. The climate and weather of Baltimore . 31, 1903, minimum liumiditj- was 20 per cent. April 5, 1904,May 4, 1904,Au^st 17, 1902,October 30, 1903,November 9, 1902, The limits of variability in the annual average humidity during 33years were per cent in 1892, and per cent in 1872, a range per cent. The ten-year averages have only varied from the normalfor the entire period by the following small departures: 1871 to 1880 below normal; 1881 to 1890 below normal; 1891 to 1900 above normal. Absolute Humidity. Expressing the humidity in the terms of th
. The climate and weather of Baltimore . 31, 1903, minimum liumiditj- was 20 per cent. April 5, 1904,May 4, 1904,Au^st 17, 1902,October 30, 1903,November 9, 1902, The limits of variability in the annual average humidity during 33years were per cent in 1892, and per cent in 1872, a range per cent. The ten-year averages have only varied from the normalfor the entire period by the following small departures: 1871 to 1880 below normal; 1881 to 1890 below normal; 1891 to 1900 above normal. Absolute Humidity. Expressing the humidity in the terms of the actual weight of the watervapor in the atmosphere at different hours of the day throughout theyear, the distribution is shown in the following table. These figuresshow the average amount of water present in the atmosphere at the hoursspecified during the five years from August, 1881, to July, 1886. Asthe amount of moisture in the atmosphere is primarily a function ofthe temperature of the air, we find a steady increase in the absolute. MARYLAXD WEATHER SERVICE 159 humidity from January, the coldest month, to July, the warmest monthof the year. MEAN ABSOLUTE HUMIDITY.(Weight of the vapor of water in grains per cubic foot.) Hours ofObservation Jan. Feb. Mar. Apr. 2 72 May July Aug. Sept. Oct. Nov. Dec. Year l.« R l>l\ fi is S fRT 11 a. m ; fi-fi>< 6 38 R ^a 1 88 3 437 1 83 1 3 327 Average Mean Vapor average monthly values of the tension of the vapor of water inthe atmosphere, based upon observations of temperature of the air andthe temperature of the wet-bulb thermometer at 8 a. m. and 8 p. 1893 to 1903, are shown in the following table
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