232 



Mr. C. Chambers. 



Table I. — Containing Monthly and Annual Means of Daily Tempe- 

 rature-Range expressed in Fahrenheit degrees. 



Year. 



January. 



February. 



March. 



April. 



May. 



June. 



July. 



August. 



September. 



October. 



November. 



December. 



Mean of year. 



1847 











... 



8 '1 



7 *3 



8 "2 



8 '1 



12 '2 



15 - 4 



16 '2 





1848 



17 *6 



15 - 4 



13 "8 



11 -4 



10 -7 



8 *2 



7 - 4 



6 "8 



9 *5 



11 "0 



15 *4 



15 *3 



11 "9 



1849 



14 *9 



13 '9 



13 "2 



11 "9 



9 "9 



8 "2 



7 '2 



6 *7 



7 "2 



12 *3 



15 '0 



16 '5 



11 *4 





14 - 9 



18 "2 



13 "1 



11 "7 



10 *3 



9 - 9 



8 "2 



8 *1 



9 *0 



11 - 9 



15 "9 



15 "3 



12 "2 



1851 



15 *8 



15 - 2 



13 *4 



12 '7 



10 - 6 



9 -1 



6 '7 



7 "5 



9 *4 



11 *3 



13 *0 



16 '2 



11 "7 



1852 



16 "0 



14 '8 



14 "1 



13-2 



11 *8 



9 -3 



7 '5 



7 "2 



8 '0 



11 *1 



15 *2 



12 - 9 



11 "8 



1853 



15 - 8 



15 "0 



14*7 



12 - 6 



11 "9 



8 *5 



6 "5 



8 '5 



8 "3 



13 *1 



14 .3 



16 *1 



12 "1 



1854 



15*4 



15 - 9 



14 '4 



12 -4 



11 -5 



9 *2 



6 "5 



7 '9 



8 - 3 



11 -5 



13 *1 



12 *1 



11 "5 





13 - 8 



12 '6 



12 -8 



12-2 



11 -5 



9 -0 



7 "6 



9 -0 



9 *2 



11 *2 



13 *9 



14 - 1 



11 - 4 



1856 



13 *8 



13 *6 



11 *8 



12 "2 



11 - 2 



8 '8 



6 "6 



7 "8 



8 *4 



10 - 4 



13 "3 



13 "5 



10 '9 



1857 



12 '6 



14*8 



14 '1 



12 '2 



10 *8 



9 "7 



7 "4 



5 *4 



7 *3 



11 *2 



13 «2 



14 '9 



11 *1 





15 *0 



14 '2 



11 '8 



12 "1 



10 '6 



9 - 4 



7 "6 



7 "2 



8 "3 



11 .4 



13 '5 



13 •! 



