The line graph illustrates average monthly temperatures in three major cities.
Generally speaking, it is evident that temperature of Paris and Boston decrease, whereas the reverse is true for Melbourne. It is also worth noting that the temperature in Boston is the highest compared to other cities.
Focusing on the weather of Melbourne, it started at just over 25°C in January. Having reached its lowest point at about 16°C in July, the temperature of Melbourne gradually recovered till December.
Looking on the details of countries which experience a decline in their temperatures, Boston and Paris commence at just under and just over 5 °C, respectively. The temperature in Boston rises steadily from under 5 °C to nearly 32 °C, reaching its peak in August before declining to virtually its starting point in December. The temperature of Paris start growing up from roughly 7 °C in January, staying stable during July and August. Yet, it decreases to under 10°C in December.