Portland, Maine, United States Historical Air Quality Analysis

15°C12/17°C

17°C15/19°C

19°C16/23°C

14°C11/19°C

14°C7/19°C

15°C9/20°C

18°C14/23°C

16°C15/17°C

17°C15/18°C

20°C17/24°C

17°C14/20°C

20°C16/28°C

19°C13/26°C

17°C15/22°C

14°C10/19°C

12°C8/18°C

14°C7/22°C

18°C10/27°C

17°C12/23°C

19°C14/25°C

19°C15/23°C

16°C10/18°C

10°C6/16°C

10°C3/16°C

12°C7/17°C

12°C9/15°C

13°C11/15°C

13°C10/17°C

13°C8/17°C

9°C7/12°C

--°C/°C