Philadelphia weather in December
December is one of the least pleasant months in Philadelphia: highs of 6°C (43°F) and about 111 mm (4.4 in) of rain on average. Nights average -2°C (28°F) and cloud cover 63% (NASA POWER, 2001–2025 averages). It is the 4th wettest month of the year and the 3rd coolest. Compared with November, it is cooler and wetter; January brings highs of 3°C (38°F) and 78 mm (3.1 in) of rain.
Is December a good time to visit Philadelphia?
least pleasant month Weather score 29/100.
December is one of the least pleasant months for weather in Philadelphia. For better conditions, consider Apr–Oct.
Does it rain a lot in Philadelphia in December?
Some rain is normal: about 111 mm (4.4 in) falls in an average December. It is the 4th wettest month of the year.
How warm is Philadelphia in December?
Days average 6°C (43°F) and nights -2°C (28°F).
Philadelphia weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 3°C (38°F) | -5°C (22°F) | 78 mm | 62% | least pleasant |
| February | 5°C (41°F) | -5°C (24°F) | 78 mm | 60% | least pleasant |
| March | 10°C (50°F) | -1°C (30°F) | 100 mm | 60% | least pleasant |
| April | 17°C (62°F) | 5°C (41°F) | 97 mm | 58% | best |
| May | 22°C (72°F) | 11°C (51°F) | 96 mm | 61% | best |
| June | 27°C (80°F) | 16°C (61°F) | 121 mm | 56% | best |
| July | 30°C (86°F) | 19°C (67°F) | 124 mm | 53% | best |
| August | 29°C (85°F) | 19°C (66°F) | 121 mm | 52% | best |
| September | 26°C (79°F) | 15°C (58°F) | 102 mm | 50% | best |
| October | 19°C (66°F) | 8°C (47°F) | 110 mm | 53% | best |
| November | 12°C (54°F) | 2°C (35°F) | 90 mm | 54% | fair |
| December | 6°C (43°F) | -2°C (28°F) | 111 mm | 63% | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months