1:^2 



SUMMARY OF WEATIlEil AND HEALTH IN 1869, 

 [Bt E. Swaebreck Hall.] 



The weather generally iu 1865 was of the most favorable character. 



Atmospheric mean pressure for the j^ear was 21)-848, which is only + '040 

 above the 20 years' mean of the adopted standaril. February, May, Septenn- 

 ber, December, bad means below the average, but all the other months 

 were above it. The greatest pressure noted was 30"566 on the 8tli August,aad 

 the lowest was 28 '885 on the 14th May, the extreme range for the year, there- 

 fore, being 1"681 inches. 



The total wind-force of the year was 75-1 'OG lbs., being— 12'84 lbs. less than 

 the average of the previous eight years. The strongest winds recorded had a 

 pressure to the square foot of ]0'42 lbs., and were registered three times, all 

 in November — only two ^oi ?<'t«(7s were noted in the twelve months, on the 

 31st October and 1 Ith November. 



The mean temperature of the year was 54 '60 degrees, being only — "32 less 

 than the average of the 20 years. March had the hottest mean, being 60'90 

 degrees — 'July, the coldest, had 49'15 degrees. The maximum temperature 

 of any day in the year was 95 degrees, on the 11th November; and the mini- 

 mum was 30 degrees in the night of the 10th July. 



The year's mean of the daily range of temperatia-ewas 20*24 degrees, being 

 + 2 "08 above the mean of the 20 years. November had the highest mean 

 daily range, 22"73 degrees, and February the loivest, 18'50 degrees. The 

 greatest range on any day was 42 degrees, on the 11th of November. 



Solar intensitif h&d a -mean for the year of 93 '90 degrees, November having 

 the maximum 1 7 '73 degrees, and July the minimum 77 00 degrees. The 

 highest single record was 129 degrees on the 11th Noven.ber. This year's 

 November has taken a very unusual position as to temperature in comparison 

 with other months and years. 



Terrestrial radiation mean for the year was 42'6'1 degrees ; February had 

 the highest mean, 48 '28 degrees; June the lowest, 35 '65 degrees. The mini- 

 mum temperature was recorded on the 10th July, being 27*00 degrees. 



jE'^as^tc /orce o/ t'opor mean for the year was 3, 15, being — 2 less than the 

 20 years' mean . February had the maximum, 393 ; July the minimum, 251. 

 February had the highest record for any day in any month of the year, 628, on 

 the 27th ; the minimum was 160 on the 12th June. 



Humidity mean for the year was 73*08, being — 1*75 less than the 20 years' 

 average. May had the highest mean, 79 ; November the lowest, 66. Satura- 

 tion, 100, was frequently recorded. 



The year's rainfall amounted to 23*07 inches, being + 1*55 above the twenty 

 years' average. It was distributed throughout the twelve months with more 

 than the average equality. December had the maximum, 3*43 inches ; January 

 the minimum *63 of an inch. It is noteworthy, however, that, while the former 

 was twice exceeded in quantity in the previous twenty-four years, it had had a 

 minimum as low as '11 of an inch in 1842, and in nine other years less than on© 

 inch ; the mean of the 20 years for December being 1 •32 inches. January had 

 a misinmumof '03 of an inch in 1841, and in eight other year less than one 

 inch, the 20 years' mean being 1*50 inches. There were 146 days out of the 36-5, 

 on which more or less rain fell, the minimum being 0*1 frequently, the maximum 

 1*22 inches on the 9th of October. Agriculturists, therefore, as well as sani- 

 tarians had no just grounds for complaint on this score in 1865, presuming that 

 the Hobarton records is a fair mean for the whole island. Many parts of the 

 colony had certainly a much greater deposit of rain, possibly others, however, 

 had much less. 



The year's S2>on(;fmeons cvapora^/on. e:^ceeded precipitation by -f 14*30 inches. 



Cloud mean for the year was 6*20, being + 55 m.ore than the average of the 

 20 years. January, September, and October were the cloudiest months, and 

 almost identical in their means, June, August, and November were the least 

 cloudy, and scarcely differed in their means. 



The year's mean for Ozone was 8*17, considerably exceeding any other of the 

 eight years recorded. Every month had a mean above its average. 



Electricity was more than u.sually abundant, but without any violent disturb- 



