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Pan evaporation data for Georgia stations
(all values in inches)

Source: NOAA Technical Report NWS 34, Mean Monthly, Seasonal, and Annual Pan Evaporation for the United States, Richard K. Farnsworth and Edwin S. Thompson, December 1982.

Estimated monthly values for NWS sites

Station       J       F       M     A      M     J       J       A      S       O      N      D      Ann

Athens        2.20  2.66  4.16  5.51  6.43  6.64  6.54  6.36  5.06  4.20  2.99  1.17  55.01

Atlanta       2.12  2.73  4.28  5.78  7.03  7.10  7.07  6.70  5.22  4.14  2.89  2.26  57.13

Augusta      2.18  2.75  4.25  5.66  6.27  6.62  6.49  6.31  5.07  4.19  3.00  2.29  55.09

Columbus   2.05  2.66  4.16  5.51  6.76  6.76  6.10  6.16  5.32  4.35  2.77  2.10  54.91

Macon       2.25  2.92  4.64  6.47  7.85  7.67  7.55  7.14  5.83  4.36  3.03  2.45  62.16

Savannah    2.30  2.87  4.76  6.70  7.62  7.51  7.79  6.83  5.67  4.45  3.06  2.60  61.82

Measured monthly values from pan evaporation stations

Station       J       F       M     A      M     J       J       A      S       O      N      D      Ann

Ailey          2.09  3.06  4.53  5.46  6.61  6.61  6.64  6.21  4.61  3.74  2.64  2.07  54.27

Allatoona Dam
                  -        3       3.87  5.06  5.77  6.27  6.55  5.97  4.71  3.46  2.32  -        -

Athens College of Agriculture
                  2.76  3.20  4.82  6.12  7.13  7.49  7.63  6.83  5.65  4.21  3.03  2.53  61.40

Calhoun Experimental Station
                 -        -        4.63  5.75  6.04  7.24  7.25  6.54  5.23  4.22  3.00  3.00   -
Experiment
                  2.57  3.10  4.78  6.26  7.53  7.96  7.58  6.95  5.61  4.32  3.04  2.36  62.06

Rome         1.77  2.76  3.85  5.29  6.37  6.69  6.85  6.02  5.05  3.76  2.32  1.54  52.27

Savannah    3       3.67  5.69  7.42  7.76  7.91  8.29  7.21  5.75  5.12  3.42  3       68
Tifton Experimental Station
                  2.22  2.78  4.53  6.00  7.08  6.97  6.81  6.32  5.13  4.24  2.80  2.17  57.05


Note that months with values of only one digit do not have enough historical data to give a more precise amount.  Missing data are shown with a  ‘-‘.

For the May-October period, the evaporation from a Free Water Surface can be estimated by multiplying the pan evaporation by 0.75.


Evapotranspiration estimates can be obtained through the Georgia Automated Environmental Monitoring  Network web site and using the Water Balance feature for your selected station to determine Evapotranspiration values.  These are calculated using the standard Penman equation.