MR. G. V. VERNON ON TEMPERATURE AT OLD TRAFFORD. 251 



The coldest weeks in tlie 17 years^ average appear to 

 be those ending 7th and 14th January, and the warmest 

 that ending July 22nd. 



The week ending December 29th appears to be the one 

 in which the greatest variation of mean weekly tempera- 

 ture is likely to occm% and the one ending August 19 th 

 that in which the least variation occurs. 



Taking the mean differences for each month, we obtain 

 the following figures : — 







Mean difference 





 January ... • i6"40 



February . . . 







.. 18-62 



March 







.. 13-40 



April 







.. 12-05 



May 







.. 14-37 



June 







12.42 



July 

 August ... 







13-22 

 8-20 ■ 



September 







.. 10-26 



October . . . 







•■ 11-34 



November 







.. 13-62 



December 







.. 20-22 



From this table we see that the greatest amount of 

 variation occurs in December, and the least amount in 

 August. 



October does not appear to exhibit any abnormal varia- 

 tion, although, from the amount of barometrical oscilla- 

 tion doing so, it might have been expected it would do. 



I should like to see a much longer period observed for 

 determining the values of the mean weekly temperature 

 here, but hope, until such is the case, the values I have 

 given may be deemed worthy of the confidence so short a 

 period can deserve ; and I can safely say, as the great mass 

 of the observations were made by myself, that every care 

 has been taken in order that they might be made cor- 

 rectly. 



s2 



