After two to three days of blistering heat from Richmond, Virginia to Portland, Maine, a cold front closes in that will bring cooler, less humid conditions by the weekend.
Wednesday and Thursday, more than 500 record high temperatures were tied or set in the U.S. (some of these in the Midwest and Southwest) compared to just 74 record low temperatures (mainly in the Northwest).
The core of the heat aligned with I-95 cities from the mid-Atlantic northward.
Richmond, Newark, and New York City were among a set of cities and towns that set records highs in the mid-to-upper 90s on Wednesday.
On Thursday, Washington, D.C. established a new record high, soaring to 99. Baltimore did one better, reaching the century mark - tying the record set in 1923. Record highs in the upper 90s were also set in New York City, Hartford and Boston.
Temperatures also sizzled to record levels in New England’s interior and on the water: Burlington, Vermont set back to back record highs Wednesday and Thursday when the mercury surged to 95 and 97. Nantucket sizzled to 92 Thursday - not only a daily high, but a record for the entire month of June.
AccuWeather has put together some nice tables showing record highs day-by-day this week.
A considerable portion of the high temperature records set were for low temperatures, as the nighttime hours provided little relief from the oppressive heat. Climate Central’s Andrew Freedman describes the remarkable high minimum temperature record set in Boston Thursday:
In Boston, the low temperature on June 21 only fell to 80°F, which set a record for the date and marks only the second time that an 80-degree low temperature was recorded during June. The last time such a warm overnight temperature was recorded was on June 6, 1925, according to the National Weather Service.
Washington, D.C. also set a record high minimum temperature Thursday, dipping to just 78 as did New York City (both airports), only bottoming out at 79.