Well probably summer
Tornadoes are most likely to occur in the late afternoon and earl evening.
While a tornado can occur at any time of day or night, most tornadoes occur in the late afternoon and early evening.
Spring and fall.
Tornadoes can occur any time of year but it is most likely to happen during a thundery and harsh spring.
summer
Bushfires are common in Australia. They can occur with equal force in grasslands and in bushland. They tend to occur more in the southern states, where summers are hot and dry, but they are also common up the coast of New South Wales, and in limited regions of Queensland, such as the area around Rockhampton.
Tornadoes are most likely to occur in the spring and early summer months, typically between March and June. This is when weather conditions are most conducive for the formation of tornadoes, such as warm, moist air colliding with cool, dry air.
Bushfires can occur throughout Australia, depending on the time of the year. They are more likely to happen in the southern states during Summer and Autumn, in the north during Winter and Spring, and in the middle latitudes during Spring and Summer. They are also more likely in an area which has experienced a period of plenty of rainfall, followed by weeks of dry, hot weather which dries out all the new vegetation which has sprung up. Bushfires in Australia are most like to occur along the eastern seaboard south of the NSW border and southern coastline in heavily vegetated areas. They commonly occur around Sydney, where there are huge tracts of native bushland, and the ranges around Melbourne. Currently (February 2009), bushfires are raging through the mountains and hills around Melbourne, and to the east and west of the capital city, in the Gippsland area, and west as far as Bendigo. Over 100 lives have been lost, and over 700 homes destroyed in Australia's worst bushfires ever. Inland areas of NSW which are full of scrub are prone to bushfires. Canberra is surrounded by wooded ranges, again providing fuel for bushfires as was shown in the 2003 fires where four people lost their lives. South Australia has certainly had its share of fires, despite overall less heavily wooded areas: the Eyre Peninsula bushfires of 2005 were particularly devastating, as were the Ash Wednesday tragedies which reached the outer suburbs of Adelaide. Bushfires also occur over in the bushland around Perth. After a dry season, these areas provide enough fuel for bushfires to quickly spread, and the climate can change from pleasantly temperate to hot, dry and windy - perfect conditions for bushfires. Bushfires are less likely in the far north because of the wetter conditions, but they do still occur. Even Brisbane and the Queensland coast rarely have serious bushfires - certainly not on the devastating scale that has been seen down south. However, Rockhampton and Mount Morgan, just inland from Queensland's central coast, recently (Spring 2009) saw several days of horrific bushfires, as conditions are drier there.
there isnt a specific time, the seasons do not affect when an earthquake occurs
it occurs when it is really rainy and it rains for a long period of time
The most likely time of year for thunderstorms is late spring through the summer. They can occur at any time of the year if the conditions are right.
Rainbows are most likely to occur in the late afternoon as the sun is low in the sky, and after a rain shower when the sun starts to come out. The sun's angle at this time allows the light to be refracted and reflected in the raindrops, creating a rainbow in the sky.