Historical weather data, all-time temperature records, and monthly climate averages for Lebanon, OH. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in Lebanon sits right on the cusp of spring's arrival, with a century of data pointing to an average high of 60° and low of 37°. There's a coin-flip chance of rain today, though snow is essentially off the table. The date has swung wildly in the past — from a balmy 81° in 2007 to a brutal 22° low in 1992.
Lebanon's weather has real range — 101 years of records stretch from a scorching 104° on July 3, 2002 to a bone-chilling -25° on January 28, 1963, a swing of 129 degrees. Summer storms can unload fast, as evidenced by the all-time wettest day of 5.1 inches on July 21, 1973, and a single January storm dropped 11 inches of snow as recently as 2026.
Lebanon's warmest stretch runs mid-July, when average highs peak at 86°, while mid-January bottoms out around 35°. If you're trying to dodge rain, avoid mid-May — the wettest week of the year averages over an inch of precipitation. Spring and fall offer the most moderate temps, with April averaging 64° and October at 67°.