In the late June weekly Weatherbell meeting we discussed at some length the late June heat wave. It was mentioned that most records were night lows not all-time record highs.

TWC searching the data for a record heat wave found that was so. This was their assessment.

June 2025 By Jonathan Erdman Weather Channel

The heat wave currently gripping the Northeast and Midwest U.S. has already smashed records not just for a particular calendar day, but also anytime in June. In a few locations, it’s even tied or set new all-time records.

So far, most of the monthly or all-time records have mainly been regarding hot low temperatures. But that changed beginning on Monday and may be the case again Tuesday in a few more areas.

We have a list of these notable heat records below.

All-Time Records

- Plattsburgh, New York: Tied its all-time record high of 101 degrees Monday. On the shores of Lake Champlain, they reached 100 degrees for only the fourth time in their almost 80-year period of record. It was the first time they did so in almost 50 years, since an Aug. 1-2, 1975 heat wave.

- Alpena, Michigan: Their daily low of 79 degrees Monday topped their previous record of 77 set three other times in 1919, 1927 and 1948.

- Eau Claire, Wisconsin: Their daily low of 82 degrees Sunday topped their previous record of 81 set both on June 27, 1991 and July 20, 1932.

- Gaylord, Michigan: Their low of 78 degrees Sunday topped their previous record 77 set both on August 29, 1973 and July 7, 1973.

- Green Bay, Wisconsin: Tied their all-time hottest low of 79 degrees Sunday, which was previously set on July 4, 1897, and July 30, 1916. That was their hottest low in almost 109 years.

- Lansing, Michigan: Tied their all-time hottest low of 78 degrees Sunday, which was previously set on Aug. 1, 2006 and July 18, 1942.

- Wausau, Wisconsin: Tied their all-time hottest low of 78 degrees Sunday, which was previously set on July 4, 1999.

- Minneapolis-St. Paul had their record earliest in June 80-degree lows both Saturday (80) and Sunday (82).

June Monthly Records

- North Hartland, Vermont: This reporting station near the New Hampshire border soared to 101 degrees Monday, tying Vermont’s June record with St. Johnsbury on June 4-5, 1919, according to weather records expert Maxmiliano Herrera and weather historian Christopher Burt. This Vermont town was hotter than both Tucson and Yuma, Arizona, Monday (each reached 99 degrees).

- Atlantic City, New Jersey: The marina site tied its record hottest June low of 79 degrees Monday, previously reached in 1952 and 2016.

- Mt. Pocono, Pennsylvania: Set a new June record high of 93 degrees Monday. It was their first 90-degree high in almost 12 years and their hottest day since July 18, 2012.

- Wallops Island, Virginia: Tied their June record hot low of 79 degrees Monday, previously also set in 1991.

- Wilmington, Delaware: Tied their June record hot low of 77 degrees Monday, previously also set in 1894, 1895, 1952 and 2014.

- Cheyenne, Wyoming: Set a new June record hot low of 67 degrees Saturday. That may not sound that hot, but Cheyenne is at 6,160 feet elevation, over 800 feet higher than Denver, and is in a semi-arid High Plains climate.

- Grand Rapids, Michigan: Set a new June record hot low of 80 degrees Sunday, topping their previous June record of 79 degrees on June 20, 1953.

- Holland, Michigan: Tied their June record ho low of 80 degrees Sunday, previously reached on June 15, 2022 and June 20, 1953.

- Mason City, Iowa: Set a new June record hot low of 77 degrees Saturday, edging out the previous record of 76 degrees from June 21, 1931.

- Waterloo, Iowa: Tied their June record hot low of 77 degrees Saturday, previously reached in June 1931, 1954 and 2024.
- La Crosse, Wisconsin: Tied their June record hot low of 80 degrees Sunday, previously reached on June 29, 1931. This equaled Sunday’s daily low in Phoenix, which is near their average for late June.

- Rockford, Illinois: Tied their June record hot low of 77 degrees Sunday, previously reached on June 14, 1981.

Jonathan Erdman is a senior meteorologist at weather.com and has been covering national and international weather since 1996. Extreme and bizarre weather are his favorite topics.
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As you know, the all-time records for heat waves peaked in the 1930s.

Heat Waves - the real story

Some politicians and many in the mainstream media believe that heat waves are one of the most important global causes of weather-related mortality, and GHG is leading to more frequent and intense heat waves.

Heat waves are often promoted as greenhouse gas’s greatest threat. In reality, the UHI (Urban Heat Island) warming is primarily elevated nighttime lows not record highs. The 1930s continues to dominate all-time record highs.

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John Christy has shown that the number of record high temperatures per year for USHCN stations with at least 100 years of record (804 stations). Again the 1930s dominate.

The EPA maintains a Heat Wave Index for the US. It has shown the same 1930 decade dominance.

A 2015 paper in the Lancet by Antonio Gasparrini showed cold killed 20 times more than heat in 13 countries including Australia, Brazil, Spain and Thailand.

Another Lancet study ominously reported that from 2000 to 2019 in England and Wales there were an average of 791 heat-related excess deaths and 60,753 cold-related excess deaths each year. That’s an excess death ratio of about 85 to 1 for cold temperatures. “Our analysis indicates that the excess in mortality attributable to cold was almost two orders of magnitude higher than the excess in mortality attributable to heat.”

Lancet updated the story on excess winter mortality in this 2025 paper.

See also an earlier paper on excess winter mortality for multiple locations by D’Aleo and MacRae. See this epidemiology summary with many such regional studies.

Given the data, non-optimal temperatures are reasonably considered among the leading risk factors of mortality worldwide. A global analysis of 4.6 million deaths from cold and about 489,000 from heat, a ratio of roughly 9:1 of cold versus heat. This pattern is also consistent in regional studies.

Our climate changes on multi-decadal cycles. Based on past cycles we should soon return into our next cold period.

SUMMARY

The 2009 Endangerment Finding, as one of its three lines of evidence, claimed that the Earth had been facing record setting global average surface temperatures. However, such global average surface temperature data have been, and continue to be totally fabricated for a very significant portion of the planet for which there was no surface temperature data whatsoever until relatively recently, all to provide support for global warming claims. 

By documenting the unscientific course taken to come to that conclusion should drive decision makers to return to the scientific method and a policy that will support economic growth and prosperity even as we prepare our country and the world for the next cold period likely coming soon. Given that the excess mortality in the cold months of this warmer interval has been a larger multiple of that in the heat in warm months that would make sense. Along the way ensuring our future energy sources are reliable would be a critical step.