222 ROCHESTER ACADEMY OF SCIEN'CE. [April I4, 



Comparing temperatures of this place with places on nearly the 

 same latitude east and west, with some departures on account of the 

 interest attaching to special stations, we find as follows : 



In a report issued by the Weather Bureau in 1S91 the highest 

 temperature is given as 121", at Yuma on September 8, 1886, and 

 the lowest as -55°, at Havre on March 2, 1887. 



Considering the temperatures at Rochester, without comparison, 

 we find the maximum or highest day temperatures to average 56° for 

 twenty-five years. The average is 51° for spring, 78° for summer, 

 60" for autumn and 33° for winter. The highest average for any ten 

 days is 87° for the ten days ending September 16, 1892, and the lowest 

 12° for the ten days ending F~ebruary 13, 1875. The highest average 

 for thirty days is 83° for the thirty days ending August 17, 1892, 

 and the lowest 20° for the thirty days ending February 23, 1895. 

 The highest for any day was 99° on July 20, 1894, and the lowest 

 maximum or coldest day, as distinguished from the night tempera- 

 ture or the average for the day and night, was 2" below zero on 

 February 11, 1893. 



The average of minimum or lowest night temperatures is 39" for 

 the year, 35" for the spring, 59" for the summer, 44" for the 

 autumn and 19" for the winter. The highest average for any ten 

 nights is 68° for the ten nights ending July 18, 1876, and the lowest 

 -4" for the ten nights ending February 13, 1875 ; the 30 warmest 

 nights 66" ended July 28, 1887, and the coldest 30 nights 3" ended 

 February 23, 1885. The highest daily minimum or warmest night 

 occurred July 18, 1878, 76", and the coldest had a record of -12° 

 January 30, 1873, and February 13, 1875. The average yearly tem- 

 perature, as given heretofore, is 47° ; the mean temperature for the 

 spring is 39", at Omaha it is 41" ; the mean temperature for the 



