Weather in Philadelphia in January 2025
- January is usually the coldest month of the year in Philadelphia;
Average weather
Average temperature in Philadelphia in January
The temperature in January is +10°C on average, with a range between a maximum of +18°C during the day and a minimum of -2°C at night.
The average maximum temperature goes down 15% by the end of the month, compared with the beginning of the month, from +13°C to +10°C.
Is Philadelphia warm or cold in January?
Philadelphia is typically cool in January.
Maximum temperatures go down compared to the previous month from +8°C to +5°C. The minimum temperature also goes down from 0°C to -2°C.
Pack a sweater and a jacket as there will be cooler temperatures.
January is the coldest month in Philadelphia, here is the comparison with other months:
Climate in Philadelphia in January
| December | January | February | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +8°C | +5°C | +7°C | ||||
| Min. temperature | ||||||
| -17°C | -24°C | -22°C | ||||
| Max. temperature | ||||||
| +23°C | +23°C | +25°C | ||||
| Rainfall | ||||||
| 81 mm | 57 mm | 49 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Humidity | ||||||
| 69% | 67% | 64% | ||||
| Air pressure | ||||||
| 1018 HPa | 1017 HPa | 1017 HPa | ||||
| Sunny days | ||||||
| 4 | 4 | 4 | ||||
| Cloudy days | ||||||
| 14 | 14 | 11 | ||||
| Rainy days | ||||||
| 9 | 7 | 7 | ||||
| Snowy days | ||||||
| 3 | 6 | 6 | ||||
January weather is still as ok as in December. It’s getting colder in January. From +8°C in the day, the average maximum temperature lowers to +5°C. As January arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 81 mm to 57 mm. It feels drier, as humidity decreases from 69% to 67%. The average wind speed doesn’t change much during January, staying around 3 m/s. The amount of sunny days stay about the same, averaging 4 sunny days during the month.
February brings much the same weather, it remains ok.
Wind
The average wind speed is 4 m/s getting up to 8 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Philadelphia is gradually increasing during January, going from 3 m/s to 3 m/s over the course of the month.
Rain
Snow
January is one of the snowiest months in Philadelphia.
Here’s how January is compared with other months in the amount of snow, total mm:
How was the weather last January in Philadelphia?
Climate Change over Years
The climate in Philadelphia in January has not changed much over the last 43 years.
The average temperature was the lowest in 1996 (+17°C) and the highest in 2012 (+20°C). The driest year was 2001 with only 685 mm of rainfall, and the wettest year was 2023 with 1758 mm.
FAQ
Is January a good time to visit Philadelphia?
Can you sunbathe in Philadelphia in January?
Is Philadelphia rainy in January?
Is it sunny in Philadelphia in January?
Other cities in USA
Monthly weather in Philadelphia
Source of the data
For this page, we’ve looked at the typical weather in Philadelphia, based on historical hourly weather data from January 1, 1979, to December 31, 2022.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.