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Weather in New Castle County, Delaware for December 2025

Your guide to New Castle County weather in December - trends and predictions

    Snow Forecast ❄️

  • With an average of 2 snowy days, New Castle County usually enjoys a light touch of snow in December.
    According to New Castle County snow forecast for December 2025, no snow is expected at the beginning of the month.

    • Temperatures

  • The forecast for the first days of December 2025 in New Castle County predicts a temperature of 9.4 °F, which is slightly above the historical average.

  • In general, the average temperature in New Castle County at the beginning of December is 6.4 °F. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 9.1 °F by the end of December.

    • Rain 🌧️

  • The climate of New Castle County in December is notably wet, with an average of 12 rainy days, and a total of 215.9 mm of precipitation.

    • More

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

Average dry days
17
Dry days
Average rainy days
12
Rainy days
Average snowy days
2
Snow days
Average temperatures
7°/1°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
75 %
Avg humidity

New Castle County Weather December

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

Temperatures trend during December in New Castle County

See the weather trend as well as the moving average line

December weather in New Castle County day by day

Click on a date for more information
November January
Date Weather Temperatures Rain Snow More
Dec. 1 Sunny
Sunny
 6° /-3° 0 mm 0 cm
Dec. 2 Sunny
Sunny
 11° /0° 0 mm 0 cm
Dec. 3 Patchy rain possible
Patchy rain possible
 9° /5° 1.8 mm 0 cm
Dec. 4 Sunny
Sunny
 6° /-1° 0 mm 0 cm
Dec. 5 Mist
Mist
 5° /-1° 0 mm 0 cm
Dec. 6 Patchy rain possible
Patchy rain possible
 4° /-2° 0 mm 0 cm
Dec. 7 Overcast
Overcast
 4° /-3° 0 mm 0 cm
Dec. 8 Partly cloudy
Partly cloudy
 12° /0° 0 mm 0 cm
Dec. 9 Fog
Fog
 9° /0° 10.8 mm 0 cm
Dec. 10 Light rain shower
Light rain shower
 13° /3° 14.9 mm 0 cm
Dec. 11 Moderate snow
Moderate snow
 10° /2° 56.8 mm 0 cm
Dec. 12 Partly cloudy
Partly cloudy
 5° /-1° 0 mm 0 cm
Dec. 13 Overcast
Overcast
 3° /-1° 0 mm 0 cm
Dec. 14 Cloudy
Cloudy
 3° /-4° 0 mm 0 cm
Dec. 15 Sunny
Sunny
 6° /-2° 0 mm 0 cm
Dec. 16 Overcast
Overcast
 10° /2° 3.5 mm 0 cm
Dec. 17 Light rain
Light rain
 13° /6° 21.5 mm 0 cm
Dec. 18 Moderate rain
Moderate rain
 11° /2° 19.8 mm 0 cm
Dec. 19 Overcast
Overcast
 5° /0° 2.1 mm 0.1 cm
Dec. 20 Sunny
Sunny
 5° /-2° 0 mm 0 cm
Dec. 21 Sunny
Sunny
 4° /-2° 1.5 mm 1.1 cm
Dec. 22 Overcast
Overcast
 2° /-4° 0 mm 0 cm
Dec. 23 Overcast
Overcast
 3° /-4° 0 mm 0 cm
Dec. 24 Light drizzle
Light drizzle
 6° /0° 2.7 mm 0.8 cm
Dec. 25 Partly cloudy
Partly cloudy
 6° /2° 0 mm 0 cm
Dec. 26 Patchy rain possible
Patchy rain possible
 7° /0° 0 mm 0 cm
Dec. 27 Heavy rain
Heavy rain
 8° /2° 18.3 mm 0 cm
Dec. 28 Fog
Fog
 10° /5° 29.6 mm 0 cm
Dec. 29 Patchy rain possible
Patchy rain possible
 14° /5° 0.8 mm 0 cm
Dec. 30 Overcast
Overcast
 10° /4° 19.8 mm 0 cm
Dec. 31 Partly cloudy
Partly cloudy
 9° /0° 0 mm 0 cm
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Important Notice
Our weather forecast for New Castle 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 New Castle County forecast closer to your planned date for the most up-to-date weather information.
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New Castle County in December - FAQ

What are the expected maximum and minimum temperatures in New Castle County during December?
Prepare for cooler days with highs just around 7° and colder nights, dipping below 1°.
How much rainfall should be expected in New Castle County during December?
Significant rainfall exceeding 215.9 mm is expected in New Castle County during December, occurring over more than 12 days. Preparing for wet conditions is recommended in your planning.
Will it snow in New Castle County in December 2025?
New Castle County experiences an average snowfall of 1.99 cm during December, occurring over 2 days.
What are the typical wind conditions in New Castle County during December?
The average wind speed in New Castle County during December is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

New Castle County snow forecast December 2025

Track daily snowfall levels and discover New Castle County’s snowy potential this December ❄️
On average, New Castle County sees 2 snowy days during December, with approximately 2 cm of total snowfall.

December rainfall patterns in New Castle County

Explore the daily rainfall trends and prepare for New Castle Countys December weather 💧
Typically, New Castle County has 12 rainy days in December with a total of 215.9 mm of rainfall.
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Location coordinates Where is New Castle County?

Get accurate weather forecasts for New Castle County, located at latitude 39.684 and longitude -75.75. Stay updated with localized weather information tailored for New Castle County.

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