+----+----+----+----+-----+----+----+----+ | | | | | | | | | |Year|June|July|Aug.|Sept.|Oct.|Nov.|Dec.| | | | | | | | | | +----+----+----+----+-----+----+----+----+ |1900| | | | | | | | | | | | | | | | | |1901| | | | | | | | | | | | | | | | | |1902| | | 1.8| |46.4|11.0| | | | | | | | | | | |1903| | | | | |30.6|50.0| | | | | | | | | | |1904| | | | | 9.0| 4.0| 2.0| | | | | | | | | | |1905| | | | | | | | | | | | | | | | | |1906| | 4.0|80.0| 41.0|80.0| | | | | | | | | | | | |1907|20.0| | | 5.0| 3.3| 3.8| 1.3| +----+----+----+----+-----+----+----+----+ The seasonal distribution of rainfall at four desert stations shows also marked irregularities. The distribution (in percentages) is given in table 3. TABLE 3.—_Seasonal distribution, in percentages, of rain._ +----------+---------+---------+---------+---------+ | Station. | Winter. | Spring. | Summer. | Autumn. | +----------+---------+---------+---------+---------+ |Ouargla | 37 | 39 | 4 | 20 | |Laghouat | 11 | 27 | 31 | 31 | |Ghardaia | 15 | 23 | 13 | 49 | |Touggourt | 13 | 30 | 3 | 53 | +----------+---------+---------+---------+---------+ The relative humidity at the desert stations is often very low, sometimes running in midsummer between 7 and 9 per cent for 6 days, and occasionally being too low to measure with the instruments employed. The mean relative humidity (table 4) shows the general very dry condition of the air of the desert as contrasted with a station in the Tell, and also indicates something of the monthly variations in this factor experienced among the desert stations themselves. The averages given are from 4 to 8 years, except the mean annual for In Salah, which is for 2 years only. TABLE 4.—_Mean relative humidity, in percentages._ +--------------+------+------+------+------+------+------+------+ | Station. | Jan. | Feb. | Mar. | Apr. | May | June | July | +--------------+------+------+------+------+------+------+------+ | Ouargla | 61.0 | 58.6 | 60.3 | 51.2 | 52.0 | 49.0 | 44.1 | | El Golea | 60.8 | 56.8 | 41.3 | 41.3 | 41.0 | 31.3 | 28.5 | | In Salah | 51.5 | 48.0 | 45.5 | 40.4 | 34.6 | 32.0 | 23.4 | | Ft. National | 87.4 | 80.3 | 87.6 | 86.6 | 96.6 | 80.4 | 75.8 | +--------------+------+------+------+------+------+------+------+ [**Continued]