Fig. 102—Monthly rainfall of Santa Lucia for the year November, 1913, to October, 1914. No rain fell in July and August.
Fig. 103A—Maximum, mean and minimum monthly rainfall of Caylloma for the period 1896-7 to 1902-3. July was absolutely rainless. Caylloma is situated immediately east of the crest of the Maritime Cordillera in a position similar to that of Santa Lucia (see [Fig. 66]).
Fig. 103B—Annual rainfall of Caylloma for the periods 1896-7 to 1902-3; 1903-4 to 1910-11 and for 1915-6 (incomplete: May and June, months of low rainfall, are missing). Means for the respective seven and eight year periods are shown and the rainfall of Santa Lucia for the single observation year is inserted for comparison.
| RAINFALL, SANTA LUCIA, NOV. 1913 TO OCT. 1914 | ||||
| No of fine days | No. of rainy days | Max. for single day | Total rainfall in inches | |
| November | 9 | 21 | 1.150 | 4.264[34] |
| December | 16 | 15 | .700 | 6.439 |
| January | 17 | 14 | .610 | 3.313 |
| February | 9 | 17 | .910 | 2.975 |
| March | 11 | 20 | 1.102 | 4.381 |
| April | 17 | 13 | 0.31 | 0.92 |
| May | 8 | 23 | 0.35 | 1.63 |
| June | 27 | 3 | 0.05 | 0.07 |
| July | 31 | 0 | 0.00 | 0.00 |
| August | 31 | 0 | 0.00 | 0.00 |
| September | 23 | 7 | 0.05 | 0.35 |
| October | 21 | 10 | 0.14 | 0.56 |
| Total | 24.902 | |||
WIND
An analysis of the wind at Santa Lucia shows an excess of north and south winds over those of all other directions. The wind-rose for the entire period of observation ([Fig. 104]) clearly expresses this fact. When this element is removed we observe a strongly seasonal distribution of the wind. The winter is the time of north and south winds. In summer the winds are chiefly from the northeast or the southwest. Among single months, August and February show this fact clearly as well as the less decisive character of the summer (February) wind.
The mean wind velocity for the month of February was 540 meters per minute for the morning and 470 meters per minute for the afternoon. The higher morning rate, an unusual feature of the weather of high stations, or indeed of wind-phenomena in general, is due, however, to exceptional changes in wind strength on two days of the month, the 16th and 25th, when the velocity decreased from a little less than a thousand meters per minute in the morning to 4 and 152 meters respectively in the afternoon. More typical is the March record for 1914 at Santa Lucia, when the wind was always stronger in the afternoon than in the morning, their ratios being 550 to 510.
