Lost City, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.4 °C (low) to 21.8 °C (high). Annual precipitation averages 1195.8 Millimeters. Lost City is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.8 °C | 9.3 °C | 60.96 mm |
| February | -0.9 °C | 11.7 °C | 62.23 mm |
| March | 3.8 °C | 16.7 °C | 96.52 mm |
| April | 8.6 °C | 21.8 °C | 122.68 mm |
| May | 14.2 °C | 25.8 °C | 157.99 mm |
| June | 19.2 °C | 30.4 °C | 127.76 mm |
| July | 21.5 °C | 33.3 °C | 97.28 mm |
| August | 20.6 °C | 33.3 °C | 86.61 mm |
| September | 16.2 °C | 29.2 °C | 110.49 mm |
| October | 9.6 °C | 22.8 °C | 106.17 mm |
| November | 3.7 °C | 16.5 °C | 92.71 mm |
| December | -1.2 °C | 10.4 °C | 74.42 mm |
| Annual | 9.4 °C | 21.8 °C | 1195.82 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |