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Thursday, July 31, 2014

August Traditionally Hot & Tropical

I'm sure many people won't be too happy to see July end. It's been a typical July weatherwise. In fact, the monthly rain total of 3.46" is just 0.14" above normal. The average temperature of 75.2 degrees is just 0.8 degrees above the norm. You may recall last July was the hottest month ever on record at Sikorsky Memorial Airport with an average daily temperature of 78.5 degrees, which was 4.2 degrees above normal and 0.1 degree above the record of 78.4 degrees set in 1994. There were two heat waves, including a record-setting seven-day heat wave from July 14 through July 20. However, August can be just as hot and oppressive.

You may recall that August of 2010 was much warmer than normal. We experienced a heat wave the last three days of the month, and the average monthly temperature (75.1 degrees) was less than one degree from the record of 76 degrees set in 1955. Eight years ago, we christened August with a heat wave when the first three days established record high temperatures of 95, 96, and 97 degrees, respectively, at Sikorsky Memorial Airport in Stratford.

Traditionally, August is the second warmest month of the year with a mean average temperature of 73.1 degrees, just behind July's average of 74 degrees, based on 40 years worth of data. The mercury has actually climbed to 100 degrees twice --- on August 9, 2001, and August 27, 1948. In fact, the daily record highs for the month never dip below 90 degrees. The warmest August on record (1955) featured two of the most potent rainstorms.

However, there are subtle signs that Summer is in decline over the next four weeks. The normal high temperature falls from 82 degrees on August 1 to 78 degrees by the end of the month. The overall mean temperature drops from 75 degrees to 70 by August 31. In fact, the record low temperature on August 29 is 44 degrees!

Daily sunshine continues to dwindle, too. We'll enjoy 14 hours and 21 minutes of daylight at the start of the month. But, by the last day of August, the Sun is out for 13 hours and nine minutes. We lose about an hour and a quarter of daylight over the next 31 days. In fact, sunrise occurs at 6:18 and sets at 7:27 by August 31. Remember, on the first day of Summer, the Sun set at 8:30.

As far as rainfall is concerned, the month averages about 3.75" of precipitation. The wettest August happened in 1952 when 13.29" of rain fell. There have been some drenching rains in August, including 4.66" on August 19, 1991, 4.01" on August 27, 2006, 3.99" on August 11, 2000, 3.92" on August 12, 1955, and 3.69" on August 21, 1952. Remember, we are in the heart of hurricane season, and tropical moisture is always a threat.

Long-time area residents will never forget August of 1955 when two of the most memorable hurricanes --- Connie and Diane --- battered the Northeast. Hurricane Connie soaked New England with torrential rains on August 13, 1955. Just five days later, Tropical Storm Diane followed suit creating massive flooding not seen since the 1930s.

The combination of Connie and Diane yielded rainfall totals close to 25 inches in some areas, resulting in unprecedented flooding. Nearly all of the major rivers in the lower Connecticut Valley exceeded flood stage. Some rivers rose more than 20 feet over their banks. There was tremendous destruction in the Naugatuck River Valley, especially in the city of Ansonia.

Summer officially reaches its halfway point this weekend. Another fairly nice day is ahead, but there is a threat of a shower later this afternoon and this evening with a high temperature in the upper 70s to close to 80 degrees. Unfortunately, it looks like the weekend will begin on a rainy note, as an area of low pressure moves North along a stationary front. Hopefully, we'll be able to salvage the latter half of the weekend. The start of next week promises to be fair and quite warm with daytime highs in the lower 80s. Good-bye, July!