Baltimore lies within the humid subtropical climate zone,
and weather is primarily affected by three factors: its proximity to a warm
marine estuary, its low elevation, and the wall of mountains to the west and
northwest. These factors make the area's climate milder and less extreme than
other U.S. cities at this latitude. Summers are humid and hot, but not
extremely so, with highs reaching the high 80s to low 90s Fahrenheit and lows
in the 60s to low 70s. Winters are cool to mild and moist, with highs in the
upper 40s to low 50s, and lows in the 30s and 40s. It is almost never below
10°F in the
