30-year climate normals

Carroll County Climate and Weather Averages

Hottest month — July

85.2°

average daily high. The coldest month is January, averaging a low of 20.8°F.

Carroll County gets 42.12" 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	39.4°	20.8°	2.61"
February	42.3°	21.8°	2.48"
March	51.3°	29.3°	3.66"
April	63.3°	39.0°	3.35"
May	72.6°	49.6°	4.17"
June	81.1°	59.3°	3.22"
July	85.2°	63.1°	4.32"
August	83.5°	60.9°	3.76"
September	77.0°	53.6°	4.80"
October	65.7°	42.1°	3.59"
November	54.2°	32.7°	3.10"
December	43.8°	25.2°	3.06"

Rainfall by month

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

January 2.61"

February 2.48"

March 3.66"

April 3.35"

May 4.17"

June 3.22"

July 4.32"

August 3.76"

September 4.80"

October 3.59"

November 3.10"

December 3.06"

Annual total 42.12"

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 853

Heating degree days How much heating the climate demands 5,423

Approximate annual cooling cost At 21.77¢/kWh, Maryland average $186

Approximate annual electric heating cost Lower where heating is gas rather than electric $413

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 Carroll County, where electricity is one line of eight.

Common questions

What is the weather like in Carroll County?

Carroll County averages a high of 85.2°F in July and a low of 20.8°F in January. Annual precipitation is 42.12 inches, with essentially no snow.

When is the rainy season in Carroll County?

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 Carroll County?

The average daily high in July, the hottest month, is 85.2°F. That drives 853 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Carroll County?

Effectively no. Measurable snowfall is rare in Carroll County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station YORK AP, PA US (USW00093778), 25.6 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.