Tennant, California has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 34.5 °F (low) to 60.2 °F (high). Annual precipitation averages 24.4 Inches. Tennant is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.4 °F | 41.4 °F | 4.24 in. |
| February | 24.1 °F | 44.4 °F | 3.7 in. |
| March | 27.0 °F | 49.3 °F | 3.33 in. |
| April | 29.7 °F | 55.0 °F | 1.78 in. |
| May | 36.3 °F | 64.3 °F | 1.58 in. |
| June | 42.8 °F | 73.5 °F | 0.8 in. |
| July | 51.4 °F | 83.9 °F | 0.29 in. |
| August | 50.1 °F | 83.1 °F | 0.3 in. |
| September | 43.8 °F | 76.1 °F | 0.5 in. |
| October | 35.5 °F | 62.8 °F | 1.31 in. |
| November | 27.4 °F | 48.4 °F | 2.55 in. |
| December | 22.2 °F | 40.1 °F | 4.0 in. |
| Annual | 34.5 °F | 60.2 °F | 24.38 in. |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |