264 



Abstracts of the Makerstoun Observations, 1843. 



If we apply a correction to the monthly means, Table I., for the Sunday means awanting, which mav be 

 derived with sufficient accuracy from a comparison of the monthly means from the self-registering thermometers, 

 when the Sundays are included and omitted, we obtain the true means for 1843 as follow : — 



Jan. Feb. March. April. May. June. July- August. Sept. Oct. Nov. Dec. 



38°-4 33°-0 39°-3 44°-9 46°-7 51°-8 56°-8 57°-2 55°-? 42°-8 39°-4 45°-4 



Winter, 39°-0 ; Spring, 43°-6 ; Summer, 55°-3 ; Autumn, 46°-0. 



Mean Temperature for the year 1843 = 46°"05. 



It is evident that, for the year 1843, the months of January, February, and March constitute the meteoro- 

 logical season. Winter ; and July, August, and September constitute Summer. The means for this mode of 

 grouping are — 



Jan., Feb., March, 36°-9; April, May, June, 47°-8 ; July, August, Sept., 56°-6; Oct., Nov., Dec, 42°-6. 



TABLE III. — Mean Temperature of the Air at the Observation Hours for each Month and 



Quarter of 1843. 



Period. 



ISh. 



201". 



22i>. 



Oh. 



2''. 



41". 



eh. 



8i>. 



lOb. 



Mean. 



Range. 





o 



o 



O 



o 











o 



o 



o 



o 



o 



January 



38-10 



37-81 



38-07 



39-80 



40-60 



40-05 



39-30 



38-54 



38-07 



38-72 



2-79 



February 



31-85 



31 



99 



32-66 



34-94 



35-74 



35-20 



33-35 



32-18 



32-05 



32-98 



3-89 



March 



34-84 



35 



85 



39-22 



43-07 



44-76 



44-64 



42-08 



38-84 



37-91 



39-07 



9-92 



April 



39-26 



42 



70 



47-32 



49-47 



50-76 



50-17 



47-44 



44- 15 



42-40 



44-55 



11-50 



May 



42-10 



45 



18 



48-45 



50-62 



51-47 



50-98 



49-80 



47-13 



44-47 



46-57 



9-37 



June 



48-35 



51 



00 



53-41 



55-05 



55-92 



56-25 



55-47 



52-99 



49-24 



51-97 



7-90 



July 



5213 



56 



33 



59-73 



61-28 



62-41 



61-30 



59-66 



56-67 



54-10 



56-83 



10-28 



August 



50-10 



54 



26 



5946 



63-13 



64-91 



64-76 



62-25 



57-92 



55-25 



57-29 



14-81 



September 



47-80 



50 



96 



56-56 



61-77 



64-24 



64-10 



60-80 



55-50 



52-63 



55-22 



16-44 



October 



39-12 



39 



88 



43-60 



47-01 



47-77 



47-07 



43-32 



40-95 



40-17 



42-27 



8-65 



November 



38-22 



38 



68 



39-93 



42-30 



43-33 



42-03 



39-15 



38-49 



38-24 



39-59 



511 



December 



44-40 



44 



44 



45-98 



46-85 



47-35 



46-28 



45-07 



44-77 



44-59 



45-26 



2-95 



Spring 



38-73 



41 



24 



45-00 



47-72 



49-00 



48-60 



46-44 



43-37 



41-59 



43-40 



10-27 



Summer 



50-19 



53 



86 



57-53 



59-82 



61-08 



60-77 



59-13 



55-86 



52-86 



55-36 



10-89 



Autumn 



41-71 



43 



17 



46-70 



50-36 



51-78 



51-07 



47-76 



44-98 



43-68 



45-69 



1007 



Winter 



38-12 



38-08 



38-90 



40-53 



41-23 



40-51 



39-24 



38-50 



38-24 



38-99 



3-15 



The Year 



42-19 



44-09 



47-03 



49-61 



50-77 



50-24 



48-14 



45-68 



4409 



45-86 



8-58 



In obtaining the means for the month of January, the observations in the first week were rejected ; no 

 observation having been made at IB'^ in the second week, a correction was applied to the mean for that hour 

 of — 3°-29, obtained from Table I. as follows : — 



{Mean temp., Jan. 9—31 = 40°-32 minus, mean temp., Jan. 16 — 31 = 43°-81} = - 3°-29. 



The means were afterwards corrected by — 0°'9, in order to render the mean for the month similar to that 

 obtained, Table I., from the whole month. 



Diurnal Variation of Temperature. — The period of minimum temperature is not indicated by the above 

 observations. The maximum temperature occurs nearly at the following periods in the means for the four 

 meteorological seasons : — 



Spring, maximum temperature, occurs at I'' 30™ p.m. Makerstoun mean time. 



Summer, 1** 45'° 



Autumn, 1^35™ 



Winter, l^^ 10" 



The Year, 1^ SO"" 



If we examine the monthly means separately, it will be found that the maximimi occurs about the same 

 time, namely, l** 10"" in the months of January, February, May, July, October, November, and December, 



