Council Bluffs experiences harsh winters, with January and February often seeing temperatures drop below freezing, sometimes as low as -31°C. Spring arrives in March, bringing mild temperatures that quickly warm up by April, which is typically the first month of the season to see average highs above 0°C. Summers are moderate, with June being the warmest month, but still not excessively hot, with average highs rarely exceeding 41°C. Autumn brings a return to cooler temperatures, with October and November often seeing daily lows below freezing. Winters are prolonged, with December's temperatures typically still quite chilly after the initial cold snap of January and February.