30-year climate normals

Baltimore city Climate and Weather Averages

Hottest month — July

90.1°

average daily high. The coldest month is January, averaging a low of 30.0°F.

Baltimore city gets 43.73" of precipitation a year, and 31% of it falls in Jul, Aug, Sep.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

Month	Avg high	Avg low	Precip
January	43.7°	30.0°	3.07"
February	46.8°	31.9°	2.75"
March	55.2°	38.7°	3.93"
April	66.8°	48.2°	3.55"
May	75.9°	58.0°	3.39"
June	85.4°	67.7°	3.36"
July	90.1°	72.9°	4.71"
August	87.3°	71.0°	4.35"
September	80.4°	64.5°	4.49"
October	68.8°	52.6°	3.49"
November	57.6°	42.6°	2.98"
December	48.0°	34.6°	3.66"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 31% falling in the wettest three months (Jul, Aug, Sep).

January 3.07"

February 2.75"

March 3.93"

April 3.55"

May 3.39"

June 3.36"

July 4.71"

August 4.35"

September 4.49"

October 3.49"

November 2.98"

December 3.66"

Annual total 43.73"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 1,749

Heating degree days How much heating the climate demands 3,859

Approximate annual cooling cost At 21.77¢/kWh, Maryland average $381

Approximate annual electric heating cost Lower where heating is gas rather than electric $294

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in Baltimore city, where electricity is one line of eight.

Common questions

What is the weather like in Baltimore city?

Baltimore city averages a high of 90.1°F in July and a low of 30.0°F in January. Annual precipitation is 43.73 inches, with essentially no snow.

When is the rainy season in Baltimore city?

The wettest stretch is Jul, Aug, Sep, which accounts for 31% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Baltimore city?

The average daily high in July, the hottest month, is 90.1°F. That drives 1,749 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Baltimore city?

Effectively no. Measurable snowfall is rare in Baltimore city.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station MD SCI CTR BALTIMORE, MD US (USW00093784), 1.3 miles from the county centroid.
Heating and cooling degree days — NOAA, same station and period.
Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Maryland residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.