January is the peak of the winter season in New Jersey, with cold days and freezing nights. You can jump to a separate table for: North Jersey and South Jersey. All stations have registered readings of 100 degrees F or higher and have records of 0 degrees F or below. This is 1.5°C higher than for the 1900s, which had an average temperature of 11.0°C. The tables give the normals for maximum and minimum temperatures based on weather data collected from 1981 to 2010 by the US National Climatic Data Center. Average temperatures for December at cities, towns, parks and lakes throughout New Jersey are listed below in degrees Fahrenheit and Celsius. Climate is the average of weather over time. Source: Jersey Met, download the chart data. Climate data and weather averages in Newark. 2020-2021 Long Range Weather Forecast for New Jersey, NB ... Winter temperatures will be above normal, on average, with the coldest periods in early to mid-December, mid- and late January, mid-February, and from late February into early March. Climate can mean the average weather for a particular region and time period taken over 30 years. July is the hottest month for New Jersey with an average high temperature of 85.1°, which ranks it as about average compared to other states. Based on weather reports collected during 1985–2015. The average (mean) temperature for the 2010s was 12.5°C. Some general observations about the temperature and precipitation in New Jersey include: 1) Temperature differences between the northern and southern parts of the state are greatest in the winter and least in summer. Average annual air temperatures in Jersey since 1900. With an average of 24.3 °C | 75.7 °F, July is the warmest month. It is the lowest average temperature of the whole year. The National Weather Service Forecast Office in New York, NY provides official forecasts and warnings for New York City, Long Island, the Lower Hudson Valley of New York, Northeastern New Jersey, Southern Connecticut and the surrounding Coastal Waters Annual Weather Averages in Newark. Average annual rainfall in Jersey (millimetres) Disclaimer: Farmers’ Almanac’s Weather History records are based upon data collected and powered by Dark Sky.While we cannot guarantee every reported condition for a given day is accurate, we are continuing to work with Dark Sky to provide information that is as accurate as possible. The temperature has reached -10 degrees C. three times this month . In January, the average temperature is -1.2 °C | 29.8 °F. Newark average temperature. Northern New Jersey. 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