- The climate of the nation's capital is characterized by chilly, damp winters and hot, humid summers.
- The normal daily mean temperature is 58°F (14°C), ranging from 35°F (2°C) in January to 80°F (27°C) in July. The record low, –15°F (–26°C), was set on 11 February 1899; the all-time high, 106°F (41°C), on 20 July 1930.
- Precipitation averaged 39.4 in (100 cm) yearly during 1971–2000; snowfall, 17 in (43 cm).
- The average annual relative humidity is 75% at 7 AM and 53% at 1 PM.
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