1874 San Diego City Directory
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CITY OF SAN DIEGO.
United States. The entire number of degrees range of the thermometer in the several months, commencing with January, was only 32, 40, 32, 40, 23, 17, 17, 15, 27, 27, 36, and 231.
But the uniformity of temperature in San Diego, unparalleled elsewhere, is more fully shown by the observations taken at three different hours each day. By those taken at five minutes before five o'clock in the morning, the mean number of degrees for each month was its follows: for January, 51; February, 48; March, 52; April, 52; May, 56; June, 59; July, 63; August, 65; September, 67; October, 57; November, 56; December, 49. It thus appears that, at this hour of the day, the difference between the heat of one month and that of the month following was once, nothing; once, only one degree; twice, two degrees; twice three degrees; three times, four degrees; only once, seven degrees; and only once, ten degrees.
The second time of observation was in the early part of the afternoon - at five minutes before two o'clock. It is then when we look for the mercury to reach its greatest height. The sun is nearly over us, and he has been imparting heat to the earth during all the morning and noon. Now what do the official records show in regard to this hottest portion of the day? The mean of the daily observations in January was 64; in February, 59; March, 62; April, 65; May, 65; June, 67; July, 74; August, 74; September, 70; October, 68; November, 66; December, 60. The monthly means of the daily observations taken at twenty minutes after eight o'clock in the evening were, for the several months respectively, beginning with January, 55, 53, 56, 57, 50, 62, 64, 68, 66, 61, 59, 54.
In addition to these monthly means, we might present the daily observations themselves, which show that not only the mean temperature of any one month at a given hour is very nearly the same as that of every other month at the same hour, but also that the several days during each month scarcely differ in temperature one from the other. But such an exhibit for the whole year would make the present article too long; go we give only the afternoon observations during June and December, these months being fair samples
