Re: [gardeners] Annual rainfall

olin (
Sun, 5 Jan 2003 21:25:58 -0700

Actually, the official total at the Phoenix Encanto site was 4.18 inches in
2002.  Yuma county's annual ranged all the way from 0.04 to 0.20 inches.
Check the sites at
You need to add up the monthly totals to get the annual total.

I once ran a least squares trend line using the raw data to see if we are
really drying up.  A snapshot of the most recent 10 year period shows a
negative slope of about 0.4 inches per year for my area which suggests a
decline to zero inches in about 20 years.  Pretty scary.
But if I consider all of the data on record, then toss out the years that
were 40 % above the average and 40 % below the average, the trend line is
pretty flat.   Suggests any predictions from statistical data need to be


----- Original Message ----- From: "GizmoAZ" <>
> Quite amazing compared to our 7 inches of average rainfall per year.  We
> would be floating away if we had 21.45 inches of rain in one month.  The
> ground here doesn't seem able to soak it in that fast.