ClimateForecastNovemberDecember >>

Williamstown (NJ) Climate by Month

The temperature in Williamstown can vary greatly throughout the year. The temperatures shift from very warm to cold. It also has a relatively rain/snowy climate with high levels of precipitation. Now, let’s explore all the climate details to give you a full picture.

Average day and night temperature

Depending on the time of the year, temperatures range from very warm to chilly in Williamstown. On average, daytime temperatures range from a very warm 31°C in July to a chilly 6°C in January. Nighttime temperatures can drop, with averages reaching -4°C in January.

The mean minimum and maximum temperatures throughout the year

Precipitation and rainy days

Williamstown has a relatively rain/snowy climate with high precipitation levels, averaging 1267 mm of rain/snowfall annually. The amount of precipitation varies moderately throughout the year. The wettest month, June, sees around 139 mm of rainfall, perfect for those who enjoy a bit of rain now and then. The driest month, February, still receives a respectable 77 mm of rainfall.

The mean monthly precipitation over the year, including rain, hail and snow

Sunshine over the year

In Williamstown, summer days are longer and more sunny, with daily sunshine hours peaking at 9.2 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 4.7 hours.

Monthly hours of sunshine

Data from: Philadelphia, the United States of America (32 KM, 20 Miles).

Daily hours of sunshine

Data from: Philadelphia, the United States of America (32 KM, 20 Miles).

The best time of year to visit Williamstown in the United States of America

Other facts from our historical weather data:
  • When is summer in Williamstown?
    The hottest season / summer takes place in June, July, August and September.
  • Which is the warmest month in Williamstown?
    July has an average maximum temperature of 31°C and is the warmest month of the year.
  • Which is the coldest month in Williamstown?
    The coldest month is January with an average maximum temperature of 6°C.
  • Which is the wettest month in Williamstown?
    June tops the wettest month list with 139 mm of rainfall.
  • Which is the driest month in Williamstown?
    February is the driest month with 77 mm of precipitation.
  • Which is the sunniest month in Williamstown?
    July is the sunniest month with an average of 275 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.

    Forecast for Williamstown (NJ)

    Thu   Nov 21
    11°C | 3°C
    NW 14 km/h
    6.2 mm
    broken clouds and rain

    broken clouds and rain

    Fri   Nov 22
    7°C | 1°C
    SW 22 km/h
    9 mm
    broken clouds and rain

    broken clouds and rain

    Sat   Nov 23
    11°C | 1°C
    NW 22 km/h
    partly cloudy and no rain

    partly cloudy and no rain