Iselin, NJ Climate


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United States / New Jersey / New York-Newark-Jersey City Metro Area / Middlesex County / Iselin / Zip Codes
Iselin, NJ has a humid subtropical climate typical of the Northeastern United States. Winters are generally cold and snowy, while summers are hot and humid. Average temperatures in January range from a low of around 24°F to a high of 39°F, while average temperatures in July range from a low of 73°F to a high of 86°F. Rainfall is relatively common throughout the year, with an average of 4 inches per month during the winter and 5 inches per month during the summer.

Iselin, New Jersey gets 49 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Iselin averages 25 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 204 sunny days per year in Iselin. The US average is 205 sunny days.

Iselin gets some kind of precipitation, on average, 115 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 86 degrees
Winter Low: the January low is 22
Rain: averages 49 inches of rain a year
Snow: averages 25 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Iselin is 7.2 (10=best), which means it is about average compared to other places in New Jersey.

8.7 Summer - 5.5 Winter
September, June and May are the most pleasant months in Iselin, while January and February are the least comfortable months.

  ClimateIselin, New JerseyUnited States
  48.7 in.38.1 in.
  24.9 in.27.8 in.
  115.1 days106.2 days
  204 days205 days
  86.2°85.8°
  22.2°21.7°
  7.27
  3.94.3
  66 ft.2443 ft.
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Iselin with an average high temperature of 86.2°, which ranks it as warmer than most places in New Jersey. In Iselin, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Iselin are September, June and May.
In Iselin, there are 20.7 days annually when the high temperature is over 90°, which is hotter than most places in New Jersey.
January has the coldest nighttime temperatures for Iselin with an average of 22.2°. This is about average compared to other places in New Jersey.
In Iselin, there are 107.6 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in New Jersey.
In Iselin, there are 0.7 days annually when the nighttime low temperature falls below zero°, which is colder than most places in New Jersey.
The humidity is usually comfortable in Iselin but some summer months can be sticky or muggy. July is the most humid month, though humidity is low for most of the year. The most humid months are July, August and June.
July is the wettest month in Iselin with 5.4 inches of rain, and the driest month is February with 2.9 inches. The wettest season is Autumn with 28% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 48.7 inches in Iselin means that it is wetter than most places in New Jersey.
April is the rainiest month in Iselin with 11.3 days of rain, and October is the driest month with only 8.2 rainy days. There are 115.1 rainy days annually in Iselin, which is less rainy than most places in New Jersey. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 22% chance of a rainy day.
An annual snowfall of 24.9 inches in Iselin means that it is snowier than most places in New Jersey. February is the snowiest month in Iselin with 8.3 inches of snow, and 5 months of the year have significant snowfall.
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