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United States weather

Weather in Allegheny County, Pennsylvania for December 2026

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

    Snow Forecast ❄️

  • With an average of 5 snowy days, Allegheny County usually enjoys a light touch of snow in December.

    • Temperatures

  • In general, the average temperature in Allegheny County at the beginning of December is 2.7 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 5.8 °C by the end of December.

    • More

  • Is December a good time to visit Allegheny County? check out the best time to travel to Allegheny County page.

  • ✨ Is December a good time to visit Allegheny County? – Ask the AI Weatherman

Average dry days
20
Dry days
Average rainy days
6
Rainy days
Average snowy days
5
Snow days
Average temperatures
4°/-1°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
78 %
Avg humidity

Allegheny County Weather December

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

Temperatures trend during December in Allegheny County

See the weather trend as well as the moving average line

December weather in Allegheny County day by day

Click on a date for more information
November January
Date Weather Temperatures Rain Snow More
Dec. 1 Light rain
Light rain
 2° /0° 0.9 mm 0 cm
Dec. 2 Moderate rain
Moderate rain
 5° /1° 13.5 mm 9.7 cm
Dec. 3 Light rain
Light rain
 4° /0° 5.6 mm 0 cm
Dec. 4 Overcast
Overcast
 2° /-2° 0.5 mm 0.3 cm
Dec. 5 Patchy rain possible
Patchy rain possible
 1° /-4° 1 mm 0.8 cm
Dec. 6 Overcast
Overcast
 1° /-2° 0.2 mm 0.2 cm
Dec. 7 Overcast
Overcast
 3° /-1° 0 mm 0 cm
Dec. 8 Partly cloudy
Partly cloudy
 6° /-1° 0 mm 0 cm
Dec. 9 Moderate rain
Moderate rain
 8° /1° 11.3 mm 0 cm
Dec. 10 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 9° /3° 33.3 mm 0.9 cm
Dec. 11 Light snow
Light snow
 2° /-2° 1 mm 0.8 cm
Dec. 12 Overcast
Overcast
 2° /-3° 0 mm 0 cm
Dec. 13 Light snow
Light snow
 1° /-3° 1.2 mm 0 cm
Dec. 14 Light snow
Light snow
 1° /-5° 1.4 mm 1 cm
Dec. 15 Light rain
Light rain
 2° /-4° 9.2 mm 0 cm
Dec. 16 Moderate rain
Moderate rain
 8° /-1° 22.4 mm 0 cm
Dec. 17 Patchy rain possible
Patchy rain possible
 8° /3° 2.2 mm 0 cm
Dec. 18 Heavy rain
Heavy rain
 6° /0° 27.3 mm 0.3 cm
Dec. 19 Light rain
Light rain
 3° /-2° 5.2 mm 0.2 cm
Dec. 20 Partly cloudy
Partly cloudy
 2° /-3° 0 mm 0 cm
Dec. 21 Overcast
Overcast
 3° /-3° 0 mm 0 cm
Dec. 22 Patchy moderate snow
Patchy moderate snow
 3° /-4° 1.4 mm 0.3 cm
Dec. 23 Light snow
Light snow
 4° /-5° 4.3 mm 0.9 cm
Dec. 24 Light freezing rain
Light freezing rain
 1° /-3° 1.6 mm 1.1 cm
Dec. 25 Light rain
Light rain
 3° /-2° 2.8 mm 0 cm
Dec. 26 Light freezing rain
Light freezing rain
 3° /-2° 6.8 mm 0.9 cm
Dec. 27 Light rain
Light rain
 4° /0° 9.1 mm 0 cm
Dec. 28 Light rain
Light rain
 10° /2° 2.7 mm 0 cm
Dec. 29 Light rain
Light rain
 10° /0° 5.9 mm 0 cm
Dec. 30 Overcast
Overcast
 5° /2° 0.2 mm 0.2 cm
Dec. 31 Light rain
Light rain
 6° /1° 4.1 mm 0.2 cm
Next
Important Notice
Our weather forecast for Allegheny 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 Allegheny County forecast closer to your planned date for the most up-to-date weather information.
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Allegheny County in December - FAQ

What are the expected maximum and minimum temperatures in Allegheny County during December?
Brace for cold days with temperatures not exceeding 4° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.

How much rainfall should be expected in Allegheny County during December?
Significant rainfall exceeding 175.2 mm is expected in Allegheny County during December, occurring over more than 6 days. Preparing for wet conditions is recommended in your planning.

Will it snow in Allegheny County in December 2026?
Allegheny County experiences an average snowfall of 17.9 cm during December, occurring over 5 days.

What are the typical wind conditions in Allegheny County during December?
The average wind speed in Allegheny County during December is 16 km/h, suggesting breezy to windy conditions, depending on your activities.

Allegheny County snow forecast December 2026

Track daily snowfall levels and discover Allegheny County’s snowy potential this December ❄️
On average, Allegheny County sees 5 snowy days during December, with approximately 17.9 cm of total snowfall.

December rainfall patterns in Allegheny County

Explore the daily rainfall trends and prepare for Allegheny Countys December weather 💧
Typically, Allegheny County has 6 rainy days in December with a total of 175.2 mm of rainfall.
Top locations in Allegheny County
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Pittsburgh
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