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United States weather

Weather in New Castle County, Delaware for December 2026

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

    Snow Forecast ❄️

  • With an average of 4 snowy days, New Castle County usually enjoys a light touch of snow in December.

    • Temperatures

  • In general, the average temperature in New Castle County at the beginning of December is 3 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 1.9 °C by the end of December.

    • More

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

Average dry days
24
Dry days
Average rainy days
3
Rainy days
Average snowy days
4
Snow days
Average temperatures
3°/-3°
Temperatures
Average wind speed
20 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
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Sunny
3°
2
Heavy rain
3°
3
Sunny
4°
4
Mist
6°
5
Patchy moderate snow
0°
6
Overcast
3°
7
Mist
2°
8
Overcast
0°
9
Partly cloudy
2°
10
Overcast
4°
11
Partly cloudy
1°
12
Overcast
1°
13
Overcast
3°
14
Heavy snow
1°
15
Overcast
-1°
16
Cloudy
1°
17
Overcast
4°
18
Fog
7°
19
Moderate or heavy rain with thunder
12°
20
Overcast
0°
21
Overcast
5°
22
Partly cloudy
1°
23
Mist
2°
24
Overcast
6°
25
Overcast
2°
26
Overcast
-1°
27
Mist
0°
28
Mist
0°
29
Moderate rain at times
10°
30
Overcast
0°
31
Overcast
2°

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
 3° /-1° 0 mm 0 cm
Dec. 2 Heavy rain
Heavy rain
 3° /0° 100.8 mm 0 cm
Dec. 3 Sunny
Sunny
 4° /-2° 0 mm 0 cm
Dec. 4 Mist
Mist
 6° /-2° 0 mm 0 cm
Dec. 5 Patchy moderate snow
Patchy moderate snow
 0° /-5° 3.3 mm 2.4 cm
Dec. 6 Overcast
Overcast
 3° /-1° 0 mm 0 cm
Dec. 7 Mist
Mist
 2° /-3° 0 mm 0 cm
Dec. 8 Overcast
Overcast
 0° /-2° 0 mm 0 cm
Dec. 9 Partly cloudy
Partly cloudy
 2° /-6° 0 mm 0 cm
Dec. 10 Overcast
Overcast
 4° /0° 0 mm 0 cm
Dec. 11 Partly cloudy
Partly cloudy
 1° /-2° 0 mm 0 cm
Dec. 12 Overcast
Overcast
 1° /-2° 0 mm 0 cm
Dec. 13 Overcast
Overcast
 3° /-3° 0 mm 0 cm
Dec. 14 Heavy snow
Heavy snow
 1° /-4° 20.2 mm 13.4 cm
Dec. 15 Overcast
Overcast
 -1° /-7° 0 mm 0 cm
Dec. 16 Cloudy
Cloudy
 1° /-4° 0 mm 0 cm
Dec. 17 Overcast
Overcast
 4° /-2° 0 mm 0 cm
Dec. 18 Fog
Fog
 7° /-4° 0 mm 0 cm
Dec. 19 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 12° /-1° 49.3 mm 0 cm
Dec. 20 Overcast
Overcast
 0° /-4° 0 mm 0 cm
Dec. 21 Overcast
Overcast
 5° /-2° 0 mm 0 cm
Dec. 22 Partly cloudy
Partly cloudy
 1° /-4° 0 mm 0 cm
Dec. 23 Mist
Mist
 2° /0° 0 mm 0 cm
Dec. 24 Overcast
Overcast
 6° /1° 0 mm 0 cm
Dec. 25 Overcast
Overcast
 2° /0° 0 mm 0 cm
Dec. 26 Overcast
Overcast
 -1° /-5° 2 mm 1.5 cm
Dec. 27 Mist
Mist
 0° /-1° 15.5 mm 8.1 cm
Dec. 28 Mist
Mist
 0° /-5° 0 mm 0 cm
Dec. 29 Moderate rain at times
Moderate rain at times
 10° /0° 3.2 mm 0 cm
Dec. 30 Overcast
Overcast
 0° /-3° 0 mm 0 cm
Dec. 31 Overcast
Overcast
 2° /-4° 0 mm 0 cm
Next
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?
Brace for cold days with temperatures not exceeding 3° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.

How much rainfall should be expected in New Castle County during December?
Significant rainfall exceeding 194.3 mm is expected in New Castle County during December, occurring over more than 3 days. Preparing for wet conditions is recommended in your planning.

Will it snow in New Castle County in December 2026?
New Castle County experiences an average snowfall of 25.29 cm during December, occurring over 4 days.

What are the typical wind conditions in New Castle County during December?
The average wind speed in New Castle County during December is 20 km/h, suggesting breezy to windy conditions, depending on your activities.

New Castle County snow forecast December 2026

Track daily snowfall levels and discover New Castle County’s snowy potential this December ❄️
On average, New Castle County sees 4 snowy days during December, with approximately 25.3 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 3 rainy days in December with a total of 194.3 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 39.746 and longitude -75.547. Stay updated with localized weather information tailored for New Castle County.

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