Hi.
Is the rainfall data regular (every day) or sporadic.
If sporadic, is the amount of rainfall cumulative since the previous date.
I also take it that you want 2 outputs. The total amount of rainfall
over the desired period and the number of data points on which rainfall
was recorded over that period.
Steve
On 08/05/17 07:55, Hylton Conacher (ZR1HPC) wrote:
Hi,
I have a spreadsheet I use to draw graphs and extract information
about the rainfall in my area for the last two years.
I need to create a formula that will count how many days it rained
between the start of the year, both last year and this year, so I can
compare the amount of rainfall that was received during that time frame.
The example below is a sample dataset that shows how much rainfall was
received in 2016 or 2017, on each of the four days
Example:
Month Day 2016 2017
Jan 1 0 15
Feb 29 1 0
May 6 0 1
Sept 22 15 5
From this we can determine that 16mm of rain fell in 2016 over 2 days.
Likewise we can determine that 21mm of rain fell in 2017 but over 3 days.
Today is the 7th of May 2017 and I would like a formula to work out
how many days the rainfall received between(and incl) 2016/01/01 and
the day before TODAY last year. The answer for 2016 is 1 i.e. it only
rained once between the dates specified, however the answer for 2017
is 16 as it rained twice between TODAY-1 and 2017/1/1. I had thought
of using COUNTIF or DAYS or =COUNTIF(C2:SUM(TODAY()-1,">0")), however
the problem is that I do not have a single date column, but three.
This formula will allow me to create a graph showing how much rainfall
had fallen last year compared to this year between the beginning of
the year(01/01) and the day prior to Today.
I had thought of converting the first two columns into a single and
having the text name of the month with each successive line being a
new date in that month until the month changed, however I was unable
to get it to work i.e. automatically change month after 31 days in
January to read February 01.
As you can imagine I have 367 rows of data per year, mostly with 0 as
a value, however there are odd days it does rain.
Any comments, and if you want the original spreadsheet, just yell
where to put it i.e. Nabble etc.
Regards
Hylton
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