Historical weather data, all-time temperature records, and monthly climate averages for Oskaloosa, IA. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Oskaloosa is a coin-flip kind of day — 130 years of data puts the average high at 57° and the low at 35°, but the date has swung wildly from a balmy 81° in 1929 to a brutal 6° in 1982. Snow is possible but unlikely, with only a 2% chance of flakes and a 22% shot at any precipitation at all.
Oskaloosa has seen weather that earns its place in the history books: a scorching 112° on July 25, 1936 and a bone-snapping -31° on January 12, 1912 — a range of 143 degrees between its extremes. On the wet side, a single June day in 2000 dropped 6.51 inches of rain, and a late November storm in 2018 buried the area under 16 inches of snow.
Summer is the main event here, with highs averaging 87° during the warmest week of mid-July and June bringing the heaviest rainfall, averaging nearly an inch a week. If you're avoiding the heat and humidity, the shoulder months of April and October offer mild highs in the 60s. Winters are genuinely cold — early January averages just 31° for a high, so pack accordingly.