A temperature reading from Forsyth that briefly circulated as a potential all-time Montana heat record this past weekend will not be certified, the National Weather Service said. The gauge recorded 118 degrees during Eastern Montana's weekend heat wave — a number that, if valid, would have rewritten the state record books. Forecasters reviewed the reading and declined to validate it.
The NWS applies a verification process to potential records that includes examining the equipment, the station's exposure and the consistency of surrounding readings before certifying an extreme measurement. In this case, something in that review led forecasters to conclude the 118-degree figure does not meet the standard for an official record. The agency did not immediately detail what specifically disqualified the reading, but instrument error, siting issues and data logging anomalies are among the factors that can knock a reading out of contention.
That said, the heat across Eastern Montana last weekend was undeniably severe, record or not. Forsyth sits in the Yellowstone River valley in Rosebud County, terrain that bakes under high pressure systems in ways that routinely push temperatures well above what Helenans experience on the same days. The failed record attempt is a reminder of how extreme conditions can get east of the divide — and how carefully the National Weather Service vets readings before those numbers become permanent.