56 



WEATHER IN CRANBERRY CULTURE 



Table 8. — Correlation of Cranberry Frost Occurrence With Mean 

 Temperatures of the Previous January to April, Inclusive. 



* Climatological Data, Michigan Section, published monthly by the office of the U. S. Weather 

 Bureau at Lansing and available to subscribers at little cost, gives the monthly mean temperature 

 and its departure from normal there regularly. 



** Nearly all the dates before 1912 are based entirely on the records of observations at Middle- 

 boro. Since 1911 they are from the experiment station records of observations made at the several 

 cranberry observing stations (p. 37) and are therefore much more inclusive and exact. See page 

 59 for definitions of frost night. 



*** Mostly observations made at Whitesbog. 



