Historical weather data, all-time temperature records, and monthly climate averages for Wood River, IL. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Wood River lands right in the heart of spring's unpredictability — the average high of 61° feels pleasant, but this date has swung anywhere from a bitter 25° low (1975) to a scorching 88° high (2011). Flip a coin on rain: there's a 45% chance of precipitation today historically, though snow is essentially off the table.
Wood River plays in the extremes — a blistering 116° in July 1946 and a bone-cracking -16° in January 1982 represent a 132-degree swing in recorded temperatures. April is also when the heaviest rainfall tends to strike, as evidenced by the all-time wettest day of 7.7 inches falling on April 23, 1996.
Summers here are legitimately hot, with the warmest week of the year (July 9–15) averaging a high of 89°, while January bottoms out around 37–38° for highs. Spring is the wettest stretch — the last week of April averages over an inch of precipitation — so if you're planning a visit, late summer or early fall offers the best balance of warmth and drier conditions.