Analysis Finds Climate Predictions of Hurricane Pioneer Were Largely Inaccurate
A detailed review of the late William Mason Gray’s climate predictions reveals a pattern of inaccurate forecasting, according to a dossier released by North Denver News. While Gray is credited with inventing seasonal hurricane forecasting and mentoring dozens of meteorologists at Colorado State University, his later assertions regarding global cooling have been contradicted by observational data.
The report, titled “The Colorado Denialist,” analyzed seven of Gray’s specific claims against meteorological records as of October 2026. The findings indicate that three of the claims were substantially correct, three were contradicted by subsequent evidence, and one specific time-bound prediction failed to materialize.
The most notable failure was a forecast Gray presented at the Heartland Institute’s International Conference on Climate Change in May 2012. In that presentation, Gray asserted that a weak global cooling period would continue until approximately 2025-2030.
However, data from the World Meteorological Organization (WMO) contradicts this timeline. A consolidated analysis released Jan. 14, 2026, utilizing eight independent datasets, placed the 2025 global temperature at 1.44 ± 0.13 degrees Celsius above the 1850-1900 average. The WMO further recorded 2023, 2024, and 2025 as the three warmest years in history across all eight datasets, with the period from 2015 to 2025 ranking as the eleven warmest years on record.
Additionally, Copernicus reported that August 2026 was the warmest August ever recorded, further debunking Gray’s cooling hypothesis.
The analysis also highlighted a trend of “moving the goalposts” in Gray’s public statements. Between 2005 and 2007, Gray repeatedly predicted a cooling trend was imminent. In 2005, testifying before the U.S. Senate Committee on Environment and Public Works, he stated a cooling trend would begin “in a few years.” By May 2006, he told The Washington Post the earth might warm for another three to eight years before cooling, and by June 2006, he told The Denver Post the process would begin within three to four years.
Gray, who died in 2016, received the American Meteorological Society’s Jule G. Charney Award in 1993 for his contributions to weather forecasting. Despite his early scientific achievements, the report concludes that his later climate projections were consistently outpaced by actual global temperature rises.
