30-year climate normals

Harford County Climate and Weather Averages

Hottest month — July

86.4°

average daily high. The coldest month is January, averaging a low of 25.3°F.

Harford County gets 47.11" of precipitation a year, and 29% 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	41.5°	25.3°	3.26"
February	44.1°	27.1°	2.78"
March	52.5°	33.1°	4.10"
April	64.8°	43.2°	3.49"
May	73.2°	52.7°	3.98"
June	82.1°	62.4°	4.28"
July	86.4°	67.7°	4.84"
August	84.4°	65.8°	4.21"
September	78.2°	58.8°	4.84"
October	66.9°	46.5°	4.17"
November	55.5°	36.8°	3.27"
December	45.8°	30.2°	3.89"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 29% falling in the wettest three months (Jul, Aug, Sep).

January 3.26"

February 2.78"

March 4.10"

April 3.49"

May 3.98"

June 4.28"

July 4.84"

August 4.21"

September 4.84"

October 4.17"

November 3.27"

December 3.89"

Annual total 47.11"

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 1,171

Heating degree days How much heating the climate demands 4,706

Approximate annual cooling cost At 21.77¢/kWh, Maryland average $255

Approximate annual electric heating cost Lower where heating is gas rather than electric $359

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 Harford County, where electricity is one line of eight.

Common questions

What is the weather like in Harford County?

Harford County averages a high of 86.4°F in July and a low of 25.3°F in January. Annual precipitation is 47.11 inches, with essentially no snow.

When is the rainy season in Harford County?

The wettest stretch is Jul, Aug, Sep, which accounts for 29% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Harford County?

The average daily high in July, the hottest month, is 86.4°F. That drives 1,171 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Harford County?

Effectively no. Measurable snowfall is rare in Harford County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station ABERDEEN PHILLIPS FLD, MD US (USW00013701), 8.3 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.