MONTHLY WEATHER REPORT.

New Zealand Herald, Volume XIV, Issue 4900, 31 July 1877, Page 7

MONTHLY WEATHER REPORT.

Since our last Summary tho weather has bueu siugularly flue, the barometer having ruled very high, while the wind has been mostly light, and the vain most unusually small iu its amount, ami falling generally during the night;—a continuation of the weather that prevailed at tho end of June. The avornge height ot the barometer over tho four weeks from the Ist to tho 28th July, has been 30'!219, having been highest between tha loth and the 21st; and J"' vest between the 22nd and tho 2Sth. Its maximum elevation was reached on the .uorniuy of tho 16th, when it stood at 3(J'uu'O (corrected) beinj; only abcu' '01 bulinv the highest point of Juno ; th« iwest point to which it fell, with a N.E. gab. was 20'416 on the night of tlio 21st. From that iioint the merenry roso as rapidly as it had fallen to the morning of the 25th (•W'-tlli) ; and from that point has exhibited a gradual decline. Aβ the July average for the last thirteen years is only 29'S/o, the readings obtained for the month during the niv'■■nt year are unusually high. The approximate mean temperature for the fciiu' weeks is 49'4, or close upon three deg:i'.i li'jl'iwtho 13years'avoragoof52.3. This diminution of the temperature, which has been so marked as to excite uuivorsal observation aud remark is probably to bo a.-ciil ic-il to the unusual degree to winch the air has been charged with suspended moisture; the computed humidity having bc'-nS"' aa against an average of Very liille, however, of this atmospheric moisture has fallen in tho shape of rain; the total amount registered during tho month having only been l - 3-to inches. Tho greatest part of this has fallen during the hours of night. In liftecn days on which rain has been recorded, it is noted as under: — Times. Times. i'orouoon .. .. J Night .. ..12 Aftcrnom .. .. 6 Mghtonly.. .. 7 Afternoon only .. 2 .Morniu ~ ~ •! This deficiency in the rainfall contrasts very strongly with the two previous years, for in 1H75 there fell within July 4'G3O inches, and in IS7O o'2(is inches, tho approximate mean temperature for the month being then 53'5 ami o2 0 respectively.

Although the temperature has been gonerally low, it has been very eijuable, exhibiting no great extremes in either directiou. The maximum (lay heat has been (s'2'S, on tin; 7th; G'2'l is recorded for ono day, and OO'O to 61'0 on four others. On ono day only (4th) it fell to 49 5. The readings of tho remaining twentyone days all range between 50' and CO - The lowest night cold is noted for the 13th, as 3,")deg. 2min. ; twelve nights in all under ■lOdeg.; then ten nights between 40deg. and oOilog. ; and three nights (the 20th to tho 2'.!ikl) from 50deg. to 03deg. 2niin.

The approximate meitii dow point is 45'9; thu wind moderato, averaging 2-10 miles per day, or 10 miles per hour, with one heavy hurricane gale from the S. on the Sth, and one from the N.E. on tho 23rd, tho greatest velocity measured beiug 517 miles ou the former da - ; the direction S. and S.W. to W. andN.W. on twenty days, tlie remaining eight day., S.K, E., and .N.E.

Of cloud there haa been less than last month ; the sky both for day and night having been unusually clear. The average for the -nholo period is only 36, out of a maximum of 10. The niorniug readings only give, as usual, a little moro, but these only produce an average of 4"1.

So sdf.r radiation has been noted during the month ; but iu five nights tho terrestrial radiation has fallen below the freezing poiut; tho lowest of all being 27 '0 on the night of tbe 12th (civil time).

A misprint occurred iu the article printed in tho Saturday's issue of tho New Zealand Hr.itALD. The words "horary range" having been accidentally printed as " heavy range." The horary raugjo ia the fluctuation to which the barometric column is subject butwern one part of the day and another, arising principally from the varying temperature. Edwin B. Dickson, Meteorological Observer. Meteorological Observatory, Auckland, July 30, 1577.