NOTES ON THE METEOROLOGY AND MORTALETY OF 

 THE MONTH OF NOVEMBER, 1820. 



By E. Swabbreck Hall. 



Atmospheric pressure and terpperature this month closely approximated to 

 the mean of the 25 years' adopted standard, but rainfall was largely in excess, 

 the weather on the whole being highly propitious to health and life. No 

 November of the previous 13 years had so small a number of total deaths. 

 More especially were the deaths of young and middle-aged people the most 

 remarkable for their extreme rarity. 



Atmospheric pressure mean, 29 '816, was + 095 only above the 25 years' 

 adopted standard mean. The maximum, 30 '378, occurred on the 18th ; the 

 minimum, 20*150, on the 25th. The extreme range, 1*228 inches, has often 

 been exceeded. On the 14th there was a rise of the barometer of + '432 of 

 an inch, and on nine other days movements exceeding one-fifth of an inch. 



Wind-force, 85*95 lbs., was— 26*74 below the average, November being on 

 the whole the windiest month in a year. It was more continuous and steady 

 than usual, there being only four calms recorded, which is — 5 "67 below the 

 average. The strongest winds, 5*2J lbs. pressure only to the square foot, 

 were noted five times. North-%cest winds were recorded 41 times out of the 

 90 observations, and had rather more than half of the total force. Winds 

 from south-east to icest, the points most favourable to health, were nearly 

 equal to the former both in frequency and force. North, north-east, and east 

 were few and feeble. 



Temperature mean, 57*63 degrees, only deviated from the 25 years' mean by 

 the scarcely appreciable difference of an excess of ■\- 00*09. The loet-hulh 

 mean, 52 '06, was 4- 00*21 only above the mean. The maximum shade temper- 

 ature of the self -registering thermometer, 77, was noted on the 19th and 

 20th. «.- This is the lowest maximum since November, 1853, when 75 was re- 

 corded, and only one other year, 1846, had a lower maximum than the jpresent, 

 i.e., 76. In 1869 it was as high as 95. The minimum, 35, was registered on 

 the 27th. The lowest ever before was 38 in several years. The exti'eme range. 

 38 degrees, was very small, though last year had the same, but only one 

 other, 1863, had less, i.e., 37. 



Daily Range of temperature had the mean of 17*17 degi-ees, being — 1*31 

 below the average ; last year's was more than two degi-ees higher, and no year 

 since 1855 had one so small. The greatest range for any day was 27 degi'ees, 

 noted on the 4th. In 1861 the greatest range was the same, but every year 

 since has greatly exceeded this year's. 



Solar Intensity mean, 90*26 degrees, was — 11*55 below the average, and 

 the lowest on record, which is in a great measure accounted for by the rainy 

 and cloudy character of the month. The maximum record was made on the 

 5th, being 114 "5 degrees. 



Terrestrial Radiation mean, 45*12 degrees, was — 1"37 below the average. 

 No other year, except 1867, had so low a mean. The lowest temperature in 

 any night was 37*5 degrees. Many years have had lower minimums than this. 



Elastic force of Vapo^ir mean, 329, was -f 4 above the average. It 

 ranged from 225 to 494 during the month. 



Humidity mean, 75, notwithstanding the excessive rain-fall was — 1 below 

 the average. 



Rain -fall amounted to 4*82 inches, being + 1*98 above the 25 years' mean ; 

 but this was twice exceeded within the previous 29 years, i.e., 1849, — 8*94 

 inches ; 1842, — 5*84 inches. There were 18 days on which the rain fell, 

 which is -\- 5*18 more than the average. On the three days, 11th, 12th, 13th, 

 the aggregate fall was 2*02 inches, but on the 24th 1*92 was registered. Still 

 it fell so steadily that no damage of any moment was inflicted, and the 

 thorough cleansing it gave the streets, sewers, and rivulet was highly advan- 

 tageous to health. No snotv could be seen on Mount Wellington from the 

 city during the month, but visitors up there on the 9th repoi-ted its presence 

 in patches. 



Spontaneous Evaporation amounted to less than the rain-fall, i.e., 3*94 

 inches. 



