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Mercer County (Princeton)
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United States weather

Weather in Mercer County, New Jersey for December 2025

Your guide to Mercer County weather in December - trends and predictions

    Snow Forecast ❄️

  • With an average of 2 snowy days, Mercer County usually enjoys a light touch of snow in December.
    According to Mercer County snow forecast for December 2025, 1 snowy day is expected until the end of the month at Tuesday, December 23.

    • Temperatures

  • Until now, December 2025 in Mercer County is cooler than usual, with temperatures averaging 1.7 °F, this is -2.9 °F below the typical seasonal average.

  • The forecast for the next days in Mercer County predicts temperatures to be around 6 °F, close to the historical average.

  • In general, the average temperature in Mercer County at the beginning of December is 3 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 7.4 °F by the end of December.

    • Rain 🌧️

  • The climate of Mercer County in December is notably wet, with an average of 11 rainy days, and a total of 221.6 mm of precipitation.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
18
Dry days
Average rainy days
11
Rainy days
Average snowy days
2
Snow days
Average temperatures
6°/0°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
73 %
Avg humidity

Mercer County Weather December

Move between months or click on a day
November
January
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
3°
2
Sunny
4°
3
Sunny
4°
4
Overcast
3°
5
Heavy snow
2°
6
Cloudy
1°
7
Partly cloudy
4°
8
Overcast
5°
9
Fog
6°
10
Light rain shower
10°
11
Heavy snow
8°
12
Partly cloudy
4°
13
Overcast
3°
14
Cloudy
2°
15
Overcast
4°
16
Overcast
7°
17
Light rain
9°
18
Moderate rain
11°
19
Heavy rain
13°
20
Sunny
1°
21
Partly cloudy
9°
22
Sunny
1°
23
Light freezing rain
2°
24
Sunny
2°
25
Moderate snow
3°
26
Patchy rain possible
15°
27
Sunny
8°
28
Patchy rain possible
7°
29
Patchy rain possible
9°
30
Sunny
4°
31
Sunny
6°

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

Click on a date for more information
November January
Date Weather Temperatures Rain Snow More
Dec. 1 Overcast
Overcast
 3° /-3° 0 mm 0 cm
Dec. 2 Sunny
Sunny
 4° /-3° 59 mm 0 cm
Dec. 3 Sunny
Sunny
 4° /-3° 0 mm 0 cm
Dec. 4 Overcast
Overcast
 3° /-4° 0 mm 0 cm
Dec. 5 Heavy snow
Heavy snow
 2° /-4° 10 mm 3.3 cm
Dec. 6 Cloudy
Cloudy
 1° /-3° 0 mm 0 cm
Dec. 7 Partly cloudy
Partly cloudy
 4° /-3° 0 mm 0 cm
Dec. 8 Overcast
Overcast
 5° /-2° 0 mm 0 cm
Dec. 9 Fog
Fog
 6° /-2° 8.2 mm 0 cm
Dec. 10 Light rain shower
Light rain shower
 10° /2° 12.1 mm 0 cm
Dec. 11 Heavy snow
Heavy snow
 8° /2° 28.5 mm 0.3 cm
Dec. 12 Partly cloudy
Partly cloudy
 4° /-2° 2.9 mm 0 cm
Dec. 13 Overcast
Overcast
 3° /-3° 0 mm 0 cm
Dec. 14 Cloudy
Cloudy
 2° /-4° 4.5 mm 2.6 cm
Dec. 15 Overcast
Overcast
 4° /-4° 0 mm 0 cm
Dec. 16 Overcast
Overcast
 7° /-1° 4.9 mm 0 cm
Dec. 17 Light rain
Light rain
 9° /2° 12.3 mm 0 cm
Dec. 18 Moderate rain
Moderate rain
 11° /3° 24.2 mm 0 cm
Dec. 19 Heavy rain
Heavy rain
 13° /-2° 26.3 mm 0 cm
Dec. 20 Sunny
Sunny
 1° /-5° 0 mm 0 cm
Dec. 21 Partly cloudy
Partly cloudy
 9° /-3° 0 mm 0 cm
Dec. 22 Sunny
Sunny
 1° /-4° 0 mm 0 cm
Dec. 23 Light freezing rain
Light freezing rain
 2° /-2° 0.2 mm 0.2 cm
Dec. 24 Sunny
Sunny
 2° /-4° 0 mm 0 cm
Dec. 25 Moderate snow
Moderate snow
 3° /-4° 1 mm 0 cm
Dec. 26 Patchy rain possible
Patchy rain possible
 15° /5° 0.1 mm 0 cm
Dec. 27 Sunny
Sunny
 8° /3° 0 mm 0 cm
Dec. 28 Patchy rain possible
Patchy rain possible
 7° /4° 1.1 mm 0 cm
Dec. 29 Patchy rain possible
Patchy rain possible
 9° /-1° 0.2 mm 0 cm
Dec. 30 Sunny
Sunny
 4° /-2° 0 mm 0 cm
Dec. 31 Sunny
Sunny
 6° /-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?
Prepare for cooler days with highs just around 6° and colder nights, dipping below 0°.
How much rainfall should be expected in Mercer County during December?
Significant rainfall exceeding 221.6 mm is expected in Mercer County during December, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Mercer County in December 2025?
Mercer County experiences an average snowfall of 7.185 cm during December, occurring over 2 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 2025

Track daily snowfall levels and discover Mercer County’s snowy potential this December ❄️
On average, Mercer County sees 2 snowy days during December, with approximately 7.2 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 11 rainy days in December with a total of 221.6 mm of rainfall.
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Princeton
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Location coordinates 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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