Summer officially starts 1 December in Australia, but other countries use the summer solstice in late December as the official beginning of summer.
This is when the southern hemisphere of the earth is tilted towards the sun. The sun appears to move more southerly in the sky. An explanation for seasonal change is at this website http://www.youtube.com/watch?v=DuiQvPLWziQ
The summer solstice is marked by the day with the greatest length of daylight, “longest day” when the southern hemisphere is tilted closest to the sun. After the summer solstice the length of daylight gradually lessens, or become “shorter” days, as the southern hemisphere begins to tilt away from the sun.
This is the hottest part of the year with very little rain falling. If rain does fall it is usually from thunderstorms, but this quickly disappears because the hot conditions cause the rain to quickly evaporate. Temperatures can reach 40oC or greater for several days. Winds can be very strong, which means plants and soil dry out quickly. More water is needed during these times and this is when mulches are a great benefit to plants by keeping soil around them cooler and moist.
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