Table 8. t values for monthly mean ETo (mm d−1) estimated by Kpan models in years 1998–2019.
| Month/Model | April | May | June | July | August | September | October |
|---|---|---|---|---|---|---|---|
| S | 4.259 | 3.192 | 15.009 | 25.404 | 22.202 | 18.031 | 12.463 |
| MS | 10.104 | 1.308 | 7.794 | 15.438 | 15.491 | 12.849 | 8.247 |
| WS | 22.770 | 12.778 | 8.797 | 4.855 | 0.385 | 4.705 | 4.870 |
| C | 9.649 | 0.990 | 8.360 | 16.520 | 16.176 | 13.054 | 8.018 |
| AP | 6.886 | 1.206 | 11.484 | 20.255 | 19.211 | 16.359 | 11.419 |
| O | 53.331 | 53.440 | 61.007 | 67.465 | 64.196 | 42.544 | 26.618 |
| P | 9.384 | 0.053 | 9.787 | 17.420 | 18.564 | 16.434 | 12.395 |
| RW | 8.138 | 0.070 | 9.542 | 17.582 | 17.151 | 13.838 | 9.920 |
Notes.
tcrit (0.01) = 2.750 (n = 31) and 2.756 (n = 30); tcrit (0.05) = 2.042 (n = 31) and 2.045 (n = 30).