30-year climate normals

Anne Arundel County Climate and Weather Averages

Hottest month — July

86.0°

average daily high. The coldest month is January, averaging a low of 29.8°F.

Anne Arundel County gets 43.99" of precipitation a year, and 33% 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	43.1°	29.8°	2.84"
February	45.2°	31.5°	2.38"
March	53.1°	38.3°	3.80"
April	63.7°	47.2°	3.38"
May	73.0°	57.3°	3.15"
June	81.5°	67.7°	4.04"
July	86.0°	71.9°	4.94"
August	83.7°	70.5°	4.27"
September	77.4°	64.8°	5.14"
October	67.1°	52.2°	4.04"
November	56.2°	42.3°	3.03"
December	47.2°	34.1°	2.98"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 33% falling in the wettest three months (Jul, Aug, Sep).

January 2.84"

February 2.38"

March 3.80"

April 3.38"

May 3.15"

June 4.04"

July 4.94"

August 4.27"

September 5.14"

October 4.04"

November 3.03"

December 2.98"

Annual total 43.99"

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 1,436

Heating degree days How much heating the climate demands 4,062

Approximate annual cooling cost At 21.77¢/kWh, Maryland average $313

Approximate annual electric heating cost Lower where heating is gas rather than electric $310

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 Anne Arundel County, where electricity is one line of eight.

Common questions

What is the weather like in Anne Arundel County?

Anne Arundel County averages a high of 86.0°F in July and a low of 29.8°F in January. Annual precipitation is 43.99 inches, with essentially no snow.

When is the rainy season in Anne Arundel County?

The wettest stretch is Jul, Aug, Sep, which accounts for 33% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Anne Arundel County?

The average daily high in July, the hottest month, is 86.0°F. That drives 1,436 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Anne Arundel County?

Effectively no. Measurable snowfall is rare in Anne Arundel County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station ANNAPOLIS NAF, MD US (USW00013752), 5.1 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.