688 



MR ROBERT COCKBURN MOSSMAN ON 



The following table shows the highest and lowest daily temperatures on the mean of 

 100 and 50 years respectively : — 







Mean 100 Years. 



Mean 50 Years. 





Highest. 



Date. 



Lowest. 



Date. 



Range. 



Highest. 



Date. 



Lowest. 



Date. 



Range. 



January, . 



o 



38-38 



20 



o 



35-86 



8 



2-52 



39-32 



30 



36-28 



6 



3-04 



February, 





39-52 



23 



37-61 



3 



1-91 



40-12 



18 



36-75 



9 



3-37 



March, 





43-02 



31 



38-86 



2 



4-16 



43-36 



31 



38-71 



1 



4-65 



April, 





47-47 



30 



42-62 



1 



4-85 



46-80 



30 



43-18 



1 



3-62 



May, . 





53-36 



31 



47-16 



2 



6-20 



53-20 



30 



46-69 



4 



6-51 



June, 





58-18 



29 



53-65 



3 



4-73 



58-29 



28 



53-40 



3 



4-89 



July, . 





59-20 



15 



57-29 



1 



1-91 



59-11 



15* 



57-48f 



1 



1-63 



August, 





59-23 



8 



56-21 



31 



3-02 



59-17 



12 



55-82 



31 



3-35 



September, 





56-46 



2 



51-08 



30 



5-38 



57-06 



2 



51-13 



30 



5-93 



October, 





50-71 



1 



43-83 



29 



6-88 



50-91 



1 



43-92 



26 



6-99 



November, 



44-60 



1 



39-06 



25 



5-54 



44-75 



1 



39-33 



30 



5-42 



December, . 



39-86 



4| 



36-42 



27 



3-44 



40-88 



5 



36-99 



23 



3-89 





59-23 



Aug. 8 



35-86 



Jan. 8 



23-37 



59-17 



Aug. 12 



36-28 



Jan. 6 



22-89 



* And 21. 



t And 4. 



And 5. 



It will be seen, from Tables III. and V., that the mean annual temperature of Edin- 

 burgh deduced from the observations of 50 and 100 years respectively differs by 

 only half a tenth of a degree. Owing to the great frosts experienced at the end of the 

 last and the beginning of the present century, the mean temperature of the winters was 

 more than half a degree lower than the values calculated from the shorter average, but 

 during the other seasons there was a slight excess during the longer period. 



The coldest day on the mean of 100 years is January 8, with an average tem- 

 perature of 35°*86, while the warmest is August 8, with a mean of 59 0, 23, showing an 

 extreme range in the daily temperatures of 23° - 37. For the fifty years the coldest day 

 is January 6, and the warmest August 12, with mean temperatures of 36°*28 and 59°"17 

 respectively, the annual range being 22°*89. On smoothing the curves it is seen that 

 the warmest day of the year clearly falls on July 15, and the coldest on January 8. 



Looking at the smoothed values in Tables IV. and VI. it will be observed that the 

 temperature on the mean of fifty years rises permanently above the annual average on 

 May 6 and remains above it till October 18, while on the average of 100 years the 

 respective dates are April 29 and October 18. On the long average, temperature is 

 thus above the annual mean on 173 days, and below it on 191, being just the average 

 on one day, viz., October 19. 



Mean Maximum Temperature. 



The following table shows the highest and lowest mean maximum temperatures on 

 the average of fifty years. (See Table VII.) 



