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Sum of degree days when TN <= -15 Celsius recorded in December-February interval
stn15(data, data_names = NULL, na.rm = FALSE, ...)
minimum temperature
names of each period of time
logical. Should missing values (including NaN) be removed?
...
temperature sums 2
# NOT RUN { data(data_all) stn15(data = data_all$tn) # }
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