The Equinox Effect — Best Months to Go — Aurora Guide
The Equinox Effect — Best Months to Go
Aurora season runs September to March — but not all months are equal. Around the spring and autumn equinoxes (mid-March and mid-September), aurora activity is statistically about 50% higher than in December or January, even with similar solar activity.
The reason is geometry: twice a year, Earth's magnetic field is tilted in exactly the right way relative to the solar wind to let far more particles in. Scientists call this the Russell–McPherron effect. It's reliable enough to plan around.
OCT – FEB
Good. Dark nights, but Sun–Earth geometry is less favourable. Aurora happens, but storms are quieter on average.
SEP & MAR
Best. Long dark nights and peak geomagnetic activity. Historically the most aurora-rich months of the year.
APR & AUG
Borderline. Solar activity is still elevated from the equinox, but nights are short and twilight limits viewing hours.
💡 If you can choose: Target the second week of September or the second week of March. You get the equinox boost, full astronomical darkness, and — in September — the first clear crisp nights after summer.
Check tonight's aurora forecast