why don't summer temps slope upward up to june 20th (equinox) and then slope downward afterwards?

Answer 1

Because there's a lag.

In July and August, the sun is still up most of the time pumping heat and pelting your location with photons. So, for weeks after the solstice, the tempeature continues to rise. So the hottest days, on average, are mid-to-late July, aren't they?

Proof: ignore the daily highs! What counts are the daily LOWS, which always peak after the summer solstice, everywhere.

Sort-of-a-proof: this effect is MINIMAL where the ground is most efficient at "catching" and holding heat, which is where the temperature differential between day and night is minimal, which is mid-ocean. But the peak is still in July instead of June.

Really WHOPPINGLY BIG ocean currents can change this --San Francisco has got to have the coldest July temperatures in the 48 states except for Glacier National Park. But the ocean currents make September the hottest month there -- so the "exceptions" to this rule are due to enormous other energy transfers that overrule the sun's schedule.

Answer 2

Here's the short answer, someone can probably do better.

Because it takes time for the oceans in the northern hemispheres to warm up. Even though the days are getting shorter, the land and oceans still get a lot of sun so they continue to warm up.

Also, the days only lose a few minutes of daylight during the first few weeks after June 21. the days are technically shorter, but not by that much.

Answer 3

I believe you mean the Summer Solstice. The equinox occurs in spring (vernal equinox) and fall (autumnal equinox) when the day and night are of equal length.

The Summer Solstice occurs when the days are the longest.

Because of a slight lag and a myriad of other parameters, the temperature does not correlate directly with the position of the sun.

Answer 4

The summer solstice is June 21 (the first day of summer). One poster is faulty: the solstices (summer and wintry climate) and the equinoxes (vernal and autumnal) do no longer all start up on the 21st. they determination from 365 days to 365 days by using variations contained in the the tropical 365 days and the calendar 365 days.

Answer 5

This is a phenomenon called "seasonal lag." Because water is slow to absorb and emit radiation due to its high specific heat, the maximum temperature by hemisphere lags behind maximum insolation.

Answer 6

it should be so .. but further affected by variious factors that alter the temp according to the topography the wind speed the air layers and ocean deep to surface temp .. humidity afeects the feeling of the temp ..as well