cvm 



General Results of the Makeestoun Observations. 



The maximum extent of clouded sky occurs earliest in summer, at 9** a.m., and latest in autumn, about l*" p.m. ; 

 in the other two quarters, however, the value from 9*^ a.m. till S^ p.m. is nearly constant : the minimum occurs 

 earliest in autumn, about 8^ p.m., and latest in summer, near midnight. In the mean for the year the maxi- 

 mum occurs near 11^ a.m. and the minimum near lO'' p.m. The morning mean value occurs earliest in autumn 

 and latest in winter : the afternoon mean value occurs latest in autumn and earliest in summer. 



230. The ranges of the Diurnal Variations of the Extent of Clouded Sky are as follow : — 



■Winter=l-51, Spring =z 1-38, Summer = l-05, Autumn = l-59. Year=l-27. 



The diurnal range is therefore least in summer and greatest ra autumn and winter. 



Quantity op Rain. 



Table 101. — Quantity of Raia fallen at Makerstoun, according to the Observatory Rain-Gauge, 



for each Month in the Years 1832-1849. 



Year. 



Jan. 



Feb. 



March. 



April. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



Sum. 





in. 



in. 



in. 



in. 



in. 



in. 



in. 



in. 



in. 



in. 



in. 



in. 



in. 



1832 



1-58? 



1-33 



0-73 



0-93 



2-09 



4-70 



0-57 



3-96 



1-27 



3-71 



3-21 



1-89 



25^97 



1833 



0-42 



2-03 



2-85 



1-27 



0-87 



3-67 



1-96 



1-39 



2-30 



203 



1-30 



4^40 



24^49 



18.34 



3-37 



1-08 



0-75 



1-38 



0-71 



1-93 



3-80 



3-91 



3-20 



2-21 



1-84 



1-42 



25-60 



1835 



004 



2-93 



1-29 



0-76 



1-79 



0-51 



0-92 



2-12 



2-96 



3-20 



3-90 



1-50 



21-92 



1836 



1-99 



2-61 



2-29 



1-62 



0-49 



2-30 



4-24 



3-08 



208 



3-33 



3-25 



4-98 



32-26 



1837 



303 



1-47 



1-99 



3-18 



1-09 



2-21 



5-67 



3-13 



2-22 



1-35 



1-55 



2-13 



29-02 



1838 



2-12 



1-22 



1-90 



1-68 



1-94 



4-39 



2-54 



2-67 



313 



2-43 



2-14 



0-71 



26-87 



1839 



1-68 



0-98 



1-98 



0-31 



0-43 



2-86 



2-14 



2-13 



4-25 



3-34 



2-82 



2-22 



25-14 



1840 



3-05 



1-50 



0-82 



0-09 



3-75 



3-41 



3-10 



2-25 



3-16 



1-97 



2-72 



0-91 



26-73 



1841 



2-46 



1-17 



1-39 



1-99 



1-60 



1-87 



2-65 



4-07 



3-68 



5-95 



2-63 



214 



31-60 



1842 



1-73 



1-35 



2-30 



0-09 



2-27 



1-60 



1-800 



2-201 



3-080 



1-319 



1-846 



2^102 



21-688 



1843 



1-978 



1-926 



0-934 



2-231 



3-237 



1-311 



2-676 



2-752 



1-080 



3645 



2-038 



0949 



24-757 



1844 



1-904 



2-081 



1-632 



0-681 



0-546 



3083 



2-553 



1-511 



3-104 



1-541 



2-780 



0^363 



21-779 



1845 



1-325 



0-712 



1-283 



1-261 



2-217 



2-935 



1-460 



3-158 



1-838 



4-247 



1-699 



1^853 



23-988 



1846 



1-901 



1-827 



2-293 



2-272 



2-975 



2-761 



7-124 



4-738 



4^586 



3-506 



2054 



1^817 



37-854 



1847 



0-624 



0-484 



0-330 



1-201 



4-335 



1-970 



2-099 



1-035 



1-375 



2-778 



1-839 



4006 



22-076 



1848 



1-166 



3-780 



3-350 



1-028 



0-350 



3-826 



1-294 



3-223 



1-182 



4-152 



2-252 



1-627 



27-230 



1849 



2-775 



1-305 



0-929 



2-480 



2-831 



2-379 



2-383 



2-547 



1-973 



2-417 



1-309 



2-000 



25-328 



Monthly 

 Mean. 



1-841 



1-655 



1-613 



1-359 



1-862 



2-651 



2-721 



2-771 



2-582 



2-951 



2-288 



2-056 



26-350 



Daily 

 Mean. 



•0594 



•0585 



-0520 



-0453 



0-601 



-0884 



•0878 



•0894 



-0861 



•0952 



•0762 



•0663 



0-0722 



231. The quantities in Table 101, from July 1842 till December 1849, were obtained from the Observa- 

 tory gauge, which has its funnel-mouth 8 inches above the sod ; the quantities from January 1832 till June 

 1842 are the amounts of rain found in the garden gauge (6^ feet above the soil), multiplied by factors, constant 

 for each month, which express the ratios of the amounts of rain found in the Observatory gauge to those found 

 in the garden gauge during 6 years ; these ratios are as follow : — 



Jan. 



Feb. 



March. 



April. 



May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



1-056 



1-030 



1-029 



1-118 



1-071 



1-076 



1-070 



1-058 



1-078 



1-081 



1-061 



1-172 



The amounts of rain, therefore, in Table 101 were either obtained directly from the Observatory gauge, or they 

 are such as would have been obtained in that gauge. 



232. The mean yearly amount of rain at Makerstoun by the Observatory gauge from 18 years' obser- 

 vations = 26-350 inches. 



233. The least amount of rain for any of the 18 years was obtained in 1842, when it was 21-688 inches ; 

 the amounts for 1835 and 1844 were little more. The greatest amount of rain occurred in 1846, being 37-854 

 inches. The least monthly fall of rain occurred January 1835, being only 0-04 inch. The greatest monthly 

 fall of rain occurred July 1846, being = 7*124 inches. 



