17 



Table showing the. average temperature and fall of rain (in inches and tenths) 

 for the month of October, for each of the years named, and for the five years 

 first named collectively, ivith the average number of places i?i each State in 

 which the observations were made. 



I 



In the middle of October a marked rise of temperature, followed by a de- 

 pression, occurred similar to that mentioned in the previous report for the mid- 

 dle of September. The rise, as usual, was accompanied with a wind from the 

 southern quarter of the horizon, which prevailed over nearly the whole extent 

 of country from the western prairies to the seaboard. The depression in tem- 

 perature was coincident with a wind from a westerly direction. The occurrence 

 of the change was nearly simultaneous at all the places of observation ; at least 

 the difference in time was not as clearly marked as in some other instances of change 

 of temperature in which a progression from west to east was clearly manifest. 



In addition to the information given in the last report relative to the change 

 in temperature about the middle of September, we have received -a register of 

 the weather from Fort Laramie, near the foot of the Rocky mountains, from 

 which it appears that the same oscillations of the temperature occurred at that 

 distant post ; the time, however, as in many other cases, being a little in advance 

 of that at stations in the eastern part of the country. 



THE DRY SE.\SO>r. 



Mr. Dille, one of our meteorological observers, residing at NeAvark, Ohio, 

 informs us that " the present summer (1863) has been an unusual one. The rain 

 usually conies Mith the southwest wind, but this season the only winds which 



