Pittsburg, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12 °C (low) to 24.5 °C (high). Annual precipitation averages 1192 Millimeters. Pittsburg is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.6 °C | 13.5 °C | 91.95 mm |
| February | 3.3 °C | 15.7 °C | 99.06 mm |
| March | 7.2 °C | 20.1 °C | 117.09 mm |
| April | 11.1 °C | 24.1 °C | 105.92 mm |
| May | 16.4 °C | 28.1 °C | 123.44 mm |
| June | 20.7 °C | 32.1 °C | 98.81 mm |
| July | 22.3 °C | 34.2 °C | 70.87 mm |
| August | 21.8 °C | 34.7 °C | 62.48 mm |
| September | 18.4 °C | 31.4 °C | 92.2 mm |
| October | 12 °C | 25.8 °C | 116.84 mm |
| November | 6.7 °C | 19.3 °C | 98.04 mm |
| December | 2.7 °C | 14.6 °C | 115.32 mm |
| Annual | 12 °C | 24.5 °C | 1192.02 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |