Mr. Luke Howard is the author of a highly useful work, entitled “The Climate of London, deduced from Meteorological Observations, made at different places in the neighbourhood of the Metropolis: London, 1818.” 2 vols. 8vo. Out of this magazine of fact it is proposed to extract, from time to time, certain results which may acquaint general readers with useful knowledge concerning the weather of our latitude, and induce the inquisitive to resort to Mr. Howard’s book, as a careful guide of high authority in conducting their researches. That gentleman, it is hoped, will not deem this an improper use of his labours: it is meant to be, as far as regards himself, a humble tribute to his talents and diligence. With these views, under each month will be given a state of the weather, in Mr. Howard’s own words: and thus we begin. JANUARY WEATHER The _Sun_ in the middle of this month continues about 8 h. 20 m. above the horizon. The _Temperature_ rises in the day, on an average of twenty years, to 40·28° and falls in the night, in the open country to 31·36°--the difference, 8·92°, representing the mean effect of the sun’s rays for the month, may be termed the _solar variation_ of the temperature. The _Mean Temperature_ of the month, if the observations in this city be included, is 36·34°. But this mean has a range, in ten years, of about 10·25°, which may be termed the _lunar variation_ of the temperature. It holds equally in the decade, beginning with 1797, observed in London, and in that beginning with 1807, in the country. In the former decade, the month was coldest in 1802, and warmest in 1812, and coldest in 1814. I have likewise shown, that there was a tendency in the _daily_ variation of temperature through this month, to proceed, in these respective periods of years, in opposite directions. The prevalence of different classes of winds, in the different periods, is the most obvious cause of these periodical variations of the mean temperature. The _Barometer_ in this month rises, on an average of ten years, to 30·40 in., and falls to 28·97 in.: the _mean range_ is therefore 1·43 in.; but the extreme range in ten years is 2·38 in. The mean height for the month is about 29·79 inches. The prevailing _Winds_ are the class from west to north. The northerly predominate, by a fourth of their amount, over the southerly winds. The average _Evaporation_ (on a total of 30·50 inches for the year) is 0·832 in., and the mean of De Luc’s hydrometer 80. The mean _Rain_, at the surface of the earth, is 1·959 in.; and the number of days on which snow or rain falls, in this month, averages 14,4. A majority of the _Nights_ in this month have constantly the temperature at or below the foregoing point.[4]