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Monthly Average Potential Evapotranspiration (PET) Estimates (inches)
Station Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Albany, NY0.310.491.172.213.584.054.453.802.471.370.570.30
Allentown, PA0.440.651.442.463.804.274.694.012.701.650.770.44
Atlantic City, NJ0.550.771.532.473.834.344.774.132.841.810.900.55
Baltimore, MD0.590.831.682.693.964.434.764.112.901.880.960.58
Bangor, ME0.270.450.981.863.113.563.913.422.201.200.490.27
Beckley, WV0.490.711.542.593.634.044.203.832.731.780.890.50
Binghamton, NY0.260.421.001.933.233.634.003.412.131.220.480.25
Boston, MA0.370.571.151.953.093.584.023.492.291.360.630.37
Bridgeport, CT0.440.631.312.213.413.904.383.762.521.540.740.44
Buffalo, NY0.240.400.991.923.263.744.053.432.231.180.470.24
Burlington, VT0.240.420.971.963.263.744.133.472.181.130.450.23
Caribou, ME0.170.300.731.512.883.393.643.071.840.890.310.16
Charleston, WV0.560.841.792.954.074.524.674.223.082.021.010.57
Cleveland, OH0.290.481.162.193.544.104.483.732.501.390.580.29
Concord, NH0.330.531.172.203.463.974.423.842.481.420.630.35
Elkins, WV0.480.711.542.583.684.124.373.952.781.800.880.49
Erie, PA0.260.431.052.053.454.034.393.652.361.270.510.25
Hartford, CT0.410.611.342.323.574.034.503.862.601.530.710.41
Huntington, WV0.550.821.792.974.124.574.784.283.111.990.970.55
New York (LaGuardia), NY0.450.661.382.323.584.024.413.782.591.590.750.45
Newark, NJ0.470.691.452.403.634.064.463.802.641.630.780.46
Philadelphia, PA0.510.731.532.543.854.294.674.062.811.760.860.51
Pittsburgh, PA0.350.551.322.363.554.034.363.792.611.540.670.35
Portland, ME0.330.521.081.913.093.614.083.542.301.290.580.34
Providence, RI0.420.621.292.143.323.724.153.532.451.490.710.42
Rochester, NY0.270.431.042.013.423.884.223.562.271.230.500.26
Scranton, W-B, PA0.370.581.312.323.654.104.483.802.491.500.670.37
Syracuse, NY0.270.431.062.113.523.964.313.642.331.290.510.26
Washington, DC0.610.861.702.733.914.364.664.072.901.890.980.61
Williamsport, PA0.380.601.392.423.764.224.543.862.481.530.680.38
Wilmington, DE0.520.741.542.553.904.374.774.132.831.770.860.52
Worcester, MA0.330.511.122.033.203.594.033.492.271.310.590.33

About PET Averages

The values in this table represent estimates of the average monthly potential evapotranspiration (PET) for a grass-covered surface based on the NRCC's adaptation of the MORECS model. The model uses hourly climate data collected at first-order weather stations to produce monthly PET sums. The values displayed above reflect an average PET for the month based on the years 1981-2010.