Northern Wisconsin’s 4.47% exceptional drought is the largest in the U.S. Drought Monitor’s record, which begins in 2000

Exceptional drought, the U.S. Drought Monitor’s D4 category, now covers parts of Bayfield, Douglas, Iron, Ashland and Sawyer counties in far northern Wisconsin.

The map valid October 6, 2026 and released two days later put a share of the state in that top tier larger than any the Wisconsin State Climatology Office could point to before. The category is the most severe on a five-step scale, and Wisconsin rarely sees any of it.

The figure is 4.47% of the state’s area, as of October 6, according to Spectrum News 1’s report on the data. The previous high was 3.29%, set on September 19, 2023. The State Climatology Office called it the largest exceptional drought in state history, and that history is the Drought Monitor’s own: its weekly summary page lets readers step back only to January 4, 2000. A bigger drought may well have occurred earlier, but no D4 map exists to measure it.

The Drought Monitor method behind a D4 line

The U.S. Drought Monitor is produced jointly by the National Drought Mitigation Center at the University of Nebraska-Lincoln, the U.S. Department of Agriculture and the National Oceanic and Atmospheric Administration. The author of the October 6 map for the contiguous states was Richard Tinker of NOAA’s Climate Prediction Center, with Anthony Artusa covering the Pacific and Caribbean regions. The map was released Thursday, October 8, according to the current map page.

Its own explanation of method carries a plain heading: the map is made by people, not computers. Authors start from the prior week’s map, weigh indicators by place and season, and fold in impact reports from local experts. Short-term measures look at precipitation over one to three months. For most indicators, D4 corresponds to the driest two percent of conditions in the record, and for the standardized precipitation indexes to a value of minus 2.0 or lower, as the classification page lays out.

The rainfall shortfall behind the northern Wisconsin core

The week’s national narrative named the mechanism in a single line: light precipitation fell on northern Wisconsin, Michigan’s Upper Peninsula and adjacent areas, which produced broad one-category deterioration. Exceptional drought expanded across northern Wisconsin, and severe drought, or D2, was added across a large part of the Upper Peninsula. A one-category slide is the signature of a dry spell that keeps going, not a single dramatic event: each week without meaningful rain pushes a county one step further down the scale.

Statewide totals can hide that. Drought.gov’s Wisconsin page, whose figures carry inconsistent valid dates, reports August as the 33rd driest since 1895, at 2.78 inches, 1.00 inch below normal, while January through August ranked as the 47th wettest. In other words, a wet start to the year did not protect the north once the deficit built through late summer and into autumn. Conditions were improving further south, and Spectrum News reported southern Wisconsin drought-free.

What D4 means for wells, forests and the north woods

Within the state, the other categories sit around the D4 core. Spectrum News reported that other northern areas were in extreme, severe or moderate drought. Drought.gov’s category table, which may not match the October 6 week exactly, listed about 4.5% of Wisconsin in D4, 16.0% in D3 and 20.1% in D2, with roughly half the state in some level of drought. The exceptional patch is small in area but sits inside a much larger dry region.

For residents, the practical stakes are water and fire. Drought.gov notes that long-term drought can affect groundwater, which is the source for private wells across the north woods, and that dry grasses and trees are more flammable, so prolonged drought can raise wildfire intensity and severity. It also points to Wisconsin Department of Natural Resources fire management resources for current conditions. That page does not report present well levels for the state, so the extent of any well trouble is not yet documented in the sources reviewed.

Reading the record carefully

The wording matters. The 4.47% figure is a share of Wisconsin’s land area, not a count of people or a measure of how dry the soil is at any one spot. A map category also changes weekly, and the next Drought Monitor release could move the northern boundary in either direction. Spectrum News attributed the record claim to the State Climatology Office, which shared it publicly, and did not name an individual at the office.

What the numbers establish is narrower than the original phrase “ever recorded” suggests, and also firmer: across every weekly Drought Monitor map available since January 2000, none put more of Wisconsin in D4 than the October 6, 2026 map did. Readers tracking the north woods through autumn can watch whether the next release holds, shrinks or extends that 4.47%.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

More from Morning Overview