Built-in Time Series Functions
The analysis is simpler, and the graphics are better labelled, if we convert the temperature data into a regular time series object using ts. We need to specify the first date (January 1987) as start=c(1987,1), and the number of data points per year as frequency=365.
high<-ts(upper,start=c(1987,1),frequency=365)
Now use plot to see a plot of the time series, correctly labelled by years:
plot(high)
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