584 METEOROLOGICAL OBSERVATIONS. 



Summary of Barometric and Temperature Observations at Fort Benton. 



Means of temperatur.e spring, 49.89 ; summer, 72.78 ; autumn, 46.85 ; winter, 28.38 ; year, 48.72. 

 Altitude of Fort Benton from these observations, 2662.9 feet. 



* For the last seven days only. 



f In part, several rains not measured. 



JTwo days on which rain fell. 



|| Four days on which rain fell. 



Mean for September assumed at 68. See remarks for notice of the peculiar temperatures of the season*. 