11 *2 





13 "8 



12 '9 



13 *5 



11 "9 



10 "3 



9 '0 



8 "0 



6 '8 



8 '3 



10 "2 



12 "7 



14 '0 



10 *9 



1860 



14 "8 



12 -1 



12 "0 



10 "1 



9 '6 





5 *9 



7 *4 



7 *7 



10 '0 



15 '4 



15 "2 



10 "8 



1861 



14-3 



153 



12-5 



11-3 



10-7 



8-8 



5-6 



5-4 



8-1 



9-4 



13 6 



14-1 



10-8 





13-6 



14-7 



13-3 



11-5 



10-5 



8-3 



7-4 



7*7 



7-8 



10-2 



12-8 



15 -2 



11-1 





14-6 



16-5 



11-8 



11 -5 



10-6 



7-4 



7-0 



6-7 



8-4 



11-0 



14-0 



13-9 



11-1 





15-1 



14-0 



13-0 



10*9 



10-4 



8-9 



6-4 



7-0 



9-2 



12-1 



12-6 



14-7 



11 -2 





14*6 



13-3 



1-2-6 



11-3 



10-2 



9-5 



7-0 



6-3 



9-2 



11-1 



13-6 



12 -5 



109 





13-4 



13-7 



10 -8 



10-9 



9-2 



7-0 



5-9 



5-6 



7-9 



10-6 



14-0 



13-3 



10-2 



1867 



13*0 



13-7 



11-6 



9-5 



8-7 



7-3 



6-0 



5*6 



6-8 



10-0 



12-3 



13-2 



9-8 





13-0 



12-8 



11-0 



9-9 



9-1 



7-3 



6-4 



5-9 



7-7 



10-9 



13-6 



13-4 



10-1 



1869 



13-0 



12-4 



10 '6 



10-0 



9-2 



7-3 



6-3 



6-1 



6-6 



9-5 



12-1 



10-6 



9-5 



1870 



12-5 



12-9 



10-9 



10-5 



8-7 



7-5 



5-3 



6-3 



7-0 



8-9 



10-8 



12-0 



9-4 



1871 



12-8 



12-4 



11-7 



10-2 



8-6 



7-5 



6-5 



5-9 



6-9 



10-4 



11-1 



11-9 



9-7 



1872 



13-5 



14-2 



11 -1 



10-4 



9-0 



7-3 



5-3 



6-2 



7-1 



10-4 



13-4 



11-1 



9'9 



1873 



13-6 



11 -4 



10-3 



9-4 



8-6 



6-5 



4-8 



5-8 



7-0 



11-2 



12-3 



13'8 



9-6 



1874 



13'5 



13-3 



11-2 



10-0 



8-4 



7-1 



5-4 



6-3 



6-5 



10-4 



12-1 



12-5 



9-7 



1875 



13-4 



11-6 



11-0 



io-o 



8'9 



7-2 



6-7 



6-4 



6-1 



10-1 



12-4 



12-6 



9-7 



1876 



13-0 



13-1 



10-6 



9*8 



9-0 



7-5 



5-9 



6-5 



8-0 



11-3 



12-3 



13-8 



10-1 



1877 



12-3 



12-0 



11-5 



10-6 



9-3 



8-1 



7-4 



7-2 



8-4 



8-8 



12-3 



10-9 



9 '9 





12-8 



13-5 



11-3 



10-7 



9-4 



8-4 



6-8 



6-5 



7-7 



10-4 



10-6 



14-1 



10-2 



1879 



14-1 



12-6 



12 -6 



10 -6 



9-0 



7*2 



7-0 



6-0 



7-8 



10-4 



13-8 



15 -3 



10-5 



1880 



14-6 



13-6 



11-2 



10-4 



9-3 



8-2 



6-7 



7-2 



7-3 



10-1 



12-9 



13*9 



10-4 



Means for groups 

 of years. 

 1848 to 1851 ... 

 1853 to 1865 ... 

 1866 to 1872 ... 

 1873 to 1880 ... 



15-8 

 14-4 

 13-0 

 13-4 



15-7 

 14-2 

 13-2 

 12-6 



13-4 

 12-9 

 11 -1 

 11-2 



11-9 

 11-7 

 10-2 

 . 10 -2 



10-4 

 10-8 



8- 9 



9- 



8-8 

 8-9 

 7-3 

 7-5 



7-4 

 6-9 

 6-0 

 6-3 



7-3 

 7-2 

 5*9 

 6-5 



8-8 

 8-3 

 7*1 

 7-3 



11-6 

 11-0 

 10-1 

 10-3 



14-8 

 13-5 

 12-5 

 12-3 



15-8 

 14-1 



12- 2 



13- 4 



11-8 

 11-2 

 9-8 



io-o 



observations into distinct series at the times 1852'25 and 1866'0 ; and 

 we have made a further division at 1873*0, because the records after 

 that time are absolute ranges for the whole day, whilst those of the 

 preceding years were derived from a register in which the intervals 

 between the hourly observations were all blanks. The means at the 

 foot of Table I are for all the full years of the periods thus separated 

 to form distinct series of observations, and the general means for these 

 periods may, in the absence of immediate comparability of the records 

 of one period with those of another, and proceeding on a very rough 

 hypothesis, be used to reduce the whole series of monthly mean ranges 

 more nearly to a common scale, and thus to prepare them to exhibit, 

 though very doubtfully yet perhaps in the least objectionable manner 

 possible, any long-period variation with which they may be affected. 

 The rough hypothesis is that the general mean temperature-ranges 



