[R-sig-Geo] Plotting probability exceedance

[r@i@1290 m@iii@g oii @im@com]

Hi there,
I have climate data pertaining to extreme precipitation, as well as carbon emissions associated with those precipitation values in a dataframe. 
The goal of my analysis would be to determine the probability of exceeding specific thresholds of precipitation extremes, as well as showing this graphically (I am imagining this by placing extreme precipitation on the the x-axis and exceedance probabilities on the y-axis).
My question is if anyone has an idea how to approach this, or a good starting place? I have looked online, but there is nothing specific to really draw on.
Thank you for your time, and I look forward to your response!
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