Historical weather data, all-time temperature records, and monthly climate averages for Defiance, OH. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4 in Defiance sits right on the edge of spring — the average high is 55° but the low still dips to a frosty 32°. History backs up that volatility: this date has seen a balmy 77° (1956) and a brutal 15° (1982). There's a 43% chance of rain, though snow is nearly off the table at just 2%.
Defiance has seen some genuinely extreme weather over its 133 years of records — from a scorching 111° in July 1934 to a bone-chilling -26° in January 1912, a swing of 137 degrees. A single day in September 1907 dumped 4.63 inches of rain, and a February snowstorm in 1900 buried the area under 12 inches.
Defiance peaks in mid-July with average highs of 85-86°, making summer the clear choice for warm-weather visits. Winter is genuinely cold — late January through early February sees average highs of just 31°. If you're trying to dodge rain, avoid late June into early July, when weekly precipitation averages nearly an inch.