"Dog Days of Summer" Have Officially Arrived

The “Dog Days” of Summer officially start today. No, that’s not because I relented and turned on the air conditioners. Most people casually refer to the "Dog Days" as a period of hot and humid weather. But did you know that the dog days are a 40-day period which lasts from early July through mid-August?

The dog days of Summer run from July 3 through August 11 in the Northern Hemisphere and have to do with the star Sirius, known as “the dog star.” Sirius is the brightest star in the Northern Hemisphere other than the Sun, and it is found in the constellation Canis Major; thus the name “dog star.”

In the Summer, Sirius rises and sets with the Sun. During late July, Sirius is in “conjunction” with the Sun. The ancients believed that its heat added to the heat of the Sun, creating a stretch of hot and sultry weather. They named this period of time, from 20 days before the conjunction to 20 days after, the “dog days” after the dog star.

In ancient times, when the night sky was unobscured by artificial lights and smog, different groups of peoples in different parts of the world drew images in the sky by “connecting the dots” of stars. The images drawn were dependent upon the culture.

The Chinese saw different images than the Native Americans, who saw different pictures than the Europeans. These star pictures are now called constellations, and the constellations that are now mapped out in the sky come from our European ancestors.

They saw images of bears (Ursa Major and Ursa Minor), twins (Gemini), a bull (Taurus), and others, including dogs (Canis Major and Canis Minor). The brightest of the stars in Canis Major (the big dog) is Sirius. The star can be seen prominently in the Winter in the Northern Hemisphere, adjacent to Orion the Hunter.

The conjunction of Sirius with the Sun varies somewhat with latitude. Also, the constellations today are not in exactly the same place in the sky as they were in ancient Rome. Although we are in the middle of the dog days of Summer right now, the heat is not due to the added radiation from a far-away star, regardless of its brightness. The heat of Summer is a direct result of the earth’s 23.5 degree tilt on its axis, meaning the Northern Hemisphere is tilted toward the Sun during the Summer.

Welcome to the "Dog Days."

Paul

Previewing the Month of July

Half the year is over. Now that July is here, it’s time to look ahead at what the month brings climatologically to southwestern Connecticut. I'm sure you remember the record heat wave six years ago. The temperature climbed to 90 degrees July 14, 2013, and reached into the 90s the next six days for a seven-day heat wave. That was unprecedented across southwestern Connecticut. In fact, we also experienced a four-day heat wave from July 5 through July 8.

Not surprisingly, July is the warmest month of the year with a mean temperature of 74 degrees. The hottest temperature ever recorded at Sikorsky Memorial Airport happened  July 22, 2011, when the mercury topped 103 degrees, tying the record originally set in 1957. The following day, July 23, 2011, another record high of 96 degrees was recorded.

The mercury reached the century mark two other times — July 2, 1966 and July 5, 1999. In fact, the average daily temperature climbs from 72 degrees at the start of the month to 75 by July 31. July of 2013 was the warmest on record with an average temperature of 78.5 degrees, breaking the previous mark of 78.4 degrees in 1994.

July of 2010 was another hot one. You may recall the heat wave over the Independence Day holiday weekend nine years ago. The high temperatures from July 4 through July 7, 2010, were 97, 93, 98, and 95 degrees, respectively. In fact, record high temperatures were established July 6 and 7. The temperature also reached 95 degrees July 24. The average temperature for the month was 78 degrees, a half-degree shy of the all-time record set in 2013.

Many people have asked me why the hottest time of the year happens over a month after the first day of Summer. Well, it takes the Earth awhile to absorb the heat. As the Sun’s angle gets higher in the sky and the days grow longer in May and June, the Northern Hemisphere slowly starts to warm.

It’s much like warming your home. When you turn your thermostat up to 72 degrees after being away all day in the Winter, it will take awhile for the house to warm up. It doesn’t happen instantly. That’s why our hottest days are typically in July and early August.

