The CLIMATE of Buenos Ayres, taken generally, is decidedly good, and more congenial to English habits than that most places abroad. Its salubrity, however, is overrated: a consumptive person must not think of coming here; many of that class have been obliged to fly to Mendoza and other climes, to escape the vicisitudes of this. The spring months of September, October, November, and the autumn ones of April and May, are the most agreeable parts of the year. The thermometer, at those seasons, averages about 60; and we have repeated clear and bracing weather, intermingled, however, with inclement days. The summer is not so hot as the latitude would denote. A sea breeze sets in, at times, towards the afternoon; but this is not regular. December and January are the hottest months. On some days of oppressive heat, the thermometer may average 80, and at others, the pleasing temperature of 70 and 75. In January, 1824, for nearly a week it was 96 in the shade: the oldest inhabitant never remembered such a continuance of heat. When the heat is at the greatest, a _pampero_ suddenly comes, with its accompaniment of rain, thunder and lightning, and cools the air. These Pampero winds from the W. and W.S.W. with nothing to impede their progress across the extended Pampas, blow with great violence, raising clouds of dust, and obliging every one to close windows and doors. Being off the land, they are not dangerous to shipping; though vessels at the mouth of the river have been blown in sea hundreds of miles, by a Pampero. The thunder and lightning to an European is terrific: the lightning is often dangerous. The dust, fleas, and musquitos, render the summer months very disagreeable. The fleas are a great annoyance, the houses being filled with them; the very dust breeds them; and they seem to have a great partiality for foreigners. I don't observe that the natives heed them. They laugh at the English mode of washing the rooms to get rid of these vermin; their plan is, to strew the room with fennel, sweeping that and the fleas altogether into the street. Musquitos are another of the disagreeables. A north wind, in summer, is very unpleasant, the heated atmosphere relaxing both mind and body. The combined effects of heat, dust, and wind, make the enjoyment of an evening promenade extremely precarious. In summer, the pastures frequently catch fire, from the intenseness of the heat. In 1821, Mr. Halsey, an American gentleman, who has a large sheep farm, sustained a considerable loss by an event of this kind, many of his sheep having been burnt. The same heat that occasioned Mr. Halsey's loss brought on a violent Pampero; and, from the dust and burning ashes that enveloped the city, one might have supposed that the days of Herculaneum and Pompeii were about to return.