"Evaporation.—This heat is, of course, to some delicate invalids, very trying, but sun-stroke is almost unknown, and if the head is protected harm is seldom done by exercising even during the hottest portions of the day.
"The temperature by night is almost invariably cool, as seen by the temperature tables, and two blankets at least are grateful to sleep under; while the mornings and evenings being cool, without dew or dampness, give sufficient daylight hours for exercise for those who shun the mid-day heat.
"The rainfall, which, with the melted snow, averages only fifteen inches for the year, occurs almost entirely between the middle of April and the middle of October, and falls chiefly in the three summer months.
"Thunderstorms, or rather showers, occurring in the afternoons and lasting about twenty minutes or half an hour, when much rain will fall at that one time, are the usual form in which the bulk of the precipitation occurs. These storms arise rapidly, are seldom preceded by the warning sense of discomfort that is usually felt in lower regions, and disappear as quickly, leaving a sense of refreshment after the heat, with few and rapidly evaporating signs of moisture upon the soil.
Autumn.
"The autumn is perhaps the most enjoyable season of the year, it is very dry and warm without heat and with few storms. Although there is no reason why patients suited to the climate should not begin their sojourn in any season convenient to them, perhaps September or October are on the whole best, because they then approach the cold nights of winter gradually.
TABLE I.—Mean Temperature.
| At 7 a.m. | At 10 a.m. | At 2 p.m. | At 9 p.m. | [A] Day. | |
| January | 17.8 | 27.3 | 36.0 | 20.9 | 24.4 |
| February | 21.3 | 36.3 | 42.0 | 27.1 | 29.4 |
| March | 31.4 | 46.6 | 52.4 | 37.4 | 36.6 |
| April | 38.9 | 50.8 | 54.7 | 42.2 | 43.9 |
| May | 50.2 | 57.9 | 62.9 | 51.7 | 49.9 |
| June | 61.5 | 66.1 | 72.6 | 60.2 | 65.9 |
| July | 66.2 | 75.2 | 77.6 | 65.0 | 69.7 |
| August | 64.9 | 74.3 | 76.9 | 63.6 | 68.1 |
| September | 50.1 | 60.4 | 68.8 | 54.2 | 57.2 |
| October | 37.9 | 52.0 | 60.6 | 42.7 | 47.8 |
| November | 27.9 | 43.9 | 48.2 | 31.3 | 35.5 |
| December | 20.2 | 22.8 | 38.2 | 23.2 | 27.6 |
| Spring | 40.2 | 51.8 | 56.7 | 43.8 | 42.8 |
| Summer | 64.2 | 71.9 | 75.7 | 62.9 | 67.9 |
| Autumn | 38.6 | 52.1 | 59.2 | 42.7 | 47.1 |
| Winter | 19.8 | 28.8 | 38.7 | 23.7 | 27.1 |
| Year | 40.7 | 51.1 | 57.6 | 43.3 | 46.4 |
[A] The daily mean is one-fourth the sum of the readings at 7 a.m., at 2 p.m., and double the reading at 9 p.m.