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United States › New York › Suffolk County › Climate Station RIVERHEAD RSCH FARM, NY US Distance 1.8 mi Normals 1991–2020

30-year climate normals

Suffolk County Climate and Weather Averages

Hottest month — July

83.9°

average daily high. The coldest month is January, averaging a low of 26.0°F.

Suffolk County gets 47.22" of precipitation a year, and 27% of it falls in Oct, Nov, Dec.

Temperature through the year

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

40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low Precip
January 39.7° 26.0° 3.79"
February 41.3° 26.9° 3.31"
March 48.3° 32.7° 4.72"
April 59.8° 41.5° 4.08"
May 70.2° 51.0° 3.60"
June 78.6° 60.6° 3.82"
July 83.9° 66.9° 3.05"
August 82.3° 66.1° 3.93"
September 75.7° 60.2° 4.07"
October 64.9° 49.5° 4.46"
November 54.0° 40.0° 3.81"
December 44.9° 31.9° 4.58"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 27% falling in the wettest three months (Oct, Nov, Dec).

January 3.79"
February 3.31"
March 4.72"
April 4.08"
May 3.60"
June 3.82"
July 3.05"
August 3.93"
September 4.07"
October 4.46"
November 3.81"
December 4.58"
Annual total 47.22"

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 945
Heating degree days How much heating the climate demands 4,906
Approximate annual cooling cost At 29.93¢/kWh, New York average $283
Approximate annual electric heating cost Lower where heating is gas rather than electric $514

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 Suffolk County, where electricity is one line of eight.

Common questions

What is the weather like in Suffolk County?

Suffolk County averages a high of 83.9°F in July and a low of 26.0°F in January. Annual precipitation is 47.22 inches, with essentially no snow.

When is the rainy season in Suffolk County?

The wettest stretch is Oct, Nov, Dec, which accounts for 27% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in Suffolk County?

The average daily high in July, the hottest month, is 83.9°F. That drives 945 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Suffolk County?

Effectively no. Measurable snowfall is rare in Suffolk County.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station RIVERHEAD RSCH FARM, NY US (USC00307134), 1.8 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 York residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.