The two following tables of a tropical and subtropical station, each on this coast, will give some general conception of the conditions prevailing.
| Zanzibar Island. Lat. circa 7° 30′ S. | ||||||
|---|---|---|---|---|---|---|
| Month | Mean Maximum Temperature | Mean Minimum Temperature | Rainfall | |||
| F. | C. | F. | C. | Ins. | Mm. | |
| January | 86·1 | 30·0 | 79·6 | 26·5 | 3·26 | 82·6 |
| February | 87·0 | 30·6 | 80·3 | 26·8 | 1·51 | 38·3 |
| March | 86·3 | 30·2 | 79·3 | 26·3 | 6·24 | 159·1 |
| April | 84·7 | 29·3 | 77·6 | 25·4 | 11·94 | 303·3 |
| May | 82·4 | 28·0 | 75·6 | 24·3 | 10·23 | 250·2 |
| June | 81·5 | 27·5 | 74·2 | 23·5 | 1·36 | 34·7 |
| July | 80·2 | 26·8 | 72·7 | 22·6 | 2·75 | 69·8 |
| August | 81·8 | 27·0 | 72·7 | 22·6 | 1·68 | 43·0 |
| September | 82·0 | 27·8 | 73·4 | 23·0 | 2·10 | 53·3 |
| October | 83·2 | 28·1 | 75·3 | 24·0 | 3·74 | 95·1 |
| November | 83·7 | 28·7 | 77·1 | 25·1 | 8·23 | 209·1 |
| December | 85·8 | 29·8 | 79·5 | 26·4 | 4·18 | 106·3 |
| Year | 83·6 | 28·7 | 76·4 | 24·6 | 57·25 | 1,454·2 |
| Natal, Durban. Lat. 29° 50′ S.; near Sea-level. (1902.) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Month | Temperature at 9 a.m. | Monthly Maxima | Monthly Minima | Rainfall | Number of Rainy Days | ||||
| F. | C. | F. | C. | F. | C. | Ins. | Mm. | ||
| January | 74·0 | 23·3 | 92·1 | 33·4 | 56·4 | 13·6 | 6·53 | 166·2 | 23 |
| February | 78·2 | 25·7 | 95·2 | 35·1 | 60·5 | 15·8 | 2·09 | 53·2 | 12 |
| March | 74·5 | 23·6 | 93·8 | 34·3 | 59·2 | 15·1 | 10·23 | 256·5 | 20 |
| April | 70·1 | 21·1 | 86·2 | 30·1 | 56·9 | 13·8 | 2·52 | 64·0 | 9 |
| May | 66·5 | 19·2 | 83·5 | 28·6 | 52·0 | 11·1 | 1·21 | 30·6 | 10 |
| June | 61·6 | 16·5 | 78·3 | 25·7 | 47·4 | 8·6 | 0·73 | 18·0 | 3 |
| July | 62·0 | 16·7 | 88·0 | 31·1 | 49·5 | 9·7 | 0·27 | 7·0 | 4 |
| August | 63·5 | 17·5 | 79·0 | 26·1 | 48·4 | 9·2 | 3·90 | 99·1 | 12 |
| September | 67·1 | 19·5 | 105·6 | 40·9 | 51·5 | 10·8 | 2·54 | 64·7 | 13 |
| October | 69·6 | 20·8 | 91·2 | 32·9 | 51·3 | 10·7 | 2·23 | 56·6 | 17 |
| November | 70·9 | 21·6 | 92·3 | 33·5 | 57·1 | 13·9 | 5·15 | 130·8 | 19 |
| December | 75·2 | 24·0 | 91·4 | 33·1 | 58·2 | 14·5 | 3·96 | 100·4 | 18 |
| Year | 69·4 | 20·8 | 105·6 | 40·9 | 47·4 | 8·6 | 41·18 | 1,047·0 | 160 |
Madagascar.
—With the exception of the littoral, which is rather warm and extremely malarious, the greater part of this island is too elevated to present a really hot climate, but the rainfall in the interior is rather heavier than on the mainland, that of the capital, Antananarivo, being 52·4 ins. (1,331 mm.), which is distributed as follows:—
| Monthly Rainfall of Antananarivo. E.F., 4,850; E.M., 1,478. | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. | Feb. | March | April | May | June | July | Aug. | Sept. | Oct. | Nov. | Dec. | |
| Ins. | 11·54 | 9·28 | 7·36 | 2·00 | 0·71 | 0·33 | 0·20 | 0·28 | 3·18 | 3·51 | 5·25 | 11·0 |
| Mm. | 294 | 236 | 187 | 51 | 18 | 8 | 5 | 7 | 17 | 89 | 133 | 280 |
The Island of Mauritius.
—Latitude circa 20° 20′ S. The mean annual temperature of Port Louis is 77·2° F. (25·1° C.), the absolute extremes of temperature in nineteen years being 89° and 53·5° F. (31·6° and 11·9° C.), and the mean relative humidity 74 per cent., so that in the matter of heat there is nothing to be feared; but unfortunately malaria, which was quite unknown in the earlier days of its colonisation, is now very rife and of a very obstinate type. The rainfall amounts to 74·5 ins. (1,892 mm.), which is rather heavier than that of Madagascar, and is distributed as below:—
| Monthly Rainfall of Port Louis, Mauritius; near Sea-level. | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. | Feb. | March | April | May | June | July | Aug. | Sept. | Oct. | Nov. | Dec. | |
| Ins. | 11·55 | 8·18 | 11·35 | 9·14 | 5·73 | 4·65 | 4·25 | 3·86 | 2·71 | 2·64 | 3·24 | 6·98 |
| Mm. | 293 | 208 | 288 | 232 | 145 | 118 | 108 | 98 | 69 | 67 | 82 | 177 |
The southernmost portions of Africa, Cape Colony, &c., do not belong to the category of hot climates, either in climate or in their diseases, and so need not be considered here.