ABNORMAL VARIATIONS AT TORONTO. 113 



disagreement is the fact that many winds reckoned, in the later series, 

 as belonging to the N.E. group, blew from points, which, in the 

 earlier series, were included in the N.N.E. and E.N.E. groups. A 

 similar remark is applicable to the West winds. 



In this table the annual mean results only are given, but from an 

 investigation ma.le for each half-year in three years, 1860 — 62, the 

 following relations were found to exist : — 



With the N.E. wind and West wind the temperatures were above 

 the normal in some half years and below it in others, without reference 

 to the season. 



With the East and S.E. wind the temperature was above the normal 

 in each winter and below the normal in each summer, and with winds 

 from the South and S.W. the temperature was above the normal in 

 €ach separate half-year. 



In table V, we have the annual means of the diurnal changes in the 

 temperature without reference to sign. For reasons before explained, 

 the differences from which the means were derived are between 2 p.m. 

 and 2. p.m. for the first six years, and between 6 a.m. and 6 a.m. in 

 the years 1860, '61, and '62. The range in the numbers regarding 

 them as comparable* from the greatest 6°. 8 to the least 5°. 4, differs 

 little from that of the nine annual means of abnormal variation. 



In table VI. the monthly and annual means of the diurnal changes 

 of temperature are given for the earlier and later series separately and 

 jointly. For both series the differences have been taken between 

 6 A.M. and 6 a.m. on consecutive days. 



In both series, taken separately, the greatest diurnal change is in 

 February, and the least in July. Taking the two series in combination, 

 the greatest change is Q^'.Q in February, and the least change is S^.S 

 in July. The quarterly averages are 5°. 3 in spring, 4^.1 in summer, 

 6°. 5 in autumn, and 9°. 3 in winter. The general annual mean being 

 6^.25. 



It may be remarked that when the diflFerences are taken from 2 p. m. 

 to 2 P.M. the annual mean derived from the years 1854 to 1859 is 

 5°.83, and the range is systematically less in each separate year. On 

 the average of the six years the greatest monthly mean difference 



• The numbers derived from the earlier series are not strictly comparable with those from the 

 remaining three years.inasmuch as the average value, vrhen the dififerences are taken between 

 2 P.M. and 2 P.M. is about 0°.4 less than when the differences are between 6 A.M. and 6 A.M. 

 This may be accounted for by the fact that 6 a.m. is an hour slightly more subject to irregu. 

 larity of temperature than 2 p.m. 



Vol. IX. H 



