Tempeeature of the Aie. 



409 



TABLE V. — Diurnal Ranges of Temperature, as deduced from the Hourly Observations of the 

 Dry Bulb Thermometer, on each Civil Day of 1844. 



The quantities within parentheses are approximate ranges for the Sundays, deduced fi-om the last observa- 

 tion of Saturday, the first of Monday, and the maximum of the register thermometer, or from the latter and the 

 minimum of the register thermometer. 



Diurnal Range of Temperature. — From the means at the foot of Table V., it appears that the mean of 

 the diurnal ranges of temperature is less for the months about the summer solstice than for the months before 

 and after them. The gi-eatest mean ranges are those for April, May, and August ; the least mean range is that 

 for December. The mean of the ranges for the astronomical quarters, and for the year 1844, are as follow: — 



Winter, 8°-68 Spring, 14°-40 Summer, 16°-63 Autumn, 15°-13 Year, 13°-7l 



The mean ranges, as deduced from the minima and succeeding maxima of the register thermometers, are 

 for each month as follow ; — 



.Jan. Feb. March. April. May. June. July. Aug. Sept. Oct. Nov. Dec. 



10"9 ir-? 13°-1 18°-4 19°-4 18°-2 18°-7 19°-5 15°-9 13°-4 8°.4 6°-8 



These means are rather larger in the smnmer months than those deduced from the hourly observations, 

 bu' they follow the same law ; the means for the astronomical quarters are — 



Winter, 8°-74 Spring, 14°-43 Summer, 18°-75 Autumn, 16°-24 Year, 14°--54 



MAG. AUD WET. OBS. 1844. 5 j_ 



