Those of you in the mountains can expect some snow, whereas for the rest, it's just cold and maybe wet. Be prepared with warm winter clothes because there is no central heating anywhere to thaw you out. Even the hardy Canadians among your ranks will shiver. Thermal undies recommended. You will either be moved to doubt, or to be thankful for, the fact that Miyazaki is one of Japan's warmest prefectures.
Spring is by and large warm.
Warm sunny days are interspersed with rainy ones. Some warmer days can be expected in late-February near the coast, but they are few and far between. Prolonged warm spells come along in mid-March and early April. At this time, some rain can be expected too. By now you won't need winter coats, but woolens come in just as handy as shorts.