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Actual vapor pressure estimation when RH is not present in data #85

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Actual vapor pressure estimation when RH is not present in data #85

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597e856
Update meteo_utils.py
aldotapia Aug 19, 2025
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aldotapia Aug 19, 2025
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10 changes: 6 additions & 4 deletions pyet/meteo_utils.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,4 @@
"""The meteo_utils module contains utility functions for meteorological data.

"""
"""The meteo_utils module contains utility functions for meteorological data."""

from numpy import cos, exp, isnan, log, pi, sin, tan
from pandas import Series, to_numeric
Expand Down Expand Up @@ -264,7 +262,11 @@ def calc_ea(tmean=None, tmax=None, tmin=None, rhmax=None, rhmin=None, rh=None, e
es = calc_es(tmax=tmax, tmin=tmin)
else:
es = calc_e0(tmean)
return rh / 100 * es
if rh is None and tmin is not None:
ea = calc_e0(tmin) # assuming Tdew close to Tmin, Allen 1998
else:
ea = rh / 100 * es
return ea


def day_of_year(tindex):
Expand Down
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