It might seem logical for the hottest days in the Northern Hemisphere to fall around the June solstice, when the sun reaches its northernmost point for the year. But the hottest days in the north actually come a month or two after the solstice. And in the Southern Hemisphere, the coldest weather doesn’t arrive until a month or two after the June solstice. Why? It’s down to a phenomenon known as the lag of the seasons.
Why the north’s hottest days follow the solstice
You can understand this phenomenon if you’ve ever visited a beach in June. On Northern Hemisphere beaches around now, you’ll notice how cold the ocean feels. Or think about mountaintops in June, which can often still be blanketed by ice and snow. The summer sun still hasn’t had time to melt the ice and warm the oceans.
So that’s why the hot weather lags behind the year’s longest day and highest sun.
By August, ocean water on that same beach will be much warmer. And the snow line will have crept up the mountaintops. That’s why the hottest weather comes some months after the year’s longest day. The land and oceans simply need those extra months to warm up – to store heat – after the cold of winter.
And in the Southern Hemisphere
In the Southern Hemisphere now, the same phenomenon is occurring but in reverse. There, the lag of the seasons is delaying the year’s coldest weather. The June solstice, for the Southern Hemisphere, is the winter solstice. The coldest weather comes in July and August because the land and oceans in that part of the world take some extra weeks to give up their stored heat.
Bottom line: The June solstice marks the height of the sun in the Northern Hemisphere, but the hottest weather comes a month or two later. The phenomenon is called the lag of the seasons, and the same process occurs in reverse in the Southern Hemisphere.
Read more: June solstice 2026: All you need to know
Watch: Solstices and equinoxes seen from space
The post Why aren’t the hottest days on the solstice? first appeared on EarthSky.
from EarthSky https://ift.tt/uZGAlz9
It might seem logical for the hottest days in the Northern Hemisphere to fall around the June solstice, when the sun reaches its northernmost point for the year. But the hottest days in the north actually come a month or two after the solstice. And in the Southern Hemisphere, the coldest weather doesn’t arrive until a month or two after the June solstice. Why? It’s down to a phenomenon known as the lag of the seasons.
Why the north’s hottest days follow the solstice
You can understand this phenomenon if you’ve ever visited a beach in June. On Northern Hemisphere beaches around now, you’ll notice how cold the ocean feels. Or think about mountaintops in June, which can often still be blanketed by ice and snow. The summer sun still hasn’t had time to melt the ice and warm the oceans.
So that’s why the hot weather lags behind the year’s longest day and highest sun.
By August, ocean water on that same beach will be much warmer. And the snow line will have crept up the mountaintops. That’s why the hottest weather comes some months after the year’s longest day. The land and oceans simply need those extra months to warm up – to store heat – after the cold of winter.
And in the Southern Hemisphere
In the Southern Hemisphere now, the same phenomenon is occurring but in reverse. There, the lag of the seasons is delaying the year’s coldest weather. The June solstice, for the Southern Hemisphere, is the winter solstice. The coldest weather comes in July and August because the land and oceans in that part of the world take some extra weeks to give up their stored heat.
Bottom line: The June solstice marks the height of the sun in the Northern Hemisphere, but the hottest weather comes a month or two later. The phenomenon is called the lag of the seasons, and the same process occurs in reverse in the Southern Hemisphere.
Read more: June solstice 2026: All you need to know
Watch: Solstices and equinoxes seen from space
The post Why aren’t the hottest days on the solstice? first appeared on EarthSky.
from EarthSky https://ift.tt/uZGAlz9
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