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United States weather

Weather in Allegheny County, Pennsylvania for December 2025

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

    Snow Forecast ❄️

  • Allegheny County typically experiences moderate snowfall in December, with an average of 10 snowy days.
    According to Allegheny County snow forecast for December 2025, 2 snowy days are expected in the next 2 weeks. The closest date with snow is Saturday, December 13.

    • Temperatures

  • Until now, December 2025 in Allegheny County is cooler than usual, with temperatures averaging 0.8 °F, this is -3.5 °F below the typical seasonal average.

  • The forecast for the upcoming days in Allegheny County predicts a temperature of 6.9 °F, which is slightly above the historical average.

  • In general, the average temperature in Allegheny County at the beginning of December is 3 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 9.3 °F by the end of December.

    • More

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

Average dry days
9
Dry days
Average rainy days
12
Rainy days
Average snowy days
10
Snow days
Average temperatures
5°/0°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
77 %
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
3°
2
Patchy rain possible
5°
3
Light rain shower
5°
4
Overcast
2°
5
Overcast
2°
6
Overcast
1°
7
Overcast
3°
8
Partly cloudy
7°
9
Patchy rain possible
8°
10
Moderate or heavy rain with thunder
9°
11
Moderate or heavy snow showers
3°
12
Overcast
3°
13
Light freezing rain
0°
14
Moderate or heavy snow showers
-7°
15
Partly cloudy
-4°
16
Partly cloudy
0°
17
Light freezing rain
4°
18
Patchy rain possible
9°
19
Patchy rain possible
12°
20
Patchy rain possible
7°
21
Overcast
7°
22
Partly cloudy
9°
23
Patchy rain possible
19°
24
Patchy rain possible
17°
25
Patchy rain possible
7°
26
Moderate rain
17°
27
Overcast
5°
28
Overcast
10°
29
Cloudy
10°
30
Overcast
8°
31
Heavy rain at times
8°

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
 3° /0° 0.9 mm 0 cm
Dec. 2 Patchy rain possible
Patchy rain possible
 5° /1° 13.5 mm 9.7 cm
Dec. 3 Light rain shower
Light rain shower
 5° /0° 5.6 mm 0 cm
Dec. 4 Overcast
Overcast
 2° /-2° 0.5 mm 0.3 cm
Dec. 5 Overcast
Overcast
 2° /-4° 1 mm 0.8 cm
Dec. 6 Overcast
Overcast
 1° /-2° 0.2 mm 0.2 cm
Dec. 7 Overcast
Overcast
 3° /-2° 0 mm 0 cm
Dec. 8 Partly cloudy
Partly cloudy
 7° /-1° 0 mm 0 cm
Dec. 9 Patchy rain possible
Patchy rain possible
 8° /0° 11.3 mm 0 cm
Dec. 10 Moderate or heavy rain with thunder
Moderate or heavy rain with thunder
 9° /2° 33.3 mm 0.9 cm
Dec. 11 Moderate or heavy snow showers
Moderate or heavy snow showers
 3° /-2° 1 mm 0.8 cm
Dec. 12 Overcast
Overcast
 3° /-3° 0 mm 0 cm
Dec. 13 Light freezing rain
Light freezing rain
 0° /-6° 5.4 mm 1 cm
Dec. 14 Moderate or heavy snow showers
Moderate or heavy snow showers
 -7° /-9° 10.3 mm 7.5 cm
Dec. 15 Partly cloudy
Partly cloudy
 -4° /-8° 0 mm 0 cm
Dec. 16 Partly cloudy
Partly cloudy
 0° /-7° 0 mm 0 cm
Dec. 17 Light freezing rain
Light freezing rain
 4° /-3° 0.3 mm 0 cm
Dec. 18 Patchy rain possible
Patchy rain possible
 9° /5° 0.1 mm 0 cm
Dec. 19 Patchy rain possible
Patchy rain possible
 12° /7° 3.9 mm 0 cm
Dec. 20 Patchy rain possible
Patchy rain possible
 7° /4° 2.6 mm 0 cm
Dec. 21 Overcast
Overcast
 7° /4° 0 mm 0 cm
Dec. 22 Partly cloudy
Partly cloudy
 9° /2° 0 mm 0 cm
Dec. 23 Patchy rain possible
Patchy rain possible
 19° /8° 0.9 mm 0 cm
Dec. 24 Patchy rain possible
Patchy rain possible
 17° /5° 1.3 mm 0 cm
Dec. 25 Patchy rain possible
Patchy rain possible
 7° /3° 1.3 mm 0 cm
Dec. 26 Moderate rain
Moderate rain
 17° /7° 8.8 mm 0 cm
Dec. 27 Overcast
Overcast
 5° /-1° 11.5 mm 0 cm
Dec. 28 Overcast
Overcast
 10° /2° 3.6 mm 0 cm
Dec. 29 Cloudy
Cloudy
 10° /2° 6 mm 0 cm
Dec. 30 Overcast
Overcast
 8° /3° 0.3 mm 0.2 cm
Dec. 31 Heavy rain at times
Heavy rain at times
 8° /3° 5 mm 0 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 5° 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 204.6 mm is expected in Allegheny County during December, occurring over more than 12 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Allegheny County in December 2025?
Allegheny County experiences an average snowfall of 6.91667 cm during December, occurring over 10 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 2025

Track daily snowfall levels and discover Allegheny County’s snowy potential this December ❄️
On average, Allegheny County sees 10 snowy days during December, with approximately 6.9 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 12 rainy days in December with a total of 204.6 mm of rainfall.
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Pittsburgh
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Location coordinates Where is Allegheny County?

Get accurate weather forecasts for Allegheny County, located at latitude 40.441 and longitude -79.996. Stay updated with localized weather information tailored for Allegheny County.

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