1971 - 2000 Average Monthly Evaporation (inches)

Station                   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec   Annual
Corvallis                                   2.99  4.52  6.03  7.90  7.62  5.67  2.71              37.44
Malheur Exp. Stn.                           6.22  8.85  9.78 11.67 10.60  7.64  4.31  0.13        59.20
North Willamette Exp. Stn 0.47  1.19  2.40  3.25  5.07  5.91  7.28  6.85  4.97  2.60  1.00  0.67  41.66
Union Exp. Stn.                                   4.98  6.00  7.72  7.12  4.78  3.40              34.00