Hint: Weather
The answer to this puzzle is:
1. CLOUDY
2. LIGHTNING
3. CLOUD
4. DRIZZLE
5. OUTLOOK
6. CELSIUS
7. RAIN
8. MONSOON
9. FLURRY
10. SLEET
11. HEATWAVE
2. LIGHTNING
3. CLOUD
4. DRIZZLE
5. OUTLOOK
6. CELSIUS
7. RAIN
8. MONSOON
9. FLURRY
10. SLEET
11. HEATWAVE