Since tsunamis are not affected by the seasons, they can occur at any time. Tsunamis are caused by things like volcanic eruptions, earthquakes and meteor impacts and have nothing to do with the different seasons.
The word "tsunami" comes from the Japanese word "tsu" meaning harbor, and "nami" meaning wave. A tsunami is not the same as a tidal wave and tsunamis have the potential to be far more dangerous than a tidal wave. Some large tsunamis can travel at speeds of up to 500 miles per hour and major tsunamis, although unpredictable, occur about once every 10 years.
When scientists figure out how to predict earthquakes, they will stand a better chance at predicting tsunamis and learning how to protect the public from this dangerous phenomenon.