446 Results of Makekstoun Observations, 1844. 



Annual Variation of the Fall of Rain. — The greatest monthly falls of rain in 1844 were those for Septem- 

 ber and June; by the observatory-sjauge, 3-104 in. and 3-083 in. respectively: the least monthly falls were 

 those for December, May, and April, being by the same gauge 0-363 in., 0-546 in., and 0-681 in. respectively. 

 The sums for each of the meteorological quarters by the observatory-gauge are — 



in. in- 

 Winter. Dec, Jan., Feb., 4348. Summer. June, July, Aug., 7-147. 



Spring. March, April, May, 2859. Autumn. Sept., Oct., Nov., 7-425. 



in. 

 Year 1844, 21-779. 



The least amount of rain fell in the spring, and the greatest amount in autumn. The average fall of rain, 

 for one day in 1844 = 0-060 in. 



The greatest Falls of Bain, within 24 hours, for each Month, as obtained from the readings of the observa- 

 tory-gauge at noon, are as follow : — 



.Jan. Feb. March. April, May. June. July. Aug. Sept. Oct. Nov. Dec. 



in. in. in. in. in. in. in. in. in. in. in. in. 



0-535 0-525 0-420 0-187 0-336 0-766 0-517 0-293 0-939 0-513 0-696 0-088 



The greatest fall of rain for an astronomical day, in the year 1844, occurred September 14, and was 

 = 0-939 in. 



The numbers of days in each month of 1844, in which more than one-thousandth, one-hundredth, and 

 one-tenth of an inch of rain was found in the observatory-gauge, are as follow : — 



The greatest number of rainy days occurred in February and in October. In 1844, more than one- 

 thousandth of an inch fell on 213 "days, or on 58 days in 100 ; more than one-hundredth of an inch fell on 

 155 days, or on 42 days in 100 ; and more than one-tenth of an inch fell on 58 days, or on 16 days in 100. 



In dividing the amount of rain for each month by the number of days on which it rained 0-001 inch, we 

 obtain the following means ; — 



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



in. in. in. in. in. in. in. in. in. in. in. in. 



0-100 0-090 0-102 0-045 0-045 0162 0128 0094 0172 0062 0-154 0-030 



The numbers of days on wliich more than 0-001 inch of rain fell, together with the mean daily falls for 

 each meteorological quarter, and for the year, are as follow :- — 



in. 'u. 



Winter. No. of days, 54. Mean fall, 0-081. Summer. No. of days, 55. Mean fall, 0130. 

 Spring 43 0-066. Autumn 61 0122. 



in. 



The year 1844, No. of days, 213. Mean fall, 0-102. 



The mean fall was least when the number of rainy days was least, and, on the whole, gi-eatest when the 

 number of rainy days was gi-eatest. 



