-3S 



20.99 

 28.03 

 41.56 

 50.42 

 62.24 

 71.07 

 76.93 

 71.14 

 70.36 

 57.87 

 41.53 

 23.54 



57.0 

 57.0 

 73.0 

 76.5 

 85.0 

 92.0 

 98.0 

 92.5 

 92.0 

 85.0 

 70.0 

 59.5 



-21.5 

 - 1.0 

 12.0 

 28.5 

 36.0 

 48.0 

 60.5 

 47.5 

 48.0 

 31.0 

 9.5 

 6.5 



t. P 



a 



ffl 



41.42 

 54.33 



58.87 

 55.76 

 50.54 

 38.78 

 41.67 

 48.16 

 40.00 

 34.19 

 40.77 

 66.34 



51.30178.1 25.4 3.64 2.4 10 3 47.56 72.6 210,932 29,11129,467 28,685 



73.9 



72.3 

 65.0 

 65.9 

 68.9 

 71.8 

 71.7 

 77.8 

 76.3 

 74.8 

 72.0 

 80.0 



14,368 



11,651 



14,229 



13,954 



9,978 



6,806 



8,733 



9,392 



11,409 



10,150 



10,503 



10,015 



W 



w 



29,313 



29,158 

 29,054 

 29,001 

 29,046 

 29,065 

 29,004 

 29,110 

 29,037 

 29,179 

 29,175 

 29,189 



29,881 

 29,469 

 29,465 

 29,321 

 29,299 

 29,270 

 29,289 

 29,405 

 29,404 

 29,568 

 29,563 

 29,666 



tc 



28,735 

 28,6S7 

 28,451 

 28,495 

 28,689 

 28,831 

 29,809 

 28,849 

 28,810 

 28,712 

 29,634 

 28,618 



