The first official heat wave of the season will affect southwestern Connecticut tomorrow through Saturday as temperatures climb well into the 90s. Technically, a heat wave happens when the temperature reaches 90 degrees or more for three consecutive days. However, as dew points climb into the 70s by tomorrow afternoon, the heat and oppressive humidity will make it feel like 100 degrees or hotter each of the next three days.
An Excessive Heat Watch has been issued for Northern Fairfield and New Haven counties from Thursday afternoon through Friday evening. You'll need to take extra precautions if you're going to be outside for any length of time. You may want to reschedule certain activities to the early-morning or evening hours. Know the signs of heat exhaustion and heat stroke, and wear lightweight and loose-fitting clothing when possible. Drink plenty of water, too.
The mercury has topped the 90-degree mark only twice this Summer at Sikorsky Memorial Airport in Stratford, the official recording station for the National Weather Service. Daytime highs of 91 and 95 degrees were recorded July 11 and July 12, respectively. The temperature reached 88 degrees July 13, just two degrees shy of an official heat wave.
The last heat wave to hit southwestern Connecticut happened over a four-day stretch from late August through early September last year. The high temperatures for August 29 through September 1, 2010, were 91, 91, 94, and 93 degrees, respectively. The mercury topped 90 degrees four times last August, helping to push the average daily temperature for the month to 75.1 degrees, two degrees above normal.
Thus far this month, the average temperature is 76.4 degrees, which is 3.1 degrees warmer than normal. That's just two degrees shy of the hottest July on record (78.4 degrees), which happened in 1994. All but four days this month have delivered warmer-than-normal temperatures. The average daytime high temperature is 85.1 degrees, and the average nighttime low temperature is 67.7 degrees. The coolest temperature was 59 degrees on July 1.
In case you're wondering, the average temperature last July was 78 degrees, less than a degree shy of the monthly record. July of 2010 featured an unforgettable Independence Day weekend heat wave which featured high temperatures of 97, 93, 98, and 95 degrees from July 4 through July 7, respectively. In fact, there were seven days with high temperatures in the 90s.
Today will be mostly sunny with some puffy clouds and a high temperature in the mid 80s. Tonight will be mild and muggy with patchy fog developing and a low of 66 to 71 degrees. The heat wave begins tomorrow and will continue through the start of the weekend. Daytime highs will be in the 90s and nighttime lows will hold in the lower 70s. Stay cool.
Paul
