Temperature of the Air. 



409 



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

 Dry Bulb Thermometer, on each Civil Day of 1844. 



Civil 

 Day. 



Jan. 



Feb. 



March. 



April. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 





o 



o 



o 



o 



o 



o 



o 



o 



o 



o 



o 



o 



1 



8-9 



11-6 



8-8 



25-9 



37-8 



131 



18-0 



10-1 



(26-0) 



7-0 



3-8 



(6-0) 



2 



16-5 



6-9 



8 



7 



10 



8 



28-9 



(10-0) 



15-7 



17-4 



31-8 



8-9 



3-1 



3-3 



3 



12-0 



13-4 



(7 



o) 



9 



8 



34-4 



23-0 



14-3 



21-3 



22-6 



12-4 



(3-4) 



5-5 



4 



6-2 



(14-0) 



8 



8 



11 







60 



25-7 



13-5 



(24-0) 



11-5 



10-7 



3-6 



9-8 



5 



11-7 



15-8 



14 



1 



23 







(15.0) 



120 



12-7 



9-8 



11-5 



15-7 



2-8 



111 



6 



6-8 



20- 1 



9 



3 



23 



7 



24-6 



14-9 



107 



13-7 



5-8 



(18-0) 



31 



11-8 



7 



(10-0) 



150 



12 



1 



(20 



o) 



24-6 



10-6 



(20-0) 



7-9 



13-7 



17-4 



11-8 



16-9 



8 



7-4 



10-2 



10 



2 



15 



7 



27-7 



13-8 



24-4 



10-4 



(5-0) 



22- 1 



120 



(10-0) 



9 



4-6 



4-9 



10 







13 



1 



35-1 



(21-0) 



11-6 



9-7 



8-8 



6-5 



8-2 



5-2 



10 



10-6 



8-9 



(6 



0) 



21 







8-0 



17-9 



18-0 



19-7 



14-6 



16-2 



(6-0) 



4-6 



11 



7-9 



(14-0) 



13 



5 



15 



6 



5-9 



23-0 



11-1 



(22-0) 



21-3 



12-5 



8-6 



31 



12 



9-8 



16-7 



12 



1 



12 



1 



(20-0) 



15-4 



14-1 



14-7 



16-6 



18-7 



6-6 



4-2 



13 



11-0 



9-7 



12 



8 



14 



8 



27-3 



15-1 



13-4 



18-5 



20-4 



(8-0) 



61 



8-3 



14 



(14-0) 



6-7 



17 



3 



(18 



o) 



12-7 



10-6 



(7-0) 



17-8 



5-5 



12-2 



11-0 



21 



15 



14-3 



131 



3 



5 



14 



2 



19-0 



123 



19-6 



8-4 



(90) 



8-5 



16-6 



(3-0) 



16 



6-3 



10-3 



3 



5 



21 



6 



26-4 



(22-0) 



21-9 



161 



14-3 



110 



5-4 



4-7 



17 



12-6 



6-5 



(17 



o) 



15 







14-3 



23-3 



24-5 



7-4 



4-9 



5-2 



(5-0) 



4-7 



18 



15-7 



(7-0) 



26 



3 



11 



7 



16-3 



6-9 



15-3 



(16-0) 



11-7 



16-7 



3-2 



3-6 



19 



14-4 



130 



14 



3 



15 



6 



(15-0) 



100 



15-2 



14-1 



9-6 



19-3 



6-2 



13-5 



20 



7-1 



7-5 



14 



3 



17 







9-7 



21-8 



18-0 



11-8 



16-6 



(17-0) 



10-4 



7-9 



21 



(12-0) 



15-6 



16 



8 



(14 



o) 



13-6 



13-4 



(16-0) 



12-5 



20-4 



221 



17-8 



111 



22 



15-5 



20-8 



14 



6 



13 







18-7 



15-8 



201 



6-6 



(22-0) 



190 



11-2 



(4-0) 



23 



14-4 



13-4 



11 



2 



14 



9 



21-7 



(25-0) 



31-8 



15-7 



17-9 



26-3 



9-2 



3-4 



24 



15-2 



5-9 



(9 



o) 



11 



7 



13-5 



14-8 



71 



191 



210 



21-5 



(14-0) 



3-6 



25 



11-5 



(10-0) 



10 



2 



21 



3 



14-7 



8-0 



16-5 



(21.0) 



24-4 



10-2 



11-9 



1-6 



26 



10-6 



9-9 



18 



2 



17 



5 



(14-0) 



7-4 



13-1 



15-8 



8-8 



5-9 



17-5 



3-7 



27 



5-0 



25-2 



17 



9 



17 



3 



120 



11-3 



17-6 



22-9 



12-6 



(13-0) 



2-9 



9-3 



28 



(7-0) 



10-3 



21 



1 



(30 



0) 



13-3 



16-9 



(19-0) 



23-8 



15-5 



16-1 



3-2 



10-0 



29 



18-4 



7-2 



19 







33 



3 



8-7 



14-7 



14-1 



32-2 



(18-0) 



120 



10-1 



(10-0) 



30 



130 





32 







35 



6 



9-4 



(26-0) 



12-4 



28-6 



22-9 



2-7 



9-8 



8-5 



31 



7-2 





(15-0) 





9-6 





9-2 



21-7 





3-4 





12-2 



Mean 



10-9 



11-8 



13-4 



17-9 



18-0 



15-9 



16-0 



16-5 



15-5 



13-4 



8-2 



70 



The quantities within parentheses are approximate ranges for the Sundays, deduced from 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 greatest 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°P ll°-7 13°-1 18°-4 19°-4 18°-2 18°-7 19°-5 15°-9 13°-4 8°-4 6°8 



These meaus are rather larger in the summer 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, l6°-24 Year, 14°-54 



MAG. AND MET. OBS. 1844. % 5 l 



