Santa Maria, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 8.7 °C (low) to 20.4 °C (high). Annual precipitation averages 362.2 Millimeters. Santa Maria is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.7 °C | 17.8 °C | 79.5 mm |
| February | 6.2 °C | 17.9 °C | 81.79 mm |
| March | 7 °C | 18.6 °C | 67.82 mm |
| April | 7.4 °C | 19.3 °C | 23.88 mm |
| May | 9.1 °C | 20.1 °C | 7.62 mm |
| June | 10.5 °C | 21.2 °C | 1.27 mm |
| July | 12.3 °C | 22.3 °C | 1.52 mm |
| August | 12.4 °C | 22.7 °C | 0.25 mm |
| September | 11.7 °C | 23.3 °C | 2.03 mm |
| October | 9.9 °C | 23.2 °C | 15.49 mm |
| November | 7.3 °C | 20.6 °C | 29.46 mm |
| December | 4.9 °C | 17.6 °C | 51.56 mm |
| Annual | 8.7 °C | 20.4 °C | 362.19 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |