Last updated: February 24, 2025
In January, the weather in Philadelphia reveals a striking contrast, as temperatures range from a maximum of 14°C (58°F) to a minimum of -33°C (-27°F), with an average temperature settling around -6°C (22°F). This month is characterized by high humidity levels, reaching up to 93%, and a substantial amount of precipitation totaling 86 mm (3.4 inches), spread over approximately 12 rainy days. Such conditions create a dynamic winter atmosphere, where chilly air meets occasional bursts of moisture, influencing daily life and local activities.
In January, Philadelphia experiences a striking range of temperatures, starting with a bleak minimum of -33°C (-27°F) and reaching a more manageable maximum of 14°C (58°F). The month averages a chilly -6°C (22°F), showcasing a typical mid-winter chill that sets the tone for the season. This pattern follows through into February, where temperatures slightly improve, yet the minimum remains notably low at -27°C (-16°F). As the months progress into March and April, a clear trend emerges: temperatures steadily rise, with March introducing milder averages around 0°C (32°F), and April further warming up to a pleasant 7°C (44°F). By this stage, the transition from the harsh winter cold to the invigorating spring warmth is palpable, paving the way for an eventual rise in temperatures to more inviting levels as summer approaches.
In January, Philadelphia experiences a moderate precipitation level of 86 mm (3.4 in), spread over approximately 12 days of the month. These figures mark a typical winter pattern for the region, with precipitation tapering slightly in February to 84 mm (3.3 in) yet maintaining the same number of rainy days. As winter transitions into spring, March sees a slight uptick, bringing 88 mm (3.5 in) of rainfall, which hints at a gradual increase in moisture leading into the wetter months ahead. Notably, April and October stand out with significantly higher precipitation totals of 130 mm (5.1 in) and 160 mm (6.3 in), respectively, showcasing the seasonal peaks that characterize Philadelphia’s climate. The trend reflects a dynamic weather pattern where winter’s dampness gives way to the lush, rain-soaked spring, reminding residents of the region's climatic ebb and flow.
In January, Philadelphia experiences its peak humidity at a striking 93%, creating a damp chill that continues into February with similar levels. As winter gradually shifts to spring, the humidity begins to decline, dropping to 86% in March and further to 82% in April, offering a refreshing respite as warmer weather approaches. The trend continues through late spring and summer, where humidity steadily decreases, reaching its lowest point of 67% in August. Following the summer months, humidity starts to climb again, peaking at 89% in December as the winter chill sets in once more. This cyclical pattern highlights the city's transition through the seasons, with remarkably high humidity dominating the winter and early spring months, followed by a comfortable dry spell in the summer.
In January, Philadelphia experiences a low UV Index of 2, requiring about 45 minutes of exposure before burning. This trend of low UV levels carries into December as well, where the UV Index remains at 2. As we transition into February, the UV Index rises to 4, indicating a moderate exposure risk with a burn time of 30 minutes. The spring months see a gradual increase, with March maintaining a moderate level at 5. However, April marks a significant shift, with the UV Index jumping to a very high level of 8, dramatically reducing safe exposure to just 15 minutes. This trend continues through the summer months, where the UV Index peaks at 9 from May to August, emphasizing the importance of UV protection during this period. As we move into September, the Index dips to 7, categorized as high, followed by a return to more moderate values in October and November. For a detailed look at monthly variations and UV exposure in Philadelphia, check out Philadelphia UV Index.
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In January, Philadelphia experiences a modest 107 hours of sunshine, setting the tone for a winter season that gradually brightens as the months progress. Moving into February, the sun shines a bit longer with 145 hours, hinting at the approaching spring. By March, the sun begins to emerge more prominently, offering 223 hours of light, which further elevates spirits. April and May continue this positive trend, with 225 and 273 hours of sunshine respectively, marking a significant increase as nature awakens. The peak sunlit months arrive in June and July, showcasing an impressive 319 and 339 hours, providing plenty of outdoor opportunities. As summer wanes into August and September, the hours remain substantial at 326 and 281, though a gradual decline begins to set in. The shorter days of October and November bring 194 and 149 hours, reminding Philadelphians of the oncoming winter. Finally, December closes the year with 117 hours, reflecting the cycle of seasons that dance between the warmth of summer and the chill of winter. Overall, the steady rise in sunshine hours from the winter months into summer and the gradual decline back into winter illustrates Philadelphia's dynamic seasonal rhythm.
In Philadelphia, January ushers in a starkly chilly atmosphere, and the chances of enjoying bright, sunny days are quite modest, with a mere 24% likelihood of sunshine. This trend of limited sunlight continues into early February as it slightly increases to 26%, hinting at a gradual welcome towards spring. Comparatively, by March, the chances of sun rise significantly to 46%, showcasing a notable transition as the days grow longer and warmer. It's clear that while January may be gray and drizzly, Philadelphia's weather pattern soon transforms, allowing for more cheerful, sunlit days as the season progresses into spring.
