Table 1.
Weather information at the experimental site as obtained from california irrigation management information system (cimis) station located in oakville (#77, Oakville, Napa County) a .
| Month-Year | Precipitation (mm) | Average Maximum Air Temperature (°C) | Average Minimum Air Temperature (°C) | Average Air Temperature (°C) | Growing Degree Days (°C) |
|---|---|---|---|---|---|
| Oct-19 | 0.2 | 26.6 | 4.9 | 15.4 | – |
| Nov-19 | 24.4 | 20.8 | 3.3 | 11 | – |
| Dec-19 | 66 | 14.3 | 5.7 | 9.5 | – |
| Jan-20 | 58.5 | 15.4 | 3.5 | 8.8 | – |
| Feb-20 | 1 | 20.6 | 3.7 | 11.4 | – |
| Mar-20 | 29.8 | 17.6 | 4.4 | 10.7 | – |
| Apr-20 | 25.9 | 23 | 7.1 | 14.6 | 154.2 |
| May-20 | 26.1 | 26.2 | 8.8 | 17.4 | 385.05 |
| Jun-20 | 0.2 | 29.5 | 10.4 | 19.7 | 683.8 |
| Jul-20 | 0.2 | 30.2 | 10.1 | 19.2 | 997.35 |
| Aug-20 | 1.6 | 31.8 | 12.3 | 21.1 | 1359.15 |
| Sep-20 | 0 | 31.4 | 11.1 | 20 | 1525.35 |
| Oct-20 | 0.3 | 29.7 | 8.1 | 17.4 | – |
| Nov-20 | 31.9 | 19.8 | 2.2 | 10.2 | – |
| Dec-20 | 46.4 | 17.1 | 2 | 8.5 | – |
| Jan-21 | 97.5 | 15.7 | 3.6 | 9 | – |
| Feb-21 | 35.3 | 18 | 3.3 | 10.5 | – |
| Mar-21 | 59.6 | 18.5 | 2.6 | 10.3 | – |
| Apr-21 | 4.3 | 23.5 | 4.3 | 13.1 | 116.55 |
| May-21 | 0.4 | 27.7 | 7.2 | 17.3 | 347.6 |
| Jun-21 | 0.3 | 28.7 | 9.3 | 18.8 | 618.1 |
| Jul-21 | 0.2 | 29.5 | 10.8 | 19.2 | 932.6 |
| Aug-21 | 0.2 | 29.7 | 10.1 | 19 | 1239.5 |
| Sep-21 | 0.5 | 30 | 8.7 | 18.6 | 1292.25 |
a
Growing degree days were calculated from 1 April to harvest in each year.