Philadelphia Weather in December
Philadelphia in December sees low daytime temperatures of 9°C (48°F) and nighttime lows of 1°C (34°F). Rainfall is fairly high this month at around 123 mm (4.8 in), so pack a rain jacket to stay dry.
Rainfall in Philadelphia in December
Analyzing past climate data, one can expect approximately 12 days of rain, averaging 123 mm (4.8 in). When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in Philadelphia in December
In December, Philadelphia sees low temperatures, with highs of 9°C (48°F). Nights drop to around 1°C (34°F). December is part of winter. Temperatures remain on the cold side all day. A proper warm jacket is worth having, not just for evenings. With lows around 1°C (34°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Philadelphia in December
The area experiences a moderate amount of sunshine, with approximately 140 hours of sunlight expected. This means a decent mix of sun and overcast.
Average water temperature in December
The water temperature is only 9°C (48°F) this month — cold enough that most people will want to stay out. Hardy swimmers may manage a quick dip, but it won't be comfortable.December in Philadelphia has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Philadelphia's climate page.
Philadelphia Temperature in December
Min Temperature
1°C (34°F)
Max Temperature
9°C (48°F)
Water Temperature
9°C (48°F)
Chance of Rain
38%
Precipitation
123 mm (4.8 in)
Rainy days
12 days
Humidity
67%
Sunshine
140 hours
Percentage Sunshine
48%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Philadelphia typically drop from around 9°C (48°F) at the start of December to approximately 6°C (43°F) by the end. Nights are very cold, with lows typically ranging from -3°C (27°F) to 2°C (36°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for Philadelphia in December
Browse day-by-day weather records for Philadelphia spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Philadelphia historical weather extremes in December
The extremes listed below come from historical weather data collected in Philadelphia from 1976 through 2025.
- The warmest day in December was on December 13, 2015, with a maximum of 22°C (72°F).
Best Places in the United States of America in December
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in December →
perfect weather
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unpleasant
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What to Wear in Philadelphia in December
Cold weather calls for smart layering in December. A thermal base layer makes a huge difference in staying warm. Add a wool sweater or fleece, then a wind-resistant outer jacket. Prepare for significant rainfall with proper waterproof clothing and shoes. With water temperatures around 9°C (48°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Philadelphia in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Philadelphia's climate page.
Temperature Rainfall Sunshine Humidity Water Temp
See the full Philadelphia climate overview or explore weather in the United States of America.
