| CROP | Min °C. | Optimum Range°C | Optimum °C | Max °C |
| Asparagus | 10 | 15-30 | 24 | 35 |
| Bean | 15 | 15-30 | 27 | 35 |
| Bean, Lima | 15 | 18-30 | 30 | 30 |
| Beet | 5 | 10-30 | 30 | 35 |
| Cabbage | 5 | 7-35 | 30 | 38 |
| Carrot | 5 | 7-30 | 27 | 35 |
| Cauliflower | 5 | 7-30 | 27 | 38 |
| Celery | 5 | 15-21 | 21* | 30* |
| Chard, Swiss | 5 | 10-30 | 30 | 35 |
| Corn | 10 | 15-35 | 35 | 40 |
| Cucumber | 15 | 15-35 | 35 | 40 |
| Eggplant | 15 | 24-32 | 30 | 35 |
| Lettuce | 2 | 5-27 | 24 | 30 |
| Muskmelon | 15 | 24-35 | 32 | 38 |
| Okra | 15 | 21-35 | 35 | 40 |
| Onion | 2 | 10-35 | 24 | 35 |
| Parsley | 5 | 10-30 | 24 | 32 |
| Parsnip | 2 | 10-21 | 18 | 30 |
| Pea | 5 | 5-24 | 24 | 30 |
| Pepper | 15 | 18-35 | 30 | 35 |
| Pumpkin | 15 | 21-32 | 35 | 38 |
| Radish | 5 | 7-32 | 30 | 35 |
| Spinach | 2 | 7-24 | 21 | 30 |
| Squash | 15 | 21-35 | 35 | 38 |
| Tomato | 10 | 15-30 | 30 | 35 |
| Turnip | 5 | 15-40 | 30 | 40 |
| Watermelon | 15 | 21-35 | 35 | 40 |
*Daily fluctuation to 10 degrees or lower at night is essential.
From James Edward Knott, Handbook for Vegetable Growers, John Wiley& Sons, Inc., New York, 1357, p. 8. Secondary source: “How to Grow More Vegetables than you ever thought possible on less land than you can imagine”. John Jeavons, Ten Speed Press, California.