30-year climate normals

Monmouth County Climate and Weather Averages

Hottest month — July

86.5°

average daily high. The coldest month is January, averaging a low of 22.9°F.

Monmouth County gets 48.57" of precipitation a year, and 27% of it falls in Jun, Jul, Aug.

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	41.7°	22.9°	3.87"
February	44.4°	25.0°	3.10"
March	51.4°	31.3°	4.20"
April	63.0°	41.2°	3.83"
May	72.0°	50.6°	3.81"
June	81.1°	60.1°	4.44"
July	86.5°	65.5°	4.65"
August	84.6°	63.4°	4.13"
September	78.1°	56.1°	4.19"
October	66.6°	44.3°	4.13"
November	56.2°	35.7°	3.54"
December	46.7°	28.0°	4.68"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 27% falling in the wettest three months (Jun, Jul, Aug).

January 3.87"

February 3.10"

March 4.20"

April 3.83"

May 3.81"

June 4.44"

July 4.65"

August 4.13"

September 4.19"

October 4.13"

November 3.54"

December 4.68"

Annual total 48.57"

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 1,017

Heating degree days How much heating the climate demands 4,988

Approximate annual cooling cost At 23.27¢/kWh, New Jersey average $237

Approximate annual electric heating cost Lower where heating is gas rather than electric $406

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 Monmouth County, where electricity is one line of eight.

Common questions

What is the weather like in Monmouth County?

Monmouth County averages a high of 86.5°F in July and a low of 22.9°F in January. Annual precipitation is 48.57 inches, with essentially no snow.

When is the rainy season in Monmouth County?

The wettest stretch is Jun, Jul, Aug, which accounts for 27% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Monmouth County?

The average daily high in July, the hottest month, is 86.5°F. That drives 1,017 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Monmouth County?

Effectively no. Measurable snowfall is rare in Monmouth County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station FREEHOLD-MARLBORO, NJ US (USC00283181), 5.5 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, New Jersey residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.