( 300 ) 



a. the common mean monthly temperatures; 



A. the means for the periods May Hi' 1 ' June 15"' etc.; 



c. the numbers of summerdays for calendarmonths; 



d. the number of summerdays for the periods May lb lh — Junel5 th etc. 



GRONINGEN 188-1—1905, 



Period 



June 



July 



Aug. 



Sept. 



1891- 

 1896- 

 1901 - 



1891- 



1896 



I9;H 



1891- 



1896- 



1001- 



1891- 

 I8U6- 

 1901- 



a. Mean temperatures for calendarmotuhs 

 -1895 I - 3 — 13 I — 5 

 -1900 7 12 i — (i 



-1905 I —4 1 11 



b. Mean temperatures May 16 th — June 15 th etc. 



-!895 

 -1900 

 1905 



-1895 

 -i900 



-l90r» 



— 'i 



-58 



3 



-2 I 



7 

 id 8 



—5 3 | 11 2 19 3 



c. Summerdays calendarmonths. 

 —3 — 11 -5 —12 —28 l 



7 14 —6 CI 10 2 



—A -2 II el 19 —3 



rf. Summerdays May 16"' —June In' 11 etc. 



-1895 

 -1900 

 -1105 



5 3 



'2 —7 



-7 5 



5 2 



2 - S 



First regarding only the signs, we find; 



concordances discrepancies 



6 



8 

 10 



Undecided 



