158 Meteorological Observations for June 1830. 



Mean barometrical pressure for the month 29-860 



Spaces described by the rising and falling of the mercury 4-590 



Greatest variation in 24 hours 0-510. — Number of changes 24. 

 Therm. Max. 72°. June 25. Wind E.— Min. 45°. June 4. Wind W. 

 Range 27°.— Mean temp. of exter. air 57 0, 88. For 31 clays with in II 5672 

 Max. var. in 24 hours 19°-00.— Mean temp, of spring-water at 8 A.M. 49-80 



De Luc's Whalebone Hygrometer. 

 Greatest humidity of the atmosphere, in the morning of the 3rd ... 96° 

 Greatest dryness of the atmosphere, in the afternoon of the 19th 50 



Range of the index 46 



Mean at 2 P.M. 65°-0.— Mean at 8 A.M. 71°-9.— Mean at 8 P.M. 77'2 



of three observations each day at 8, 2, and 8 o'clock 71'3 



Evaporation for the month 3-40 inches. 



Rain in the pluviameter near the ground 2-63 inches. 



Prevailing winds, S.W. and W. 



Summary of the Weather. 

 A clear sky, 3; fine, with various modifications of clouds, 13; an over- 

 cast sky without rain, 8j ; rain, 5£. — Total 30 days. 



Clouds. 



Cirrus. Cirrocumulus. Cirrostratus. Stratus. Cumulus. Cumulostr. Nimbus. 



24 13 30 24 25 19 



Scale of the prevailing Winds. 

 N. N.E. E. S.E. S. S.W. W. N.W. Days. 

 4* 1 ]i 5 \ 6J 7 4 30 



General Observations.— The weather this month has been showery, with 

 the exception of about ten dry days at short intervals ; and the frequent, 

 but not heavy rains here have been generally accompanied with cold gales 

 of wind: so that from the comparatively weak sunshine, and humidity of 

 the atmosphere, the growth and ripening of most of the vegetables and 

 fruits, that are looked for at Midsummer, have been retarded. The various 

 kinds of corn, though backward for the season, look remarkably strong, 

 with a promising appearance for plenty. The unexpected continuance of 

 wet and ungenial weather for the last five weeks, it is hoped, will cause a 

 more favourable time for the operations of the ensuing harvest. 



Hay-making partially commenced here and in the neighbourhood about 

 the 20th instant ; but from a series of showers to the 28th, there was no 

 good opportunity of getting it in : therefore those who deferred cutting 

 their grass till the end of the month will have the best hay ; as a long 

 exposure to showery weather very much reduces its saccharine quality, 

 and is often the cause of its ignition in the rick. The crops of grass are 

 generally abundant from the nature of the weather, which appears to be 

 getting more settled for a few days. 



The mean temperature of the external air this month is nearly 3| de- 

 grees under the mean of June for the last fourteen years, and it is also 

 about a degree under the mean of May in 1822 and 1828 ! 



From 5 o'clock till nearly sunset in the afternoon of the 2nd, two fine- 

 coloured parhelia appeared, one on each side of, and each 22£ degrees 

 distant from the sun's centre : they alternately appeared circular and 

 elongated, and each displayed a white vaporous train sixteen degrees in 

 length, like the tail of a comet reversed, and it terminated evanescently, or 

 without defining its conical point. No trace of a solar halo accompanied 

 these phenomena, but a moist wind and vapours of the cirrostratus kind 

 were flowing in from the westward ; and their trains were formed by the 

 solar rays passing through the increasing vapour that surrounded them. 



In 



