Historical weather data, all-time temperature records, and monthly climate averages for Clinton, IA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Clinton runs mild but unpredictable — the average high of 54° sounds pleasant, but this date has swung anywhere from a bitter 19° (1975) to a shirt-sleeve 78° (1942). There's about a 1-in-3 chance of rain today, though snow is essentially off the table.
Clinton's weather has real teeth: the thermometer has climbed to 102° in July and crashed to -33° in January, a jaw-dropping 135-degree swing over the station's history. A single July storm in 2017 dumped over 5 inches of rain in one day, and a January blizzard in 1995 buried the city under 14.5 inches of snow.
Summer is Clinton's sweet spot, with highs peaking around 84° the first week of July — ideal if you can handle the humidity and occasional heavy rain that peaks in mid-June. Winters are genuinely cold, with average January highs barely scraping 29°, so plan accordingly. Spring and fall offer the most comfortable shoulder seasons, with April and October highs in the upper 50s and mid-60s respectively.