MONTHLY TEMPERATURE AT OLD TRAFFORD. 



277 



show that the probable variations during the period 1849- 

 1868 must have been much greater for some of the months 

 than those given from Dalton^s earlier period, especially in 

 the month of February. In 15 years of the Old-Trafford 

 observations, the variation of the mean temperature of Feb- 

 ruary from the mean of the period exceeded i°'8 (the 

 amount from Dalton's observations) very considerably. 

 The same may be said of other months, but not to the 

 same extent. 



Table I. — Mean Monthly Temperature at Old Trafford, 

 Manchester, 1861-1868. 



Year. 



Jan. 



Feb. 



Mar. 



Apr. 



May 



June 



July 



Aug. 



Sep. 



Oct. 



Nov.' Dec. 



1861 

 1862 

 1863 

 1864 

 1865 

 1866 

 1867 

 1868 





 35"o 

 38-1 

 42-4 

 35*6 

 35'o 

 397 

 33"2 

 38-9 







4o'o 

 4i'o 



4i"8 

 35-2 



35"5 

 347 



39*9 

 42-8 







43'o 

 42*0 



43-8 

 38-8 

 36-5 



35-5 

 37-2 



43-8 





 44*4 

 41-2 



47-6 

 48-3 



5o'5 

 47"3 

 487 

 46*2 





 49*3 



47-8 



50-9 

 54-2 



53-9 

 489 



53-3 

 55-3 





 56-6 



48-0 

 57-0 

 56-0 

 59-8 

 59-6 

 56-6 



57-5 





 59*3 

 567 

 51-5 



58-3 

 6r6 



57-0 



58-4 



63'3 







58-0 



52-4 

 55-6 

 58-1 



57-5 

 60-5 

 61-3 





 55-2 

 547 

 477 

 547 

 6o*9 



53-8 

 56-2 

 57-6 





 52-8 

 49-1 

 48-9 

 49-0 

 49-0 

 49-0 



477 

 46-6 





 38-0 



36-8 



45-0 



43"o 

 43-1 

 437 

 387 

 40-8 





 39-5 



43 'o 

 42-9 



48-5 

 41-9 

 41-6 



38-4 

 44-1 



Means, 

 1861 to 1868 37-2 



38-9 



40*1 



46-8 



517 



56-4 



58-3 



57-6 



55'i 



49*o 41*1 



40-4 



August, 1862. — Determined by reduction from the ob- 

 servations made at Eccles by Thomas Mackereth, Esq., 

 F.R.A.S. I may remark here that our observations are 

 nearly identical, or, where different, seem to be so almost 

 by a constant difference. 



January, 1863. — From Mr. Mackereth^s observations. 



April, May, June, July, August, and September, 1868. — 

 Taken from Mr. Mackereth's observations. 



