Solar storms occur at all times of the year and at all times of the day, but to see the Northern Lights, it must be dark and clear skies.
The skies in northern Norway is more often clear, and is therefore good opportunity to experience the phenomenon.
January to March are probably the three most popular months for
Aurora hunting because they bring long dark nights.
In the Arctic, January is a time of renewal as the sun reappears
above the horizon but it can be very, cold. Aurora might more likely appear in colder
nights.
In February the weather is improving
and in March, the temperatures begin to rise. It can however still be cold at night. There might be less clouds to obscure the Aurora.
Spring and autumn Equinoxes
(around 20 March and 20 September) is told to have greater Northern Lights activity, not because there are more solar activities during this period, but due to the Earth's angle relative to the Sun the magnetic field does not protect the Earth quite as well.
Keep an eye on the lunar phases, when the Moon is full, it will be difficult to watch the Northern Lights.
My pictures of Northern Lights