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Calculating seasonal mean of precipitation from 25 years daily data

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tshering lhamo 2020-9-25

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评论： Jesper Sam 2020-11-16

采纳的回答： Ameer Hamza

Hello,

I have precipitation data for 25 years in excel. My data is arranged like this: year(column 1), month(column 2), day(column 3), precipitation(column 4). how can i calculate seasonal mean from this data please?

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Ameer Hamza 2020-9-25

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See retime(): https://www.mathworks.com/help/matlab/ref/timetable.retime.html

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tshering lhamo 2020-9-26

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Thank you! i have used retime to calculate the monthly and yearly means but im lost when it comes to seasonal mean. Im still a beginner in MATLAB. Can you please help me how to go about with seasonal calculation.

This is the code i used for the monthly and yearly means:

Time=datetime(stationdat(:,1),stationdat(:,2),stationdat(:,3));
precip=stationdat(:,4);
TT=timetable(Time,precip);
TT_mth=retime(TT,'monthly','mean');
TT_yr=retime(TT,'yearly','mean');

Ameer Hamza 2020-9-26

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How do you define seasons? Can you tell the range of months each season last?

tshering lhamo 2020-9-26

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december, january, feb would be winter months. march,april,may-spring; june,july,august- summer : sept,oct,nov-autumn

tshering lhamo 2020-9-26

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the data starts from 1st jan 1996- 29th febuary, 2020

Ameer Hamza 2020-9-26

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You can also pass the new time vector to the retime. In the new time vector, specify the months at which you want values. Following start from January, then add March and then add intervals of 3 months.

t = datetime(2000, 1, 1):calmonths(1):datetime(2001, 12, 1);
t_new = [datetime(2000, 1, 1) datetime(2000, 3, 1):calmonths(3):datetime(2001, 12, 1)]; % start from March
T = timetable(t.', (1:24).');
T_new = retime(T, t_new);

tshering lhamo 2020-9-26

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this would give me values of each season of every year is it correct? is it possible to get the seasonal values of all 25 years together? such that the end result has only 4 mean values(one for each season)

Ameer Hamza 2020-9-26

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Can you attach a sample dataset in a .mat file. It will be easier to suggest a solution.

tshering lhamo 2020-9-26

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precipitation.mat

this is my dataset and thank you!

Ameer Hamza 2020-9-26

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I am not able to load this file. This seems to be some issue in creation of this file.

tshering lhamo 2020-9-27

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precipitation.mat

i have reattached the data file, this should work

Ameer Hamza 2020-9-27

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If you want just for values for mean across all the years, then the following will work

seasons = {[12 1 2], [3 4 5], [6 7 8], [9 10 11]};
mean_values = zeros(size(seasons));
for i = 1:numel(seasons)
    idx = ismember(month1, seasons{i});
    mean_values(i) = mean(prcp(idx));
end

tshering lhamo 2020-9-27

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thank you very much!

Ameer Hamza 2020-9-27

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I am glad to be of help!

Jesper Sam 2020-11-16

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Thanks please all this discussion and code are very helpful. I have monthly data 1981 to 2016, i want seasonal values

Can you please help me to how to write a code in such a way that i get mean of seasons like this; first col is mean avalue for 3 month and the second col of mean values of next three months

Thanks

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Calculating seasonal mean of precipitation from 25 years daily data

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