D = load('matlab.mat');
Temperature = D.Temperature;
ys = smoothdata( Temperature, 'movmean', 100); % R2017a
figure
plot(Temperature, '-b')
hold on
plot(ys, '-r')
hold off
grid
That appears to work well.
EDIT — (24 Apr 2020 at 16:55)
If you have an earlier version/release, this works about as well:
N = 15;
ys = filter(ones(1,N), N, Temperature - Temperature(1), zeros(1,N-1)) + Temperature(1);
Use those two assignments instead of smoothdata.