In Philadelphia, January ushers in a winter landscape where daylight lingers for just nine hours, setting the stage for the gradual return of longer days. As February arrives, this fleeting daylight increases to ten hours, hinting at the promise of spring. By March, daylight expands further to eleven hours, and this upward trend gains momentum through April with thirteen hours, culminating in a vibrant fifteen hours of sunlight in both June and July. The summer provides a blissful respite before a subtle shift begins, bringing daylight down to thirteen hours in August and gradually tapering to twelve in September. As the season turns, the daylight shortens again, notably shrinking to nine hours in November and sinking to a mere eight hours by December. This rhythmic dance of light reflects the cyclical nature of seasons, inviting Philadelphians to embrace the bright moments of the year while anticipating the return of longer days.
In January, Philadelphia experiences an average wind speed of 2.6 m/s (6 mph), which sets a calm tone for the start of the year. As the month transitions into February, there's a slight increase to 3.2 m/s (7 mph), signaling a subtle ramp-up as winter continues. However, by March, winds pick up noticeably, peaking at 4.0 m/s (9 mph), ushering in the early signs of spring with a brisk breeze. Interestingly, April and May see a return to more moderate winds, stabilizing at 3.0 m/s (7 mph), maintaining a refreshing atmosphere as flowers bloom. The summer months of June and July bring a gentle reprieve, with wind speeds dropping back to 2.6 m/s (6 mph), creating a soothing environment ideal for outdoor activities. As autumn approaches, wind speeds gradually climb again, particularly in November, reaching 3.3 m/s (7 mph), and concluding with a brisker 3.7 m/s (8 mph) in December. This cyclical pattern illustrates Philadelphia's dynamic wind dynamics, which not only reflects seasonal changes but also enhances the city's unique charm throughout the year.
The weather in Philadelphia changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of January's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Philadelphia and find detailed weather information for every month.
January and February present a stark yet gradual shift in winter weather, marked by slightly milder temperatures in February. In January, the minimum temperature can plunge to a chilling -33°C (-27°F), with an average of -6°C (22°F) and a maximum of 14°C (58°F). In contrast, February experiences milder conditions, with minimum temperatures around -27°C (-16°F), average temperatures of -4°C (25°F), and a maximum reaching 15°C (60°F). Precipitation levels remain consistent, with both months receiving around 86 mm (3.4 in) and 84 mm (3.3 in) respectively, while humidity stays constant at an average of 93%. For those interested in weather specifics, you can explore more about Philadelphia weather in February.
In January, the weather is characterized by extremely low temperatures, with a minimum of -33°C (-27°F) and an average of -6°C (22°F), while the maximum reaches 14°C (58°F). This month experiences significant precipitation totaling 86 mm (3.4 in) over 12 days, alongside high humidity levels at 93%.
In contrast, March shows a notable warming trend, with minimum temperatures at -22°C (-7°F), an average of 0°C (32°F), and a maximum of 21°C (70°F). Precipitation is slightly higher at 88 mm (3.5 in) but remains consistent, occurring over the same 12 days. The humidity decreases to 86%, reflecting the transition towards spring. For more details on what to expect, you can check out Philadelphia weather in March.
January and April present markedly different weather patterns. In January, temperatures reach a minimum of -33°C (-27°F) and average around -6°C (22°F), with a maximum of 14°C (58°F), creating a frigid midwinter ambiance. The month experiences significant precipitation of 86 mm (3.4 in) over 12 days, coupled with high humidity at 93%, which can contribute to a damp, chilly feel. In contrast, April brings a much milder climate with minimum temperatures around -7°C (19°F) and averages rising to 7°C (44°F), peaking at a warm 30°C (86°F). This month sees increased precipitation at 130 mm (5.1 in) over 14 days, albeit with slightly lower humidity at 82%, offering a refreshing spring environment. For more details on April conditions, you can check Philadelphia weather in April.
In January, the weather is characterized by frigid temperatures, with a minimum of -33°C (-27°F) and an average of -6°C (22°F), creating a stark contrast to the warmth of May, where temperatures range from a minimum of -2°C (29°F) to a comfortable average of 14°C (57°F) and can reach a maximum of 32°C (90°F). Precipitation is fairly common in both months, with January receiving 86 mm (3.4 in) over 12 days and May slightly higher at 104 mm (4.1 in) over 13 days. Additionally, humidity levels are notably higher in January at 93%, compared to a more moderate 75% in May, reflecting the seasonal transition from the depths of winter to the onset of spring. For a closer look at how May weather unfolds, you can check out Philadelphia weather in May.
