Upland, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 52.3 °F (low) to 77.6 °F (high). Annual precipitation averages 16.9 Inches. Upland is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 44.1 °F | 66.5 °F | 3.57 in. |
| February | 44.7 °F | 66.9 °F | 4.57 in. |
| March | 46.6 °F | 70.1 °F | 2.77 in. |
| April | 48.9 °F | 73.8 °F | 0.86 in. |
| May | 52.9 °F | 77.6 °F | 0.55 in. |
| June | 57.0 °F | 84.1 °F | 0.12 in. |
| July | 61.9 °F | 90.6 °F | 0.07 in. |
| August | 62.9 °F | 92.4 °F | 0.02 in. |
| September | 61.1 °F | 89.5 °F | 0.13 in. |
| October | 55.3 °F | 81.0 °F | 0.74 in. |
| November | 48.3 °F | 73.3 °F | 0.99 in. |
| December | 43.8 °F | 65.5 °F | 2.53 in. |
| Annual | 52.3 °F | 77.6 °F | 16.92 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |