Mercer County (Princeton)
December
Weather in Mercer County, New Jersey for December 2026
Your guide to Mercer County weather in December - trends and predictions
With an average of 5 snowy days, Mercer County usually enjoys a light touch of snow in December.
In general, the average temperature in Mercer County at the beginning of December is 3 °C. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 6 °C by the end of December.
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Snow Forecast ❄️
Temperatures
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14
Dry days
12
Rainy days
5
Snow days
5°/-1°
Temperatures
18 km/h
Avg max wind
74 %
Avg humidity
Mercer County Weather December
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Temperatures trend during December in Mercer County
See the weather trend as well as the moving average line
December weather in Mercer County day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Dec. 1 |  Overcast | 3° /-3° | 0 mm | 0 cm | |
| Dec. 2 |  Sunny | 4° /-3° | 59 mm | 0 cm | |
| Dec. 3 | Sunny | 4° /-3° | 0 mm | 0 cm | |
| Dec. 4 | Overcast | 3° /-4° | 0 mm | 0 cm | |
| Dec. 5 |  Heavy snow | 2° /-4° | 10 mm | 3.3 cm | |
| Dec. 6 |  Cloudy | 1° /-3° | 0 mm | 0 cm | |
| Dec. 7 |  Partly cloudy | 4° /-3° | 0 mm | 0 cm | |
| Dec. 8 | Overcast | 5° /-2° | 0 mm | 0 cm | |
| Dec. 9 |  Fog | 6° /-2° | 8.2 mm | 0 cm | |
| Dec. 10 |  Light rain shower | 10° /2° | 12.1 mm | 0 cm | |
| Dec. 11 | Heavy snow | 8° /2° | 28.5 mm | 0.3 cm | |
| Dec. 12 | Partly cloudy | 4° /-2° | 2.9 mm | 0 cm | |
| Dec. 13 | Overcast | 3° /-3° | 0 mm | 0 cm | |
| Dec. 14 | Cloudy | 2° /-4° | 4.5 mm | 2.6 cm | |
| Dec. 15 | Overcast | 4° /-4° | 0 mm | 0 cm | |
| Dec. 16 | Overcast | 7° /-1° | 4.9 mm | 0 cm | |
| Dec. 17 |  Light rain | 9° /2° | 12.3 mm | 0 cm | |
| Dec. 18 |  Moderate rain | 9° /-1° | 16.2 mm | 0 cm | |
| Dec. 19 |  Light snow showers | 7° /0° | 14.9 mm | 0 cm | |
| Dec. 20 | Sunny | 4° /-2° | 6.3 mm | 0 cm | |
| Dec. 21 | Overcast | 4° /-3° | 0 mm | 0 cm | |
| Dec. 22 | Overcast | 1° /-5° | 0 mm | 0 cm | |
| Dec. 23 | Overcast | 3° /-3° | 0 mm | 0 cm | |
| Dec. 24 | Light drizzle | 5° /0° | 0.2 mm | 0 cm | |
| Dec. 25 | Cloudy | 5° /0° | 0 mm | 0 cm | |
| Dec. 26 | Mist | 3° /-4° | 0.7 mm | 0.5 cm | |
| Dec. 27 | Moderate rain | 5° /0° | 16.5 mm | 6.3 cm | |
| Dec. 28 | Fog | 6° /1° | 21.1 mm | 0 cm | |
| Dec. 29 | Patchy rain possible | 11° /3° | 2.5 mm | 0 cm | |
| Dec. 30 | Overcast | 7° /1° | 12.8 mm | 0 cm | |
| Dec. 31 | Sunny | 5° /-2° | 0 mm | 0 cm | |
| Next | |||||
Important Notice
Our weather forecast for Mercer County in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Mercer County forecast closer to your planned date for the most up-to-date weather information.
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Mercer County in December - FAQ
What are the expected maximum and minimum temperatures in Mercer County during December?
Brace for cold days with temperatures not exceeding 5° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.
How much rainfall should be expected in Mercer County during December?
Significant rainfall exceeding 233.8 mm is expected in Mercer County during December, occurring over more than 12 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Mercer County in December 2026?
Mercer County experiences an average snowfall of 13.1667 cm during December, occurring over 5 days.
What are the typical wind conditions in Mercer County during December?
The average wind speed in Mercer County during December is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
Mercer County snow forecast December 2026
Track daily snowfall levels and discover Mercer County’s snowy potential this December ❄️
On average, Mercer County sees 5 snowy days during December, with approximately 13.2 cm of total snowfall.
December rainfall patterns in Mercer County
Explore the daily rainfall trends and prepare for Mercer Countys December weather 💧
Typically, Mercer County has 12 rainy days in December with a total of 233.8 mm of rainfall.
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Where is Mercer County?Get accurate weather forecasts for Mercer County, located at latitude 40.349 and longitude -74.659. Stay updated with localized weather information tailored for Mercer County.
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