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Climate & Weather Averages in Williamstown, New Jersey, USA

Currently: 57 °F. Partly cloudy. (Weather station: Philadelphia International Airport, USA). See more current weather

Annual Weather Averages Near Williamstown

Averages are for Philadelphia International Airport, which is 18 miles from Williamstown.

Based on weather reports collected during 1985–2015.

All Year Climate & Weather Averages in Williamstown

High Temp: 88 °F

Low Temp: 26 °F

Mean Temp: 56 °F

Precipitation: 1.70"

Humidity: 64%

Dew Point: 44 °F

Wind: 8 mph

Pressure: 30.05 "Hg

Visibility: 9 mi

January Climate & Weather Averages in Williamstown

High Temp: 41 °F

Low Temp: 26 °F

Mean Temp: 34 °F

Precipitation: 1.65"

Humidity: 65%

Dew Point: 22 °F

Wind: 9 mph

Pressure: 30.11 "Hg

Visibility: 9 mi

February Climate & Weather Averages in Williamstown

High Temp: 43 °F

Low Temp: 27 °F

Mean Temp: 35 °F

Precipitation: 1.31"

Humidity: 61%

Dew Point: 22 °F

Wind: 9 mph

Pressure: 30.09 "Hg

Visibility: 9 mi

March Climate & Weather Averages in Williamstown

High Temp: 53 °F

Low Temp: 35 °F

Mean Temp: 44 °F

Precipitation: 2.00"

Humidity: 59%

Dew Point: 29 °F

Wind: 9 mph

Pressure: 30.08 "Hg

Visibility: 10 mi

April Climate & Weather Averages in Williamstown

High Temp: 64 °F

Low Temp: 44 °F

Mean Temp: 54 °F

Precipitation: 1.67"

Humidity: 59%

Dew Point: 39 °F

Wind: 9 mph

Pressure: 30.00 "Hg

Visibility: 10 mi

May Climate & Weather Averages in Williamstown

High Temp: 74 °F

Low Temp: 54 °F

Mean Temp: 64 °F

Precipitation: 1.58"

Humidity: 63%

Dew Point: 51 °F

Wind: 8 mph

Pressure: 30.01 "Hg

Visibility: 9 mi

June Climate & Weather Averages in Williamstown

High Temp: 83 °F

Low Temp: 64 °F

Mean Temp: 74 °F

Precipitation: 1.94"

Humidity: 64%

Dew Point: 61 °F

Wind: 7 mph

Pressure: 29.97 "Hg

Visibility: 9 mi

July Climate & Weather Averages in Williamstown

High Temp: 88 °F

Low Temp: 70 °F

Mean Temp: 79 °F

Precipitation: 2.03"

Humidity: 64%

Dew Point: 65 °F

Wind: 7 mph

Pressure: 29.98 "Hg

Visibility: 9 mi

August Climate & Weather Averages in Williamstown

High Temp: 86 °F

Low Temp: 68 °F

Mean Temp: 77 °F

Precipitation: 1.92"

Humidity: 66%

Dew Point: 64 °F

Wind: 7 mph

Pressure: 30.02 "Hg

Visibility: 9 mi

September Climate & Weather Averages in Williamstown

High Temp: 78 °F

Low Temp: 61 °F

Mean Temp: 70 °F

Precipitation: 1.49"

Humidity: 68%

Dew Point: 58 °F

Wind: 7 mph

Pressure: 30.06 "Hg

Visibility: 9 mi

October Climate & Weather Averages in Williamstown

High Temp: 67 °F

Low Temp: 49 °F

Mean Temp: 58 °F

Precipitation: 1.42"

Humidity: 67%

Dew Point: 46 °F

Wind: 8 mph

Pressure: 30.08 "Hg

Visibility: 10 mi

November Climate & Weather Averages in Williamstown

High Temp: 56 °F

Low Temp: 39 °F

Mean Temp: 48 °F

Precipitation: 1.45"

Humidity: 65%

Dew Point: 36 °F

Wind: 8 mph

Pressure: 30.13 "Hg

Visibility: 10 mi

December Climate & Weather Averages in Williamstown

High Temp: 46 °F

Low Temp: 31 °F

Mean Temp: 38 °F

Precipitation: 1.96"

Humidity: 65%

Dew Point: 27 °F

Wind: 9 mph

Pressure: 30.12 "Hg

Visibility: 9 mi

Quick Climate Info

Hottest MonthJuly (79 °F avg)
Coldest MonthJanuary (34 °F avg)
Wettest MonthJuly (2.03" avg)
Windiest MonthMarch (9 mph avg)
Annual precip.20.42" (per year)

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