Aguanga, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 9 °C (low) to 25.9 °C (high). Annual precipitation averages 383.8 Millimeters. Aguanga is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.2 °C | 18.7 °C | 81.53 mm |
| February | 4.4 °C | 18.5 °C | 85.6 mm |
| March | 5.4 °C | 20.6 °C | 56.9 mm |
| April | 6.8 °C | 23.3 °C | 25.65 mm |
| May | 9.5 °C | 26.3 °C | 10.67 mm |
| June | 11.4 °C | 31.3 °C | 1.52 mm |
| July | 15.3 °C | 34.8 °C | 5.59 mm |
| August | 15.8 °C | 35.6 °C | 6.1 mm |
| September | 14.1 °C | 32.9 °C | 8.64 mm |
| October | 10.4 °C | 27.7 °C | 15.24 mm |
| November | 6.8 °C | 22.7 °C | 26.42 mm |
| December | 3.7 °C | 18 °C | 59.94 mm |
| Annual | 9 °C | 25.9 °C | 383.8 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |