Lattimer, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.7 °C (low) to 14.1 °C (high). Annual precipitation averages 1312.7 Millimeters. 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 | -8.2 °C | 0.4 °C | 94.49 mm |
| February | -7.4 °C | 2.2 °C | 72.64 mm |
| March | -3.5 °C | 6.7 °C | 95.5 mm |
| April | 2.3 °C | 13.9 °C | 110.74 mm |
| May | 8.3 °C | 19.8 °C | 107.44 mm |
| June | 13 °C | 24.1 °C | 134.87 mm |
| July | 15.6 °C | 26.6 °C | 120.14 mm |
| August | 14.4 °C | 25.4 °C | 124.71 mm |
| September | 10.7 °C | 21.9 °C | 134.37 mm |
| October | 4.9 °C | 15.7 °C | 122.68 mm |
| November | -0.4 °C | 8.9 °C | 94.23 mm |
| December | -5 °C | 3.2 °C | 100.84 mm |
| Annual | 3.7 °C | 14.1 °C | 1312.65 mm |
| 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 : -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 |