+ 5 



+ 5 

 +10 

 +15 

 +20 

 +25 



T r 



A 



Change of Mean Temperature from One Day to the Next 

 20° -10° -10° +20° 



— I 1 » 1 — — r 



+30° 



V \ 



A " \/N/ \ 





fc",^o*S^^ » 







X 



,0. y >o c ^::^:?i;^;;\>i 









October 

 Decembe 



- January 

 '' March 



April t^ 

 June " 



July to 

 Septemb 



+ 5 



i+10 



+15 



Figure 20. Daily Changes in Health compared with Changes of Mean 

 Temperature at New York City, 187T to 1884. 



I 



