Winters in Ankeny are cold, with temperatures often dropping below freezing, averaging around -3°C in January and -10°C in February. As spring arrives, temperatures gradually warm up, reaching average highs of 11°C in April and 16°C in May. Summer months bring mild to warm conditions, with averages ranging from 24°C in June to 24°C in July and August. Autumn is generally cool, but not as cold as winter, with September's average high around 20°C and October's around 14°C. The coldest temperatures are typically seen in February, while the warmest months are June, July, and August.