---------+------------------------+------------+---------+---------- | Temperature in C.° |Evaporation.|Humidity.|Atm’sph’ic | | | | Pressure. +------------------------+------------+---------+---------- | Max. | Min. |Average.| Average. | Average.| Average | | | | | | in mm. ---------+-------+-------+--------+------------+---------+---------- | | | | Per cent. | January | 29.5 | 13.1 | 19.25 | 30.77 | 78 | 665.53 February | 31.9 | 8.2 | 19.78 | 44.89 | 70 | 666.52 March | 31.7 | 10.9 | 20.51 | 36.68 | 72 | 665.70 April | 32.7 | 12.2 | 21.02 | 36.80 | 74 | 665.59 May | 30.3 | 14.0 | 20.52 | 24.29 | 82 | 665.52 June | 29.3 | 15.5 | 20.40 | 16.40 | 85 | 665.32 ---------+-------+-------+--------+------------+---------+---------- The average atmospheric pressure of San José, the capital of the country, is 665.21 mm. The maximum occurs regularly during the months from October to March inclusive, at nine o’clock a. m., and during the rest of the year at eleven o’clock p. m. The minimum occurs always in the afternoon at four o’clock during the first eight months of the year, and at three o’clock during the last four months. The prevailing wind is from the northeast, or, better, north-northeast and east. During August, September and October an increase of the northwest winds causes the heavy rains of that season. West-northwest and northwest winds blow also from May to August. The daily variation of winds is generally as follows: At seven a. m. the most frequent winds blow from S. E., to N. E.; at ten o’clock a. m. from E. to N. N. E; at one o’clock and at four o’clock p. m. from E. N. E. to N.; from seven o’clock p. m. the movement is retrograde. The velocity is least from seven to ten o’clock a. m., and most from one to four o’clock p. m. In 1889, during the time of observations at San José, there were noted 13 hours of north winds, 186 N. N. E., 571 N. E., 227 E. N. E., 93 E., 58 E. S. E., 25 S. E., 6 S. S. E., S. none, S. S. W. none, 1 S. W., 3 W. S. W., 4 W., 83 W. N. W. The number of calms is small. The wind is nearly always moderate, but during the dry season the dust whirled up in the cities is very disagreeable. The climate of the uplands is an eternal spring.