Newtown, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.2 °C (low) to 15.5 °C (high). Annual precipitation averages 1302.5 Millimeters. Newtown is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.6 °C | 4.6 °C | 90.42 mm |
| February | -3.8 °C | 6.1 °C | 71.63 mm |
| March | 0.1 °C | 10.4 °C | 109.73 mm |
| April | 5.7 °C | 17.2 °C | 94.74 mm |
| May | 11.2 °C | 22.5 °C | 107.95 mm |
| June | 16.4 °C | 27.5 °C | 113.79 mm |
| July | 19.3 °C | 30.2 °C | 124.46 mm |
| August | 18.4 °C | 29.2 °C | 124.97 mm |
| September | 14.4 °C | 25.7 °C | 106.93 mm |
| October | 7.9 °C | 18.9 °C | 102.36 mm |
| November | 2.3 °C | 12.8 °C | 84.33 mm |
| December | -1.8 °C | 7.2 °C | 113.03 mm |
| Annual | 7.1 °C | 17.7 °C | 1244.34 mm |
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.7 °C | 1.7 °C | 92.2 mm |
| February | -6.9 °C | 3.2 °C | 70.36 mm |
| March | -2.6 °C | 8.1 °C | 103.89 mm |
| April | 3.2 °C | 15.3 °C | 105.16 mm |
| May | 8.7 °C | 20.9 °C | 107.7 mm |
| June | 13.6 °C | 25.6 °C | 125.22 mm |
| July | 15.8 °C | 28.4 °C | 127.25 mm |
| August | 14.8 °C | 27.4 °C | 113.79 mm |
| September | 10.9 °C | 23.6 °C | 135.13 mm |
| October | 4.8 °C | 17 °C | 124.21 mm |
| November | -0.2 °C | 10.1 °C | 95 mm |
| December | -4.4 °C | 4.3 °C | 102.62 mm |
| Annual | 4.2 °C | 15.5 °C | 1302.53 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |