[R] montly mean temp plot

[ms.com]

Dear all
i got a problem in monthly mean temperature. here i am attaching the data set as well as the plot i got with the following command
plot(month,type='n')
plot(month,X1999)

this command gave the plot where the month names are in alphabetic order, i want the plot in monthly sequence
could you please suggest me how can i solve my problem?

thanking you

regard
madan

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