Weathermondo.com
United StatesThe weather in December in Iselin
It's cold in December in Iselin with an average temperature of 5°C. Temperatures this month range from a low of 0°C to a high of 9°C. At night, you can expect temperatures between -7°C and 2°C.
Looking for sun? December isn’t a good month to be in Iselin. There’s too much chance of rain this month.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in December for Iselin, Pennsylvania. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 20°C in 2015, Iselin reached the highest temperature in December over the past 10 years. The lowest daytime temperature in this month was -13°C in 2022. The extreme nighttime temperatures ranged from a lowest recorded value of -19°C to a highest value of 14°C.
Precipitation and snowfall
In December, there is an average of 101 mm of precipitation, spread over 13 days. Of the total precipitation, about 11 cm falls as snow in December. The wind speed is around 4 Bft, mostly coming from the Southwest.
Daily weather in December for Iselin
Click on any day in December to get detailed info about the usual weather on that day in Iselin. Check out the historical temperatures and precipitation over the past 10 years on this day.
December weather comparison
| Iselin | New York | |
|---|---|---|
| Average temperature | 5°C | 9°C |
| Max. temperature | 9°C | 12°C |
| Min. temperature | -7°C | -5°C |
| Total precipitation | 101 mm | 133 mm |
| Rainy days | 13 days | 17 days |
| Total snowfall | 11 cm | 9,7 cm |
| Snowy days | 5 days | 3 days |
Start of December
The month of December starts in Iselin with cold temps, averaging around 6°C during the day and nights around 0°C.
Mid December
By mid-December, daytime temps drop to around 4°C, with nights around -3°C. During this part of the month, you might see regular precipitation, but there will also be some sunny days.
End of December
By the end of December, the average daytime temperature in Iselin is around 8°C, while nighttime temps are about 0°C. A shower might pop up, but overall, the weather will be dry and sunny.
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UV index
The UV index is a maximum of 4 this month. That's a moderate value on the intensity scale of 1 to 11. Unprotected skin can burn in about 30 minutes.
Check out the climate of Iselin for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in December in Iselin, Pennsylvania. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in December in Iselin
Temperature in December in Iselin over the years
Precipitation charts
These charts show the average amount of precipitation in December in Iselin, Pennsylvania. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in December in Iselin
Total precipitation in December in Iselin over the years
Daily Snowfall in December in Iselin
Snowfall in December in Iselin per year
Daily UV index in December in Iselin
This chart shows the average daily UV index in December in Iselin, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in December in Iselin
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Average weather in Iselin by month
Click on a month below to see detailed weather info for Iselin. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.