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what's up doc thanks for the contribution there doc... I think I have the logic figured out now: assuming a horizontal cutoff and no upper threshold...i think i have 3 possible scenarios: 1)Tmax & Tmin < base temp (low threshold)-> # DD = 0 2)Tmax & Tmin >= base temp-> #DD =...

woohoo single sine Hey Alex, thanks for the heads up; the pdf by zalom et al has exactly what i'm looking for... formulae for doing the calculations. However, now my next major stumbling block is what to use for the lower threshold values when calculating degree days below 2 selected...

functions/formulae for sine calculating degree-days isn't this ironic...I'm looking to calculate degree-days within access via the single sine method with a horizontal cutoff....where I can simply specify different thresholds as parameters... but being an access newbie i have NO idea...