Winters in Gibbon are cold because of frequent incursions of cold continental air. Summers are generally hot but occasionally are interrupted by cold spells when the air is from the north. Snow falls frequently in the Winter, but the snow cover usually is not continuous. The rainfall is heaviest in the late Spring and early Summer.
In Winter, the average temperature in Gibbon is 27.7 degrees Fahrenheit, and the average minimum is 15.6 degrees Fahrenheit. In Summer, the average temperature is 73.6 degrees Fahrenheit with the an average daily high of 86.1 degrees Fahrenheit.
The average total annual precipitation in Gibbon is 24.53 inches. Of this total, 18.8 inches, or 76.16 percent usually falls in April through September, which includes the growing season for most crops. Generally, the highest monthly average precipitation is 4.03 inches in May.
Average seasonal snowfall is 30.4 inches. The mean number of days having .10 or more of snowfall is 48 for the period of record. The maximum monthly total for snowfall in Gibbon was 23 inches in December of 1972.