Only near the North Pole, where the Sun goes round and round horizontally all day and all night, rising on March 21 and setting on September 22.
September 22
The Answer is September since it is the north
Autumnal Equinox
The northern lights - the Aurora Borealis - it is only visible in the sky from the Northern Hemisphere, the chance of visibility increasing with proximity to the north magnetic pole, it most often occurs from September to October and from March to April. I presume the questioner meant when did it last appear at a particular location. But this cannot be answered without knowing the location.
From March 21 until about September 21, the Earth's northern hemisphere is tilted towardthe sun, and receives more sun light on any day than the southern hemisphere does.
The sun is below the northern horizon at midnight in the Northern Hemisphere.
It varies from September 21 to September 24, depending on the year and the location.
The fall equinox occurs in September in the Northern Hemisphere.
Northern
Well it depends is your location in the Northern Hemisphere or the Southern Hemisphere? Well if your location is in the Northern Hemisphere then you will be tilted toward the sun. If your location is in the Southern Hemisphere then you are tilted away from the sun.
Northern Norway is often called the land of the midnight sun. This is because of its location.
it is in the northern hemisphere
September
Tundra is primarily found in the Northern Hemisphere because of the distribution of land and sea. The Arctic tundra is located around the North Pole and is surrounded by oceans which help moderate the climate. In the Southern Hemisphere, the Antarctic region is mostly covered by ice shelves rather than tundra.
In the northern hemisphere it is in September. In the southern hemisphere it is in March.
Spain is in the Northern Hemisphere.
June -- September . . . . northern Hemisphere December -- March . . . . southern Hemisphere