. Cranberries; : the national cranberry magazine. Cranberries. Sj)ring Minimum Temperature Continued from page 7 scale do not exist. However, probability of the last thres- hold low temperature on a macroclimatic scale for some stations in New Jersey has been analyzed by Havens and Mc- Guire.' Thirty years of shelter mini- mum (five-foot level) tempera- tures were analyzed to deter- nnine: (a) the date and its associa- ted probability of the last spring 32 degrees F, 28 degrees F, and 24 de- grees F or lower, (b) the expected number of critical low temperatures after a certain drainage date. S
. Cranberries; : the national cranberry magazine. Cranberries. Sj)ring Minimum Temperature Continued from page 7 scale do not exist. However, probability of the last thres- hold low temperature on a macroclimatic scale for some stations in New Jersey has been analyzed by Havens and Mc- Guire.' Thirty years of shelter mini- mum (five-foot level) tempera- tures were analyzed to deter- nnine: (a) the date and its associa- ted probability of the last spring 32 degrees F, 28 degrees F, and 24 de- grees F or lower, (b) the expected number of critical low temperatures after a certain drainage date. Seven stations -encompassing the cranberry bog area were uti- lized to answer (a) above. These included Indian Mills, Pleasantville, Pemberton, Tuc- erton, Belleplain, Freehold, and Hammonton. Only one station, Pemberton, was used to an- swer question (b). Pemberton was selected because of the length of its continuous record and because of its compatibility with Whitesbog, New Jersey, the bog which is frequently used by growers as a "reference" bog. Whitesbog is also a lo- cation where bog temperatures are observed in addition to standard instrument shelter temperatures. The microcli- matic variation in cranberry fields is large. Unfortimately, except for Whitesbog, stand- ardized observation of tlie bog surface has not been recorded, but, as indicated earlier, grow- ers in New Jersey have been able to refer to Whitesbog and make necessary corrections ap- plicable to their bogs. Figure 1 shows the average date of the last spring 32 de- grees F (or lower) tempera- tures. This average date means that in the thirty years of ree- Eight ord, 32 degrees F or lower oc- curred prior to the specifitKl date in fifteen out of the thirty years. Several other sites (dates in parentheses) with less than thirty years were also used as a guide to draw the isolines on the map. In general, the aver- age date in the cranberry fields occurs between April 20 thru April 30 in South Jersey.
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