Seventeenth Annual Meeting. 125 



The last snow of spring was on April 21st. The first snow of autumn was on November 

 18th — 10 days later than the average date. 



FACE OF THE SKY. 



The mean cloudiness of the year was 47.56 per cent., which is 3.09 per cent, above 

 the average. The number of clear days ( less than one-third cloudy) was 146; half clear 

 (from one to two-thirds cloudy), 116; cloudy (more than two-thirds), 104. There were 

 75 days on which the cloudiness reached or exceeded 80 per cent. There were 33 en- 

 tirely clear and 43 entirely cloudy days. The clearest month was October, with a mean 

 of 34.19 per cent.; the cloudiest month was December, mean 66.34 per cent. The per- 

 centage of cloudiness at 7 a. m. was 53.89; at 2 p. m., 49.76; at 9 p. m., 39.03. 



DIRECTION OF THE WIND. 



During the year, three observations daily, the wind was from the S. W. 266 times, 

 X. W. 252 times, S. E. 201 times, N. E. 197 times, S. 76 times, N. 46 times, E. 37 times, 

 \V. 23 times. The south winds (including southwest, south and southeast) outnum- 

 bered the north (including northwest, north and northeast) in the ratio of 543 to 495. 



VELOCITY OF THE WIND. 



The number of miles traveled by the wind during the year was 131,188, which is 

 7,421 miles below the annual average for the eleven preceding years. This gives a mean 

 daily velocity of 358.44 miles, and a mean hourly velocity of 14.93 miles. The highest 

 hourly velocity was 75 miles, 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, 29.111 inches, which is .006 inch above the an- 

 nual 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 cor- 

 rected 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 driest month was March, mean humidity, 65.0. There were 28 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. 



