Lattimer, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.7 °F (low) to 57.3 °F (high). Annual precipitation averages 51.7 Inches. Lattimer is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.3 °F | 32.8 °F | 3.72 in. |
| February | 18.6 °F | 35.9 °F | 2.86 in. |
| March | 25.7 °F | 44.0 °F | 3.76 in. |
| April | 36.1 °F | 57.1 °F | 4.36 in. |
| May | 46.9 °F | 67.7 °F | 4.23 in. |
| June | 55.4 °F | 75.4 °F | 5.31 in. |
| July | 60.0 °F | 79.8 °F | 4.73 in. |
| August | 58.0 °F | 77.8 °F | 4.91 in. |
| September | 51.3 °F | 71.4 °F | 5.29 in. |
| October | 40.9 °F | 60.2 °F | 4.83 in. |
| November | 31.3 °F | 48.0 °F | 3.71 in. |
| December | 23.0 °F | 37.8 °F | 3.97 in. |
| Annual | 38.7 °F | 57.3 °F | 51.68 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |