positive degree day for normally distributed temperatures

Version 1.0.0.0 (886 Bytes) by Aslak Grinsted
expected positive degree days per day
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Updated 22 Aug 2014

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PDD fraction in a normally distributed climate

Calculates the probability weighted positive degree days for normally distributed temperatures:
fPDD=int(normpdf(T,Tmu,sigma)*T,'T',0,inf)

Usage:
fPDD=normalpdd(Tmu,sigma)

Example:
T_june = 3; %degC
sigma_june = 7; %degC =std(daily_average_temps_june)
PDD_june=30*normalpdd(T_june,sigma_june) % units: degC*days
PDD_factor = 8e-3 %m/day/degC <- different factors exist in litterature.
melt_june = PDD_factor*PDD_june % meters of melt.

reference: Braithwaite 1985.

Aslak Grinsted 2012

Cite As

Aslak Grinsted (2025). positive degree day for normally distributed temperatures (https://www.mathworks.com/matlabcentral/fileexchange/47624-positive-degree-day-for-normally-distributed-temperatures), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2012a
Compatible with any release
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Version Published Release Notes
1.0.0.0