57 



Ai^ALYSIS OF THE OBSERVATORY RECORDS FOR JUNE, 1865 

 IN CONJUNCTION WITH THOSE OF BIRTHS, DEATHS, &o. 

 By E. Swarbreck Hall. 



Warm, sunny days, cold nights, with consequent high mean of daily -range of 

 temperature, very gentle serial .novenient, high atmospheric pressure, small 

 rainfall, and abundance of electricity and ozone, was the prevailing character 

 of the weather this mouth. Only once in the previous eight years was there 

 as small a mortality numerically (— 32) i.e., in 1857, but in the comparison, 

 both of ages, and classes of disease, the present mouth exhibits the healthiest 

 character of any June en record. 



At7)wspheric pressure mean was :— 29-982, being + -115 more than the average 

 of the 20 years' adopted standard, though — "049 less than June 1864 had. The 

 extremes were, 3O390, maximum, on the 14th; and 29 '308 minimum, on the 

 4th ; being a range for the month of 1 '082 inches. 1864, in this respect, 

 differed in a scarcely appreciable amount. The greatest movement of the 

 barometer on any day, was a rise of + "539 of an inch on the 26th. On nine 

 other days the movements exceeded one-fifth of an inch. The perturbations of 

 this instrument were much greater in June, 1864. 



Wind force was only 18-461bs., being — 6-80 below the average of the eight 

 preceding years, and less than any of them, except June 1860, which had only 

 13'261bs. The caZ??is were 46, being exactly the average. From every point 

 of the compass, except S.W., W,, and N.W., the winds both in force and 

 frequency, were below the average. N. W. greatly predominated in frequency 

 by the vane in Hobart city, yet other places had more from the W. and S.W. 

 Even a place so near us as Mount Nelson evinced this prevalence from the 

 pure ocean quarters. The strongest wind recorded had only 2'601bs. pi'essure 

 to the square foot, and was registered at the 7 a.m. observation on the 24th, 

 and at noon on the 30th. Pure, genial, gentle breathings of air, enjoyable by 

 everybody, marked this month with a note of admiration in the weather 

 calendar, and established its claim to having been the most delicious winter 

 month ever recorded. 



Teminrature mean 48*44 degrees, was + 1"31 above the 20 years' average, 

 and about a degree higher than June, 1864, had. By the self-registering 

 maxima and minima thermometers, the mean was 50'47 degi-ees. A peculiar 

 phenomenon, however, is entitled to special remark, thi* is the wide and 

 unusual difference between the mean of all the maxima and all theminhna; 

 the former bsing 61*60 degrees, and the latter only 39'33 degrees. The hottest 

 days were the 13th, 21st, and 23rd, having the maximum temperature of 70', 

 72", "72, respectively. No Jrme in the previous 24 years had so warm a 

 temperature as the latter. It is remarkable too that the barometer on these 

 days was very high also, being a very unusual accompaniment. The coldest 

 nights were the 5th and 11th, when the minima thermometer registered 32, or 

 freezing-point. The mean day-temperature in June last year was nearly five 

 and a hd,lf degrees colder, while the night-temperature was more than one and 

 three-quarter degrees warmer. ^ 



Daily range of temxterature had the mean of 22-27 degrees, bemg + 6-97 

 degrees above the 20 years' mean, and -f 7*14 more than June, 1864, had. 

 This, with the high atmospheric pressure, told heavily oi. aged and debilitated 

 persons, though innocuous to the young and healthy. The greatest range for 

 any day was 28 degrees, and was noted three times ; — on the 8th, 11th, and 

 22nd. The smallest range was 15 degrees, registered on the 7th. The corres- 

 ponding records of last year were 22 and 6; 



The solar thermometer had a mean of 78-98 degrees, which is + 4-49 degrees 

 more than the average of the previous nme years; 1855 was the only year 

 that had a higher mean. 1864 had less by — 6-52 degrees. The highest 

 temperature noted was 94 degrees on the 13th, Only 1856 had a higher 

 maximum. 1864 was five degrees less. 



Terrestrial radiation mean, 35-65 degrees, was —1-09 degrees below the 9 

 years' average, and only 1862 was colder, having a mean of but 34-71 degrees. 

 The extremes of the present mouth were 28*5 on the 5th, 47-5 on the 20th. 

 Singularly enough these extremes are precisely the same as in June, 1864, while 

 the mean for that month was more than two degrees higher than for this. 



