Why do Aphid populations increase between October through February?

Question

We were shown a graph today in Biology, which showed the population of a certain type of Aphids throughout the 12 months of the year. The population increased greatly between the month of October and February. I was wondering why that happened at such a time, because where I live, the plants the Aphid feeds on have lost there leaves. I was unable to ask the teacher as the bell rang just then. My most reasonable guesses for this would be either this type of Aphid lives in the Southern Hemisphere, where October through February are the warmest months, or the Aphid thrives in cooler conditions, such as the moderate temperatures in, say, Florida. What are your ideas as to why this occurs?

Answer 1

You might get better answers in Biology.