Little Britain, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.5 °F (low) to 63.2 °F (high). Annual precipitation averages 48.9 Inches. Little Britain is located in USDA Plant Hardiness Zone 7a. 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 | 22.9 °F | 39.6 °F | 3.46 in. |
| February | 23.3 °F | 41.9 °F | 2.93 in. |
| March | 30.8 °F | 50.5 °F | 4.31 in. |
| April | 41.2 °F | 62.9 °F | 3.68 in. |
| May | 50.7 °F | 72.7 °F | 3.78 in. |
| June | 60.0 °F | 80.9 °F | 4.63 in. |
| July | 65.1 °F | 85.3 °F | 4.57 in. |
| August | 63.6 °F | 84.1 °F | 4.48 in. |
| September | 56.3 °F | 77.3 °F | 4.91 in. |
| October | 44.6 °F | 66.0 °F | 4.44 in. |
| November | 35.2 °F | 53.9 °F | 3.39 in. |
| December | 27.8 °F | 43.7 °F | 4.28 in. |
| Annual | 43.5 °F | 63.2 °F | 48.86 in. |
| 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 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |