What would you like toWhy do different regions experience different climates at differnt times of the yea ask?

"Weather" is what we have today. "It's raining." "It's sunny." "It's cold."

"Climate" is what you learn to expect after watching a hundred years worth of weather. "Summers are hot in Phoenix." "Seattle has rainy winters" "Maine gets a lot of snow in winter."

When Phoenix has a sunny sky and a temperature of 110F in July, while Seattle has 68F and has rain, the two "regions" are experiencing different weather. Weather depends upon a large number of factors that are so difficult to accurately balance in their effects on the weather that even supercomputers can only come up with accurate "weather" forecasts for about three to four days. Beyond that, weather forecasts are less accurate. Beyond two weeks, weathermen and computers have to guess, based upon "climate" models.

So, simply, Montreal, Miami, and San Francisco have different weather because of their latitudes (how close to the equator or north pole), what side of the continent they're on, how close they are to an ocean, what direction the winds generally blow, how much sunlight they're getting (which depends upon the time of year, less sun in winter, more in summer), what mountains are near, how much of the ground is covered by snowfall, how much vegetation is growing (spring & summer) or dormant (winter), and numerous other factors all add to the variation in weather, and climate.