January and June exhibit stark contrasts in weather conditions. In January, temperatures plummet, with minimums reaching as low as -33°C (-27°F) and average highs around -6°C (22°F). The month is characterized by high humidity at 93% and considerable precipitation, totaling 86 mm (3.4 inches) over about 12 days. Conversely, June emerges with a much milder climate, boasting minimum temperatures of 3°C (38°F) and an average of 19°C (66°F), peaking at 32°C (90°F). While the precipitation increases slightly to 104 mm (4.1 inches), it occurs over 13 days, accompanied by lower humidity levels at 68%. For more detailed insights into the warm weather, check out Philadelphia weather in June.
January and July present stark contrasts in weather. In January, temperatures can plummet as low as -33°C (-27°F), with an average of -6°C (22°F), creating a harsh winter climate accompanied by high humidity levels around 93%. Precipitation is relatively moderate, totaling 86 mm (3.4 in) across 12 days. In contrast, July boasts a much milder climate, with minimum temperatures of 9°C (49°F) and average highs reaching 22°C (72°F), peaking at a sizzling 35°C (95°F). Though it has slightly more precipitation at 137 mm (5.4 in) over 14 days, the humidity drops to a more comfortable 69%. For a closer look at similar weather patterns, check out Philadelphia weather in July.
January and August present stark contrasts in weather. January experiences bitterly cold temperatures, with lows plunging to -33°C (-27°F) and an average of -6°C (22°F), while August enjoys a much milder climate with temperatures ranging from a minimum of 7°C (44°F) to a pleasant average of 21°C (70°F). Precipitation is also notable in both months, with January receiving 86 mm (3.4 in) over 12 days and August slightly wetter at 106 mm (4.2 in) across 14 days. Additionally, January's high humidity at 93% creates a damp chill, whereas August's relative humidity of 67% leads to a more comfortable warmth. For more details on the summer climate, you can check Philadelphia weather in August.
In January, temperatures can plunge to a chilling minimum of -33°C (-27°F), with an average hovering around -6°C (22°F) and a mild maximum of 14°C (58°F). The month experiences significant humidity at 93%, along with 86 mm (3.4 in) of precipitation over 12 days. In contrast, September brings a much warmer minimum of 0°C (33°F) and an average temperature of 17°C (62°F), peaking at a comfortable 32°C (89°F). Precipitation is slightly less at 75 mm (3.0 in) over just 9 days, and humidity drops to 72%, providing a more pleasant atmosphere. For those interested in detailed weather patterns, check out Philadelphia weather in September.
January and October present striking contrasts in weather. In January, temperatures plunge with a minimum of -33°C (-27°F) and an average of -6°C (22°F), while October enjoys much milder conditions, with a minimum of -3°C (26°F) and an average of 11°C (52°F). Additionally, October sees higher maximum temperatures, reaching up to 26°C (80°F) compared to January's peak of 14°C (58°F). Precipitation also varies, with January receiving 86 mm (3.4 in) over 12 days and October accumulating 160 mm (6.3 in) over 14 days, although October boasts slightly lower humidity at 83% compared to January's 93%. For more specific insights about weather during this time, check out Philadelphia weather in October.
In January, temperatures can plummet to a chilling minimum of -33°C (-27°F), with an average of -6°C (22°F) and occasional highs reaching 14°C (58°F). The month is marked by high humidity levels at 93% and precipitation occurring over roughly 12 days, totaling 86 mm (3.4 in). In contrast, November experiences milder weather, with minimum temperatures around -15°C (6°F) and an average of 3°C (37°F), peaking at 22°C (73°F). While November sees slightly more precipitation at 119 mm (4.7 in) over 14 days, humidity remains lower at 88%. For more detailed insights on November weather, you can explore Philadelphia weather in November.
January weather tends to be slightly colder than December, with average temperatures reaching a low of -6°C (22°F) compared to December's average of -2°C (28°F). January also experiences more extreme lows, dipping to -33°C (-27°F), while December's minimum temperature is a milder -27°C (-17°F). Precipitation is somewhat lower in January at 86 mm (3.4 in) over 12 days, compared to December's 98 mm (3.8 in) across 13 days. Humidity levels are slightly higher in January at 93%, compared to December's 89%. For more detailed insights into the winter weather in the region, visit Philadelphia weather in December.
January in Philadelphia stands out with its chilly temperatures and heightened humidity, making it one of the colder months of the year. The city's weather is characterized by a significant drop from the mild temperatures experienced in fall and a stark contrast to the warming trends of spring. With frequent precipitation and a notable number of damp days, January can feel quite dreary compared to the more stable and vibrant weather of other months. Despite these bleak conditions, it’s an essential time for the region, as it underscores Philadelphia's diverse climate patterns. For more insights on the city's overall climate trends, visit Philadelphia Climate.