Evapotranspiration Calculations

Portland Airport - December 2025 daily calculations

Date Evapotrans-
piration (mm) 0000- 2400
Rain (mm) 0900- 0900 Pan Evaporation (mm) 0900- 0900 Max Temp Min Temp Max Rel Hum (%) Min Rel Hum (%) Average 10m Wind Speed (m/sec) Solar Radiation (MJ/sq m)
01/12/20253.10.0 15.09.089647.2319.08
02/12/20253.60.0 16.88.086635.0123.99
03/12/20257.00.0 25.97.294275.7731.50
04/12/20256.70.0 26.415.897346.0229.38
05/12/20254.30.0 18.86.9100632.8531.63
06/12/20253.10.0 16.78.9100587.7716.57
07/12/20254.70.0 16.38.772526.3129.61
08/12/20253.90.0 20.410.4100547.7019.04
09/12/2025 0.0  8.199473.9829.95
10/12/2025     93603.2824.33
11/12/2025   18.8 96624.9131.78
12/12/20255.90.0 29.19.997312.8926.53
13/12/20254.2  18.612.498624.5628.36
14/12/20254.40.0 16.812.390499.5024.20
15/12/20254.10.0 16.310.669514.3521.84
16/12/20254.70.0 19.111.495583.4731.64
17/12/20256.80.0 30.18.2100242.9031.40
18/12/20258.70.2 34.413.975134.1228.38
Totals:75.20.2       

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