Note 29 — XI Certain Features of Certain Cities
Reading edition
It is to this wind, the temperature of which varies little all the year round, that San Francisco owes her wonderfully equable climate, which is never either too hot or too cold for comfortable work or play. The mean annual temperature is about 57° Fahr., or rather higher than that of New York; but while the difference between the mean of the months is 40° at the latter city, it is about 10° only at the Golden Gate. The mean of July is about 60°, that of January about 50°. September is a shade warmer than July. Observations extending over 30 years show that the freezing point on the one hand and 80° Fahr. on the other are reached on an average only about half a dozen times a year. The hottest day of the year is more likely to occur in September than any other month.