Weather

Weather does exist in the dome and is controlled artificially to provide seasons, rain, etc. While the intention is normally to keep the weather varied in order to prevent psychosis among the population but not so varied as to make things actually unpleasant, the control systems are imperfect and feedbacks within the dome are still not entirely understood. This variation can lead to extreme weather events such as blizzards, cold snaps, and flooding.

For the most part, however, weather is pleasant (cold enough for a fluffy sweater, warm enough for tank tops, just rainy enough to be pleasant) in Districts 1 and 3. Weather in District 2 is closely monitored to optimize planting, growing, and harvest. And District 4 ? They get what they get.