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United States › New Jersey › Sussex County › Climate Station SUSSEX AP, NJ US Distance 5.6 mi Normals 1991–2020

30-year climate normals

Sussex County Climate and Weather Averages

Hottest month — July

83.6°

average daily high. The coldest month is January, averaging a low of 18.0°F.

Sussex County gets 40.95" of precipitation a year, and 29% of it falls in Aug, Sep, Oct.

Temperature through the year

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

20° 40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low Precip
January 36.0° 18.0° 2.63"
February 39.3° 19.6° 2.16"
March 47.7° 27.3° 3.20"
April 60.9° 36.7° 3.43"
May 71.4° 47.1° 3.73"
June 79.5° 55.8° 3.68"
July 83.6° 60.9° 4.06"
August 82.0° 59.6° 3.93"
September 74.6° 50.9° 3.83"
October 63.5° 40.3° 4.23"
November 51.4° 30.9° 2.97"
December 40.7° 23.9° 3.10"

Rainfall by month

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

January 2.63"
February 2.16"
March 3.20"
April 3.43"
May 3.73"
June 3.68"
July 4.06"
August 3.93"
September 3.83"
October 4.23"
November 2.97"
December 3.10"
Annual total 40.95"

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 639
Heating degree days How much heating the climate demands 6,048
Approximate annual cooling cost At 23.27¢/kWh, New Jersey average $149
Approximate annual electric heating cost Lower where heating is gas rather than electric $493

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 Sussex County, where electricity is one line of eight.

Common questions

What is the weather like in Sussex County?

Sussex County averages a high of 83.6°F in July and a low of 18.0°F in January. Annual precipitation is 40.95 inches, with essentially no snow.

When is the rainy season in Sussex County?

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

How hot does it get in Sussex County?

The average daily high in July, the hottest month, is 83.6°F. That drives 639 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Sussex County?

Effectively no. Measurable snowfall is rare in Sussex County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station SUSSEX AP, NJ US (USW00054793), 5.6 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, New Jersey residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.