On the flip side, the coolest temperature ever recorded in these parts in July was 49 degrees on July 1, 1988. Aside from that, every record low for the month is in the 50s. Believe it or not, according to the National Weather Service record book, a trace of snow fell at the airport on July 4, 1950. I find that too hard to believe.

As far as precipitation is concerned, the wettest July on record happened in 1971 when over a foot of rain (12.84″) fell. The average monthly rainfall is 3.77 inches. There have been several memorable rainstorms in July. For example, nearly a half-foot (5.95″) of rain fell on July 19, 1971, and nearly four inches (3.93″) was recorded on July 29, 1990. Two other days delivered well over three inches of rain — July 30, 1960 (3.57″) and July 23, 1953 (3.45″).

The length of daylight actually decreases this month. For example, today, the Sun rises at 5:23 and sets at 8:30. By the middle of the month, on July 15, the Sun rises at 5:32 and sets at 8:24. However, at the end of the month, it rises at 5:47 and sets at 8:10, meaning we lose 44 minutes of daylight. Remember, the “longest” day of the year happened at the Summer Solstice in late June.

Enjoy July!

Paul

Full Strawberry Moon Occurs Next Monday, June 17, 2019

June's Full Strawberry Moon happens this coming Monday, June 17, at 4:31 a.m. EDT. The name was universal to every Algonquin tribe. However, in Europe they called it the Rose Moon. The relatively short season for harvesting strawberries comes each year during the month of June, so the Full Moon that occurs during that month was christened for the strawberry!
                            

The June Full Moon is also called a Honey Moon in the Northern Hemisphere, possibly because it never gets very high in the sky. When we gaze toward the Full Moon tonight, we are seeing it through more of the Earth’s atmosphere than when the Moon is overhead. The atmosphere reddens its color.

The Full Moon is especially low in the Northern Hemisphere because it occurs a few days before the Summer Solstice. The Full Moon is opposite the Sun in the sky. Therefore, when the Sun is higher in the Summer sky, the Full Moon is lower. Every Full Moon stands more or less opposite the Sun in our sky. That’s why the Moon looks full.

The Moon will rise around sunset, climb to its highest point around midnight, and set close to sunrise. As seen from both the Northern and Southern hemispheres, the Moon – like the December Solstice Sun – will rise far South of due East and set far South of due West.

North of the Arctic Circle, the Full Moon – like the Winter Sun – will be too far South to climb above the horizon. Meanwhile, in the Southern Hemisphere – where it’s Winter now – the Full Moon will mimic the Summer Sun, arcing high in the heavens. South of the Antarctic Circle, the Moon will simulate the midnight Sun – up all hours around the clock.

Paul

Summer Solstice Occurs Friday, June 21, 2019

Ask any child when Summer begins, and he or she will undoubtedly respond with the date of the last day of school. Ask an adult and his or her answer is most likely either June 20 or June 21. In case you're wondering, the Summer Solstice happens Friday, June 21, at 11:54 a.m. EDT.

That’s when the Sun’s rays will be directly over the Tropic of Cancer, marking their northernmost point on the face of the Earth. The Sun rises at 5:19 a.m. and sets at 8:30 p.m., which is the latest Sunset during the year. We’ll enjoy 15 hours and 11 minutes of Sunlight on the first day of Summer.

Two days later, the Sun rises at 5:20, and the days begin to get “shorter” once again. Remember, since the first day of Summer is “the longest day” of the year, the days actually become shorter by the end of the month and the remainder of the Summer.

So, why does the Summer Solstice actually happen? Well, the seasons of the year are caused by the 23.5 degree tilt of the Earth’s axis. Because the Earth rotates like a gyroscope, the North Pole points in a fixed position constantly, while the Earth is revolving around the Sun. During one half of the year, the Northern Hemisphere has more exposure to the Sun than the Southern Hemisphere, while the reverse is true during the other half of the year. At noontime, the Sun appears high in the sky during Summertime, and when the Sun reaches its maximum elevation, or angle, in the sky, that’s when the Summer Solstice happens.

