Farnam, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.2 °F (low) to 63.1 °F (high). Annual precipitation averages 22.7 Inches. Farnam is located in USDA Plant Hardiness Zone 5b. 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 | 14.2 °F | 38.7 °F | 0.39 in. |
| February | 17.1 °F | 41.4 °F | 0.63 in. |
| March | 25.8 °F | 52.4 °F | 1.13 in. |
| April | 35.3 °F | 61.5 °F | 2.37 in. |
| May | 45.8 °F | 71.4 °F | 3.55 in. |
| June | 56.9 °F | 82.4 °F | 3.56 in. |
| July | 62.2 °F | 87.7 °F | 3.38 in. |
| August | 60.1 °F | 85.7 °F | 2.87 in. |
| September | 50.6 °F | 78.6 °F | 1.68 in. |
| October | 37.1 °F | 65.2 °F | 1.71 in. |
| November | 25.1 °F | 51.6 °F | 0.81 in. |
| December | 16.2 °F | 40.2 °F | 0.57 in. |
| Annual | 37.2 °F | 63.1 °F | 22.65 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |