Climate of Middle Illinois. 17 



est August 1866^70; the warmest June in 1873=79; the warmest July 

 1868=82.7; the warmest August 1881=80.5. 



The mean temperature of the decades was of June 1st decade=70; 

 2d=73; 3d=77; of July lst=77.9; 2d=78.3; 3d=77.2; of August lst= 

 77; 2d=75.6; 3d=73.3. 



The coolest decade of June was the 1st of 1863^=63; July the 2d in 

 1865=65.3; of August the 3d in 1863=65.3; the warmest in June the 3d 

 in 1858=85; in July the 2d in 1878=89.8; in August the 1st in 1861=86.7. 



Of the single observations the highest for June was on the 24th, in 

 1856=100; for July on the 15th, 1859, on the 4th, 1874, and on the 30th, 

 1885=104; for August on the 31st in 1873=105; the lowest for June on 

 the 4th 1859=35; for July on the 2d, in 1861, and the 16th, in 1863=50; 

 for August on the 29th, in 1863=41. 



FALL. 



The mean temperature of the three fall months is 53.3. 



The coolest fall was in 1880=48.9; the warmest in 1884=55.1; the 

 coolest September was in 1866=60.5; the warmest in 1865=73.1; the 

 coolest October in 1869=48.2; the warmest in 1879=62.7; the coolest 

 November in 1880=30.2; the warmest in 1867=44.4. 



The mean temperature of the decades are the following: For Septem- 

 ber lst=70.8; 2d=66.4; 3d=63. For October lst=59.7; 2d=53.5; 3d 

 48.5. For November lst=45.5; 2d=38.8; 3d=33.9. 



The coolest decade in September was the 3d in 1856=52.7. The 

 warmest the 1st in 1884=81.3. The coolest in October the 3d in 1869= 

 36.3. The warmest the 1st in 1879=76.3. The coolest in November the 

 3d in 1880=20.3. The warmest the 1st in 1874=54.5. 



The highest stand of the thermometer was observed on the 3d of 

 September, 1864, and on the 5th of September, 1881=98; on the 3d of 

 October, 1856, on the 12th of October, 1879, and on the 8th of October^ 

 1884=90; on the 7th of November, 1874=77. The lowest on the 29th of 

 September, 1871=34; on the 24th of October, 1869=14, and on the 23d of 

 November, 1857=«15. 



By comparison of the temperatures of different places in Illinois dur- 

 ing the meteorogical year, December 1869 to November 1870, we find in 

 the mean temperature of Peoria and Springfield which is nearly a degree 

 farther south, and Ottawa which is more than half a degree farther north, 

 scarcely any difference, but Galesburg farther west and on a higher eleva- 

 tion had, that same year, a mean of one degree lower and a January very 

 much colder. Of the same year the temperatures of Steubenville, Ohio, 

 Fort Madison on the Mississippi, and Nebraska City on the Missouri, all 

 nearly in tbe same latitude with Peoria, as compared, show the following 

 figures: 



3 



