An R plot is not displayed completely using circular R package

I have circular data of wind direction in radians. Here we have part of November directions at 10 meters:

 nov<-c(5.4977871, 5.4977871, 5.4977871 ,5.4977871, 5.4977871 ,5.4977871, 5.4977871, 5.1050881, 5.4977871, 5.4977871, 5.8904862, 5.8904862 ,6.2831853,5.8904862, 5.8904862, 5.8904862, 6.2831853, 5.8904862, 5.8904862, 5.8904862, 5.8904862, 5.8904862, 5.8904862, 5.8904862, 5.8904862, 5.8904862)

I have plotted time series and a rose diagram, both for wind direction. This is the code:

library(circular)
par(mfrow = c(2, 1))  
ts.plot(nov, xlab="Hour", ylab="radians",main="Time series of wind direction") 
rose.diag(nov[-c(100:713)],bins=18, main="Rose Diagram",) 

As you can see there is a problem on bottom, in 3pi/2. The "2" is not displayed completely. I have done rose diagram based in ggplot2 but I need to conserve this kind of plot. CirStats package have a similar plot but in degrees. Is there a solution?

The clipping on the rose diagram is very dependent on how big my graphics window is. I can make my plot like yours if I shrink my default-sized graphics window. I can make it look okay if I use a larger window.

Where's the final destination for this plot? If a PDF then you might not have a problem with it in that form.

Changing the character size with the cex parameter may help:

par(mfrow = c(2, 1))  
ts.plot(nov, xlab="Hour", ylab="radians",main="Time series of wind direction") 
rose.diag(nov[-c(100:713)],bins=18, main="Rose Diagram",cex=0.5) 

gives me smaller text labels that fit better. But its still a bit ugly, and the text can clash with the circle and the tick marks.