30 



RAIN AND HLaMlDlTY. 



Tbe total rainfall for the year was G2.S'.)0 iiiclies, an increase of almost 

 exactly 4 inches over that of 1S79. The greatest amount in any montli was 

 9.40") inches in Jimc. which is slightly less than the amount for June of last 

 year, that being also the month of maximum rainfiill. The smallest amount in 

 any month fell in December, being only .016 inches. In 1879 the rainfall was 

 smallest in Noveml)er, the amount being, however, more than 2 inches, 'i'he 

 greatest amount recorded in any one day is to be found under date of October 

 4th although the fall really took jilace on the night of the 3rd. The fall was 

 excessively heavy during the short time that it lasted and was accompanied by 

 a high wind whicli at once developed into the tvjjhoon of that date to which 

 reference is made in a preceding part of this report. The maximum number of 

 days in sucoession on wliich rain fell, was S. — from July 23 to August 1 — .ml 

 also from August 5th to Augu.<t 12tli. The maximum number of days in suc- 

 cession on which rain did not fall was 17, from January 4th to January 20th : 

 and from January 4th to February Gth there was only one day on which a 

 measurable quantity of rain fi'll. the amount then being liut one tenth of an 

 inch. The total number of days on which rain fell during the year was 160, 

 against a total of l.")G for the year 1S79. 



Of snow, — a trace is recorded on February 22nd and also on February 21>tli, 

 and on March 2nd the amount measured was 1.386 inches (melted). Snow fell 

 at no other time in the year. 



All of the important facts connected with the rainfall are exhibited in tables 

 N, 0, and Pand in charts 11 to IG, constructed from these tables, and others, a.s were 

 the corresponding charts in the report for last year. In chart Number 1 1 tlie 

 rainfall for every day in the year is shown, the actual amount of the rain being 

 equal to the length of the corresjionding line in inches. In charts 12, 13, 14, 

 and 15 the distribution of the rain according to the direction of the wind is 

 shown, both as to the number of rains and the actual amount of the fall. The 

 first diagram in chart Number IG shows the relative nundier of rainy, cloudy and 

 clear days in each month and the second exhibits the total rainfall in inches. 

 The fall of rain is probably more difticult than any otlicr meteorologioal i)heno- 

 menon to reduce to any great degree of regularity. A comparison of these 

 charts with those corresponding for the year 1879 will show, however, that some 

 degree of periodicity and regiilarity may bo assumed for the rainfall of this 

 locality. In charts 14 and 15 the rosnlts for the whole year are shown and 

 when placed side by side with those of the year 1879, thoy strengthen greatly 

 the conclusion reached in the last j"eport, that by far the greater part of 

 the rain comes from the Nortli and Northwest. The curves for 1880 have 

 shifted aroimd towanls the North, which is in exact accordance with the shifting 

 of the wind a« shown in the wind charts. When, however, comparison is made 



