Frost days
Number of days with TN < 0 Celsius.
fd(data, data_names = NULL, time.scale = YEAR, na.rm = FALSE)
data |
daily minimum temperature, Celsius |
data_names |
names of each period of time |
time.scale |
month, season or year |
na.rm |
logical. Should missing values (including NaN) be removed? |
days
Klein Tank AMG, Zwiers FW, Zhang X. 2009. Guidelines on analysis of extremes in a changing climate in support of informed decisions for adaptation, climate data and monitoring WCDMP-No 72, WMO-TD No 1500, p 5.
data(data_all) fd(data=data_all$tn)
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