30-year climate normals

Rockland County Climate and Weather Averages

Hottest month — July

83.2°

average daily high. The coldest month is January, averaging a low of 22.4°F.

Rockland County gets 47.75" 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.

Month	Avg high	Avg low	Precip
January	37.3°	22.4°	3.20"
February	40.1°	23.7°	2.53"
March	47.6°	30.5°	4.11"
April	59.2°	40.1°	4.20"
May	69.2°	49.8°	3.94"
June	78.0°	59.1°	4.25"
July	83.2°	64.9°	4.07"
August	81.2°	63.6°	4.36"
September	74.2°	56.7°	4.94"
October	63.0°	45.5°	4.33"
November	52.2°	36.2°	3.64"
December	42.3°	28.0°	4.18"

Rainfall by month

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

January 3.20"

February 2.53"

March 4.11"

April 4.20"

May 3.94"

June 4.25"

July 4.07"

August 4.36"

September 4.94"

October 4.33"

November 3.64"

December 4.18"

Annual total 47.75"

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 787

Heating degree days How much heating the climate demands 5,492

Approximate annual cooling cost At 29.93¢/kWh, New York average $236

Approximate annual electric heating cost Lower where heating is gas rather than electric $575

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 Rockland County, where electricity is one line of eight.

Common questions

What is the weather like in Rockland County?

Rockland County averages a high of 83.2°F in July and a low of 22.4°F in January. Annual precipitation is 47.75 inches, with essentially no snow.

When is the rainy season in Rockland 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 Rockland County?

The average daily high in July, the hottest month, is 83.2°F. That drives 787 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in Rockland County?

Effectively no. Measurable snowfall is rare in Rockland County.

Sources

Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station WESTCHESTER CO AP, NY US (USW00094745), 17.6 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 York residential average.
Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.