Task: Question Generation
Input (English): Background Paragraph: During May, June, and July, the Northern Hemisphere is exposed to more direct sunlight because the hemisphere faces the Sun. The same is true of the Southern Hemisphere in November, December, and January. It is Earth's axial tilt that causes the Sun to be higher in the sky during the summer months, which increases the solar flux. However, due to seasonal lag, June, July, and August are the warmest months in the Northern Hemisphere while December, January, and February are the warmest months in the Southern Hemisphere. 
Story: Bob is planning a couple of trips for himself. He wants to do some traveling in the Northern and Southern Hemisphere. He decided he wants to go to Arizona and Peru at some point in the year, but only wants to go when it is warmest as he hates cold weather.  He is free for his travel in July and August, and again in December and January, and needs to figure out the best months for each of his trips.
Output (English): When would be the best months to travel to Arizona for the warmest weather?