MARYLAND WEATHER SERVICE 



39 



Date of Last Minimum Temperature of 32° in Spring; and of 

 First Minimum Temperature of 32° in Autumn. 



Last in Spring. First in Autumn. Length of 



(Average Date) (Average Date) Interval 



1893-1903. 1893-1903. in Days. 



Sunnyside, May 16th, September 15th, 122 



Boettcherville, April 26th, October 4th, 161 



Green Spring Furnace, April 20th, October 12th, 175 



Frederick, April 10th, October 25th, 198 



Baltimore, April 4th, November 14th, 224 



Easton, April 10th, November 2nd, 206 



Pocomoke City, April 16th, November 7th, 205 



Date of Last Minimum Temperature of 40° in Spring ; and op 

 First Minimum Temperature of 40° in Autumn. 



These figures show a marked contrast between the extreme sta- 

 tions in Garrett and Worcester counties, a difference of 83 days in 

 the first case and 115 days in the second, — a mean difference of 

 ihree months. That the figures show Baltimore to have a longer 

 growing season than Easton or Pocomoke City is contrary to the 

 evidence of the vegetation as repeatedly observed by the writer, and 

 is doubtless due to the instruments at the Baltimore station being 

 exposed in the midst of a large city. It is particularly noticeable 

 that in the case of Pocomoke City the average date of the last occur- 

 rence of 40° is only 9 clays after the average date of the last occur- 

 rence of 32°, while for Sunnyside the former date comes 50 days 

 after the latter. This indicates a rapid oncoming of spring at Poco- 

 moke City, with warm nights, and a long persistence of cool nights 