Summer was a joyous time of the year in prehistoric times for the Aboriginal people who lived in the Northern latitudes. The snow had melted, the ground thawed out, and warm temperatures returned. Flowers were in full bloom, and leaves had returned to the trees. More important, food was easier to find, and crops had been planted and would be harvested for months to come. The Full Moon is June is called the Full Honey Moon. Tradition dictates that this is the best time to harvest honey from the hives.

This time of the year, between the planting and harvesting of crops, is the traditional time for weddings because many ancient peoples believed that the grand union of the goddess and god occurred in early May. Since it was unlucky to compete with the gods, many people delayed their weddings until June. Today, June remains a favorite month for marriage.

Native Americans have constructed many stone structures linked to the Equinoxes and Solstices. Many are still standing today. One of them is called Calendar One. It is a natural amphitheatre of about 20 acres in size in Vermont. From a stone enclosure in the center of the bowl, one can see a number of vertical rocks and other markers around the edge of the bowl. “At the Summer Solstice, the Sun rose at the southern peak of the East ridge and set at a notch at the southern end of the West ridge.” The Winter Solstice and both equinoxes were similarly marked.

I’d love to be at Calendar One a week from Friday. The start of each of the four seasons carries more significance to this writer than New Year’s Day, which, in essence, is an arbitrary day on the calendar. The start of Summer is just a week-and-a-half away, and that is reason to celebrate in the Northern Hemisphere.

Paul 

Rainy Pattern in April Continues Into May

The last two days could not be any more different weatherwise in southwestern Connecticut. Rain continues to fall early this afternoon, and the temperature is 45 degrees F along the Mill River on Brookside Drive in Fairfield, which is the normal high temperature for March 10.

Today marks the seventh day with measured rain this month (58% of days) and the 26th day since April 1 (62% of days) with measured rain in southwestern Connecticut. Here's a look at the Samp Mortar Dam on Brookside Drive in Fairfield.

Yesterday, meanwhile, was just about picture-perfect across the region. The daytime high temperature was 70 degrees, which occurred just after 3 p.m. EDT, and the sky was deep and blue for most of the day.

Today, though, is a different story. Just take a look at the radar as of early this afternoon.

Paul

Rare "Winter" Storm Affected Northeast 42 Years Ago Today

A "Winter" storm system brought snow and record-cold temperatures to much of New England on this date 42 years ago. In fact, at Sikorsky Memorial Airport in Stratford, a trace of snow fell, and the temperature dropped to 37 degrees that morning, establishing a record low for this date. Other than a trace of snow which was reported May 27, 2010, it's the latest Spring day on which any snow has ever fallen in southwestern Connecticut.

The storm was quite shocking for this time of the year. Consider the normal high temperature for May 9 is 65 degrees, and the normal low temperature is 48. Snow in southwestern Connecticut is almost unheard of seven weeks after the Vernal Equinox. The coldest temperature ever recorded this month was 31 degrees on March 10, 1966.

According to the Naugatuck Daily News, "A Spring storm dumped several inches of snow on some parts of Berkshire County in Massachusetts. The area hardest hit by the storm was Great Barrington, Massachusetts, where police reported 10 inches of snow on the ground. Similar amounts were reported in parts of Vermont. Great Barrington police said there 'were about 100 trees down, wires are down, and we've got reports of accidents we can't get to.'"

Residents in the northwestern Connecticut rural communities of Goshen and Cornwall reported unofficial snow depths of up to five inches. The snow began to fall heavily in the Hartford area at the height of the commuter rush, slowing traffic considerably on most roads. The National Weather Service said a deepening area of low pressure over Connecticut produced a variety of weather conditions across Western Connecticut.

I consider myself a local weather history buff, but I honestly don't remember this storm. Special thanks to local weather expert Ralph Fato for recalling it and bringing it to my attention. It certainly had to be memorable for those who had to dig out of nearly a half-foot of snow in the northwestern corner of the state. I'm sure they were wearing their Winter coats, too, with the mercury plunging into the 30s.

Paul