  The climate of any country, or in other words, its average weather, by which, again, we mean its temperature, rainfall, and hours of sunshine, as well as the dryness or otherwise of its air, depends upon various circumstances and conditions, but especially upon geographical position, that is to say, upon the nearness of the country to the equator, upon its distance from the sea and its height above sea-level; partly also upon its soil and vegetation. Speaking generally, the nearer we approach the equator the hotter will be the climate, and the nearer to the sea-coast the milder and more equable it will be. The highest temperature in the shade ever yet recorded, however—127° Fahr.—was in the Algerian Sahara, at a spot not even within the tropics; and the The climate of the British Isles is very greatly influenced by the great ocean current, often called the Gulf Stream, from its supposed source in the Gulf of Mexico, which, impelled by steady winds, carries a constant stream of warm water from the equatorial regions towards the north pole. This current washes the shores of these islands, and it is this circumstance which makes our winters so much milder than those of Labrador, which is no nearer to the pole than we are. Were it not for the Gulf Stream our weather would probably be more severe than that of Newfoundland. The highest shade temperature ever experienced in Britain was 101° Fahr., at Alton in Hampshire, in July, 1881; and the lowest was 10° below zero, Fahr., at Buxton in Derbyshire, in February, 1895. A temperature of 23° below zero is said to have been measured in Berwickshire, in 1879, but the correctness of the record has been questioned. What is, however, of more importance, is the average temperature for the year, which, for the whole of England, is 48° Fahr. The sunniest part of England lies, as might be expected, along the south coast, although the south-east and south-west coasts also get more sunshine than inland districts in the same latitude. The sun is above the horizon in this country for more than 4450 hours in the year; but, owing to the frequent presence of clouds, he is not visible for even half that time in any part of the The Winter Garden at Torquay The climate of a country, however, depends not only upon the sunshine, but upon the rainfall. The amount The rainfall varies very much in different parts of England, but the average amount for the whole country is about 33 inches in a year. When we speak of an inch of rain we mean that it would lie an inch deep on a perfectly level piece of ground. Thus, if all the rain that fell in a year stayed on the ground, and did not evaporate, or run away, or sink into the earth, the water would be 33 inches deep all over England at the end of the twelve months. An inch of rain all over an acre of ground weighs rather more than 100 tons. Not only does the rainfall vary in different parts of the country, but it varies in different years. The wettest year on record was 1903, when the rainfall averaged 50 inches for the whole of England; and the driest year was 1887, when it amounted to no more than 24 inches. The heaviest rainfall in Great Britain is in the mountains round Ben Nevis and Snowdon, in the English Lake District, and in the uplands of Cornwall and Devon. And it may fairly accurately be said that, as we cross England from west to east, the amount of the annual fall steadily decreases, as is shown in the accompanying map. The moisture-laden clouds, driven across the Atlantic by the prevalent S.W. winds, discharge their contents on meeting the cold high lands of western England, which thus act as a sort of umbrella, the driest parts of the country being on the east coast. While the average fall over a considerable part of the west side of it is from 40 to 60 inches, that on the east is no more than from 25 to 30; and round the Wash and in parts of Suffolk and Essex it is under 25 inches. Thus it sometimes happens that when the west of England has rain enough and to spare, the eastern districts are suffering from the want of it. The effect of this difference is shown in a marked degree in the character of the crops. The farms of the rainier west are to a great extent laid down in grass. The drier districts of the east grow more corn, which needs dry weather to ripen it. ENGLAND & WALES ANNUAL RAINFALL The driest month in England generally is March, whose rainfall averages 1·46 inches; and the wettest is October, in which the average amount is 2·81 inches. The pleasant climate of Devonshire, which is highly conducive to health and to extreme longevity, and which, especially in the south, favours luxuriant and even sub-tropical vegetation, owes its character to five main causes;—the fact that the county is bounded on two sides by the sea; the influence of the Gulf Stream or warm ocean current, which directly affects both coasts; the warmth and moisture of the prevailing winds; the shelter afforded to the southern districts by the high ground of Dartmoor; and the large amount of bright sunshine which the county, and especially the south of it, is favoured. It is owing to the Gulf Stream that the temperature of the sea in the English Channel is many degrees higher Upcott Lane, Bideford It is largely the shelter given to it by Dartmoor and the Blackdown Hills that makes the south and south-east of Devonshire so famous for its warm and pleasant climate. The south-west also benefits from the protection The prevailing winds in Devonshire are the west and south-west, which, blowing across the open Atlantic, are also the chief rain-carrying winds. Both are comparatively warm, the latter following the course of the Gulf Stream. But they are often violent, and vegetation fully exposed to them does not flourish. The peninsula of which Devonshire forms a part contains the warmest districts in Great Britain. The annual average temperature of the whole county is 49 ½° Fahr., which is a degree and a half higher than that of the whole of England; while the average for Torquay is 51°. In the three winter months, January, February, and March, in which the average temperature for London is 39·7°, that for Torquay is 41·3°. The annual amount of bright sunshine in Devonshire naturally varies in different years. In 1906 it was nearly 2000 hours on the south coast, and not less than 1800 on the north. The average amount appears, however, to be about 1700 in the south, and 1500 on the north coast, or between three and four hours a day. The actual amount would, of course, be much more than this in summer, and much less in the winter. The amount of rain in Devonshire in 1907, which was an average year throughout the country, was (taking the mean of the 169 stations named in Dr H. R. Mill's British Rainfall) 41·24 inches, falling on 210 days, or about 7 ½ inches and 7 days above the average for the whole of England and Wales. In the same year A feature of Dartmoor even more striking and characteristic than its heavy rainfall is the fog which so frequently covers it, and which is sometimes so dense as to cause the most experienced moor-men to lose their way. Speaking generally, the climate of Devonshire may be described as warm and moist and remarkably equable. The winters are very mild, and snow is rare, except on Dartmoor. On the south coast of the county many plants which in less favoured parts of England need protection in the winter, such, for instance, as geraniums, hydrangeas, heliotropes, and camellias, are left out-of-doors all the year. Magnolias reach to the tops of the houses, myrtles grow to a height of thirty feet or more, palms and Devonshire seems peculiarly liable to seismic disturbances, and many slight shocks of earthquake have been recorded. |
|
