Allegheny County (Pittsburgh)
December
Weather in Allegheny County for December 2025
Your guide to Allegheny County weather in December - trends and predictions
Allegheny County typically experiences moderate snowfall in December, with an average of 9 snowy days.
In general, the average temperature in Allegheny County at the beginning of December is 3.7 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 6.9 °F by the end of December.
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Snow Forecast ❄️
Temperatures
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14
Dry days
8
Rainy days
9
Snow days
6°/0°
Temperatures
15 km/h
Avg max wind
74 %
Avg humidity
Allegheny County Weather December
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  4° | 2  7° | 3 6° | 4  3° | 5  2° | 6  1° | |
| 7 3° | 8  10° | 9 12° | 10  12° | 11 4° | 12  4° | 13 2° |
| 14 4° | 15 5° | 16 10° | 17 10° | 18 5° | 19 1° | 20 3° |
| 21  2° | 22 4° | 23  5° | 24  -0° | 25 3° | 26 4° | 27 5° |
| 28 10° | 29 10° | 30 8° | 31  8° |
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Temperatures trend during December in Allegheny County
See the weather trend as well as the moving average line
December weather day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Dec. 1 | Light rain | 4° /0° | 1.4 mm | 0 cm | |
| Dec. 2 | Patchy rain possible | 7° /1° | 0.1 mm | 0 cm | |
| Dec. 3 | Light rain shower | 6° /1° | 8.4 mm | 0 cm | |
| Dec. 4 | Overcast | 3° /0° | 0.7 mm | 0.5 cm | |
| Dec. 5 | Moderate or heavy snow showers | 2° /-2° | 1.5 mm | 1.2 cm | |
| Dec. 6 | Light snow showers | 1° /-2° | 0.3 mm | 0.2 cm | |
| Dec. 7 | Overcast | 3° /-2° | 0 mm | 0 cm | |
| Dec. 8 | Partly cloudy | 10° /1° | 0 mm | 0 cm | |
| Dec. 9 | Patchy rain possible | 12° /4° | 17 mm | 0 cm | |
| Dec. 10 | Moderate or heavy rain with thunder | 12° /4° | 46.9 mm | 0 cm | |
| Dec. 11 | Moderate or heavy snow showers | 4° /0° | 1.5 mm | 1.2 cm | |
| Dec. 12 | Sunny | 4° /-3° | 0 mm | 0 cm | |
| Dec. 13 | Partly cloudy | 2° /-3° | 0 mm | 0 cm | |
| Dec. 14 | Sunny | 4° /-4° | 0 mm | 0 cm | |
| Dec. 15 | Sunny | 5° /-2° | 13.9 mm | 0 cm | |
| Dec. 16 | Sunny | 10° /1° | 33.6 mm | 0 cm | |
| Dec. 17 | Light rain | 10° /5° | 3.3 mm | 0 cm | |
| Dec. 18 | Moderate or heavy snow showers | 5° /0° | 41 mm | 0.5 cm | |
| Dec. 19 | Light snow showers | 1° /-1° | 0.4 mm | 0.3 cm | |
| Dec. 20 | Partly cloudy | 3° /-2° | 0 mm | 0 cm | |
| Dec. 21 | Cloudy | 2° /-2° | 0 mm | 0 cm | |
| Dec. 22 | Patchy moderate snow | 4° /-2° | 1.9 mm | 0.4 cm | |
| Dec. 23 | Moderate snow | 5° /-6° | 2.8 mm | 0.8 cm | |
| Dec. 24 | Light freezing rain | 0° /-4° | 2.1 mm | 1.4 cm | |
| Dec. 25 | Overcast | 3° /-2° | 0.1 mm | 0 cm | |
| Dec. 26 | Light freezing rain | 4° /-2° | 1.4 mm | 0 cm | |
| Dec. 27 | Overcast | 5° /-1° | 11.5 mm | 0 cm | |
| Dec. 28 | Overcast | 10° /2° | 3.6 mm | 0 cm | |
| Dec. 29 | Cloudy | 10° /2° | 6 mm | 0 cm | |
| Dec. 30 | Overcast | 8° /3° | 0.3 mm | 0.2 cm | |
| Dec. 31 | Heavy rain at times | 8° /3° | 5 mm | 0 cm | |
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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.
Allegheny County in December - FAQ
What are the expected maximum and minimum temperatures in Allegheny 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 Allegheny County during December?
Significant rainfall exceeding 117.9 mm is expected in Allegheny County during December, occurring over more than 8 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 7.485 cm during December, occurring over 9 days.
What are the typical wind conditions in Allegheny County during December?
The average wind speed in Allegheny County during December is 15 km/h, suggesting breezy to windy conditions, depending on your activities.
Allegheny County snow forecast December 2025
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December rainfall patterns in Allegheny County
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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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