我有一个数据框,里面有日平均温度数据,结构如下:
'data.frame': 4666 obs. of 6 variables:
$ Site : chr "EB" "FFCE" "IB" "FFCE" ...
$ Date : Date, format: "2013-01-01" "2013-01-01" "2013-01-01" "2014-01-01" ...
$ Day : int 1 1 1 1 1 1 1 1 1 1 ...
$ Year : int 2013 2013 2013 2014 2014 2014 2014 2015 2015 2015 ...
$ Month: int 1 1 1 1 1 1 1 1 1 1 ...
$ Temp : num 28.5 28.3 28.3 27 27.8 ... …